CN104577694A - Laser processing device, laser processing method and laser display light source - Google Patents
Laser processing device, laser processing method and laser display light source Download PDFInfo
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Abstract
The embodiment of the invention discloses a laser processing device, a laser processing method and a laser display light source and relates to the field of laser techniques. The laser processing device, the laser processing method and the laser display light source aim to solve the problem of unstable power of frequency multiplication light output by a laser unit in the prior art. A laser display terminal comprises a pump light emitter, the laser processing device and a display screen, the pump light emitter outputs pump light, lasers are output and used for displaying video images on the display screen after the pump light passes through the laser processing device, the laser processing device comprises a first cavity mirror and at least one second cavity mirror, the first cavity mirror is used for transmitting a part of fundamental frequency light, each second cavity mirror is used for transmitting a part of the fundamental frequency light and arranged between the first cavity mirror and a laser crystal, longitudinal mode selection of the fundamental frequency light is further achieved, the amount of the fundamental frequency light in a resonant cavity is greatly reduced, fundamental frequency light of a single longitudinal mode can be obtained, the green problem is relieved, and power stability of frequency multiplication light output is improved.
Description
The application is the denomination of invention proposed on April 16th, 2010 is the divisional application of the Chinese invention patent application CN201080066241.6 (PCT/CN2010/071842) of " a kind of laser generator and method ".
Technical field
The present invention relates to laser technology, particularly a kind of laser machining device, method and laser display light source.
Background technology
Laser has that monochromaticjty is good, high directivity, brightness high.The core of laser technology is laser, and the kind of laser is a lot, can classify by the distinct methods such as operation material, operation wavelength.
Nowadays, laser technology has started to have found application in TV, micro projection, commercialization and entertainment systems.The Laser output that laser freuqency doubling technology then makes existing laser frequency obtain significantly to expand, not only achieve the Laser output of visible light wave range, utilize frequency tripling especially, quadruple technology achieves ultraviolet band.Laser display technology is a main application direction of laser, and it has the features such as large colour gamut, low energy consumption, is considered to main flow Display Technique of future generation.
In following document: CN200710120665.6, CN 200520073932.5, more information relevant to technique scheme can also be found.
But, exist in the prior art, laser is when exporting double-frequency laser, occur the phenomenon of the power output instability of double-frequency laser, even power fluctuation is larger, mainly because the fundamental frequency light of different frequency is when frequency multiplication, because the mutual saturation effect between pattern causes the competition of the fundamental frequency light between different frequency, cause fundamental frequency light gain intensity when gain to change, the power output of frequency doubled light is fluctuated, i.e. so-called green problem.
Can be solved by the length changing mirror chamber in prior art, such as increase the length in mirror chamber to increase longitudinal mode number, or the length in shortening mirror chamber is to reduce longitudinal mode number, but, above-mentioned long mirror cell method and short mirror cell method define the mirror cavity length of laser all too much, bring a lot of restriction to the design of laser; Self-stabilization Systematical control can also be adopted in prior art to export, but this method increase the production cost of laser.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of laser machining device, laser display light source and laser processing method, for realizing the double-frequency laser of stable output power.
On the one hand, in one embodiment, provide a kind of laser machining device, laser machining device comprises:
Chamber, the input of described chamber receives pump light; Arrange laser crystal, wavelength conversion unit in described chamber, described laser crystal generates fundamental frequency light after pump light excites, and described fundamental frequency light is carried out Output of laser after wavelength convert by described wavelength conversion unit;
Arrange the first chamber mirror between described laser crystal and wavelength conversion unit, described first chamber mirror is used for fractional transmission fundamental frequency light;
The input of described chamber to the transmission of described pump light height, to described fundamental frequency light high reverse--bias, and/or to described laser high reverse--bias;
The output of described chamber is to described fundamental frequency light high reverse--bias and/or to the transmission of described laser height.
This laser machining device possesses following beneficial effect:
The first chamber mirror in laser machining device, to fundamental frequency light fractional transmission, input coupling mirror and output coupling mirror are to fundamental frequency light high reverse--bias, thus the mirror chamber between input coupling mirror and the first chamber mirror and the mirror chamber between described output coupling mirror and described first chamber mirror form the stationary field of described fundamental frequency light, due to the interaction between multiple stationary field, increase the wavelength interval of fundamental frequency light, the relative light intensity of the fundamental frequency light after gain is that the relative light intensity of the fundamental frequency light of this wavelength and working-laser material are to the product of the gain intensity of this fundamental frequency light, achieve further to the longitudinal mode selection of fundamental frequency light, greatly reduce the quantity of fundamental frequency light longitudinal mode in resonant cavity, and the fundamental frequency light of single longitudinal mode can be obtained, thus alleviate green problem, improve the power stability exporting frequency doubled light.
Further, on the basis of above-mentioned laser machining device, additionally provide a kind of laser machining device, the first chamber mirror in this laser machining device comprises:
Add the convex lens of partial light permeability film or coating, concavees lens, level crossing, post lens or aspherical mirror.
This laser machining device possesses following beneficial effect:
First chamber mirror can select to add the convex lens of partial light permeability film or coating, concavees lens, level crossing, post lens or aspherical mirror, the model of the first chamber mirror can be selected, to meet the requirement under different capacity and wave band according to the beam diameter of required fundamental frequency light.
Further, on the basis of above-mentioned laser machining device, additionally provide a kind of laser machining device, in this laser machining device:
Described wavelength conversion unit be 1 or 2 and above with frequency crystal, 1 and above frequency-doubling crystal or 1 and above with frequency crystal and the combination of 1 and above frequency-doubling crystal.
This laser machining device possesses following beneficial effect:
Laser machining device is by frequency-doubling crystal and the various combinations with frequency crystal, not only can obtain the frequency doubled light of stable output power, the frequency tripling light of stable output power and the laser of higher frequency multiplication can be obtained, be conducive to the purposes and the function that expand this laser machining device, improve the scope of application of this laser machining device.
Further, on the basis of above-mentioned laser machining device, additionally provide a kind of laser machining device, in this laser machining device, described wavelength conversion unit frequency-doubling crystal comprises:
KTP ktp crystal, three lithium borate lbo crystals, barium metaborate bbo crystal, bismuth boracic acid BIBO crystal, phosphoric acid-oxygen-titanium rubidium RTP crystal, arsenic acid titanyl potassium KTA crystal, potassium dihydrogen phosphate KDP crystal, periodic polarized lithium niobate PPLN crystal and/or period polarized KTP PPKTP crystal.
This laser machining device possesses following beneficial effect:
Wavelength conversion unit can use above-mentioned various frequency-doubling crystal, this laser machining device can select various different frequency-doubling crystal flexibly, to obtain the double-frequency laser of required frequency, comprise the laser of double-frequency laser, frequency tripled laser and more multiple frequence, be conducive to the generation manufacture of this wavelength conversion unit, reduce the cost of this laser machining device.
Further, on the basis of above-mentioned laser machining device, additionally provide a kind of laser machining device, also comprise in this laser machining device:
Optical lens, is arranged between described first chamber mirror and described laser crystal, and/or is arranged between described first chamber mirror and described wavelength conversion unit, for increasing or reduce the beam diameter of described laser.
This laser machining device possesses following beneficial effect:
By arranging optical lens between intermediate cavity mirror and described laser crystal, fundamental frequency light beam diameter can be changed further, by arranging optical lens between described intermediate cavity mirror and described frequency-doubling crystal, to change the beam diameter of frequency doubled light further, improve the quality of fundamental frequency light or frequency doubled light.
Further, on the basis of above-mentioned laser machining device, additionally provide a kind of laser machining device, also comprise in this laser machining device:
Second chamber mirror, fractional transmission fundamental frequency light, described second chamber mirror is at least a slice, is arranged between described first chamber mirror and described laser crystal.
This laser machining device possesses following beneficial effect:
Not only can change the beam diameter of fundamental frequency light further, and another stationary field can also be formed between intermediate cavity mirror, further reduce noise fundamental frequency light, thus improve the efficiency selecting single longitudinal mode fundamental frequency light and the beam quality improving fundamental frequency light.
On the other hand, in one embodiment, provide a kind of laser display light source, this laser display light source comprises: the pump light reflector exporting pump light, also comprises any one above-mentioned laser machining device.
This laser display light source possesses following beneficial effect:
By adopting above-mentioned any one laser display light source, achieve further to the longitudinal mode selection of fundamental frequency light, greatly reduce the quantity of fundamental frequency light longitudinal mode in resonant cavity, the fundamental frequency light of single longitudinal mode can be obtained, thus alleviate green problem, improve the power stability exporting frequency doubled light or multiple frequence light, and frequency doubled light and the multiple frequence light of various diameter can be obtained.
On the other hand, provide a kind of laser processing method, comprising: receive pump light; Excite pumping photogenerated fundamental frequency light; Wherein, described method also comprises:
Fractional transmission fundamental frequency light;
By the fundamental frequency light wavelength convert Output of laser after fractional transmission;
The receiving terminal of described pump light to the transmission of described pump light height, to described fundamental frequency light high reverse--bias, and/or to described laser high reverse--bias;
The output of described laser is to described fundamental frequency light high reverse--bias and/or to the transmission of described laser height.
The embodiment of the present invention is by reflecting fundamental frequency light fractional transmission and part, to form the stationary field of multiple fundamental frequency light, due to the interaction between multiple stationary field, increase the wavelength interval of fundamental frequency light, the relative light intensity of the fundamental frequency light after gain is that the relative light intensity of the fundamental frequency light of this wavelength and working-laser material are to the product of the gain intensity of this fundamental frequency light, achieve further to the longitudinal mode selection of fundamental frequency light, greatly reduce the quantity of fundamental frequency light longitudinal mode in resonant cavity, and the fundamental frequency light of single longitudinal mode can be obtained, thus alleviate green problem, improve the power stability exporting frequency doubled light.
Further, on the basis of above-mentioned laser processing method, additionally provide a kind of laser processing method, wherein, described fractional transmission fundamental frequency light by the convex lens of blooming or coating, concavees lens, level crossing, post lens or aspherical mirror to described fundamental frequency light fractional transmission.
This laser processing method possesses following beneficial effect:
By the convex lens of blooming or coating, concavees lens, level crossing, post lens or aspherical mirror to described fundamental frequency light fractional transmission, the model of the first chamber mirror can be selected, to meet the requirement under different capacity and wave band according to the beam diameter of required fundamental frequency light.
Further, on the basis of above-mentioned laser processing method, additionally provide a kind of laser processing method, described by filter after fundamental frequency light wavelength convert Output of laser comprise:
Arrange 1 or 2 and above with frequency crystal, one and above frequency-doubling crystal or one and above with frequency crystal and the combination of and above frequency-doubling crystal wavelength convert is carried out to described fundamental frequency light.
By frequency-doubling crystal and the various combinations with frequency crystal, not only can obtain the frequency doubled light of stable output power, the frequency tripling light of stable output power and the laser of higher frequency multiplication can be obtained, be conducive to the purposes and the function that expand this laser machining device, improve the scope of application of this laser machining device.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the structural representation of laser machining device in the embodiment of the present invention;
Fig. 2 is the relative light intensity figure of fundamental frequency light in stationary field 1 in the embodiment of the present invention;
Fig. 3 is the relative light intensity figure of fundamental frequency light in stationary field 2 in the embodiment of the present invention;
Fig. 4 is the graph of a relation of fundamental frequency light and its gain intensity in the embodiment of the present invention;
Fig. 5 is the relative light intensity figure of the fundamental frequency light in the embodiment of the present invention after gain;
Fig. 6 is the structural representation of laser machining device in another embodiment of the present invention;
Fig. 7 is the relative light intensity figure of fundamental frequency light in stationary field 3 in another embodiment of the present invention;
Fig. 8 is the relative light intensity figure of fundamental frequency light in stationary field 4 in another embodiment of the present invention;
Fig. 9 is the gain intensity of fundamental frequency light in another embodiment of the present invention;
Figure 10 is the relative light intensity figure of the fundamental frequency light in another embodiment of the present invention after gain;
Figure 11 is the structural representation of laser machining device in another embodiment of the present invention;
Figure 12 is the structural representation of laser machining device in another embodiment of the present invention;
Figure 13 is the relative light intensity figure of fundamental frequency light in stationary field 8 in another embodiment of the present invention;
Figure 14 is the relative light intensity figure of fundamental frequency light in stationary field 9 in another embodiment of the present invention;
Figure 15 is the gain intensity curve of fundamental frequency light in another embodiment of the present invention;
Figure 16 is the relative light intensity figure of the fundamental frequency light in another embodiment of the present invention after gain;
Figure 17 is the structural representation of laser machining device in another embodiment of the present invention;
The structural representation of laser display light source in Figure 18 embodiment of the present invention;
Figure 19 is the flow chart of embodiment of the present invention laser processing method.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is done and describes in detail further.
Fig. 1 is the structural representation of laser machining device in the embodiment of the present invention.As shown in Figure 1, the laser machining device of the embodiment of the present invention can comprise:
Chamber, the input of chamber receives pump light, and chamber arranges laser crystal 103 and wavelength conversion unit, and pump light is excited rear generation fundamental frequency light by laser crystal 103, described fundamental frequency light is carried out Output of laser after wavelength convert by wavelength conversion unit, and wavelength conversion unit can be frequency-doubling crystal 105.
Laser crystal 103 in chamber and between wavelength conversion unit, the first chamber mirror 104 is set, for carrying out high reverse--bias to frequency doubled light or multiple frequence light, and part reflection is carried out to fundamental frequency light, the stationary field of described fundamental frequency light is formed with the mirror chamber 1 respectively between input coupling mirror 102 and the first chamber mirror 104 and the mirror chamber 2 between output coupling mirror 106 and the first chamber mirror 104;
The input of chamber can be input coupling mirror 102, and the output of chamber can be output coupling mirror 106;
Further, also comprise sealing shell, for chamber enclosed package input coupling mirror 102, laser crystal 103, first chamber mirror 104, frequency-doubling crystal 105 and output coupling mirror 106 formed;
In an embodiment, pump arrangement 101 adopts the laser diode of the pump light producing 808nm as pump arrangement, and the pump light that pump arrangement 101 produces also can include the noise pump light of other frequency usually;
Pump light enters laser crystal through the input coupled lens 102 of chamber, can plate one deck in the side that input coupling mirror 102 is adjacent with pump arrangement 101 can to pump light height transmission (the High Transmission of 808nm, HT) optical medium, and plate the pump light antireflection (Anti-Reflection of one deck to 808nm at the opposite side of input coupling mirror 102, AR) with fundamental frequency light and frequency doubled light high reverse--bias (High Reflectance, HR) optical medium, above-mentioned optical media player can be one deck optical medium, also the optical media player of multiple sublayer can be comprised,
Spontaneous radiation and stimulated radiation is there is in laser crystal 103 after adopting the pump light of the YVO4 absorption of crystal 808nm of 5mm doping 0.8%Nd ion, output wavelength is the fundamental frequency light of 1064nm, this fundamental frequency light passes through the reflection between input coupling mirror 102 and output coupling mirror 106 and by laser crystal 103 oscillator gain repeatedly, gain is the light beam of fundamental frequency light gradually;
Frequency-doubling crystal 105 adopts the ktp crystal of 10mm, and the fundamental frequency light frequency multiplication of 1064nm is excited the frequency doubled light into 532nm;
One deck is plated to fundamental frequency light high reverse--bias HR and the optical medium to frequency doubled light height transmission HT in the side that output coupling mirror 106 is adjacent with the first chamber mirror 104, all frequency multiplication is sent through frequency-doubling crystal to make fundamental frequency light, and the timely transmission of frequency doubled light is gone out, reduce the loss of fundamental frequency light and frequency doubled light;
Space between first chamber mirror 104 and input coupling mirror 102 is mirror chamber 1, space between first chamber mirror 104 and output coupling mirror 106 is mirror chamber 2, the length in mirror chamber 1 and mirror chamber 2 is respectively L1 and L2, L1 and L2 is adjusted according to formula (1), to regulate the frequency interval of the fundamental frequency light of vibration, formula (1) is as follows:
=m*c/(2nL) m=1,2,3…… (1)
Wherein,
for the frequency of the fundamental frequency light of stationary field, c is the light velocity in vacuum, and n is the refractive index of mirror intracavity gas, and L is the length in mirror chamber, and the fundamental frequency light not meeting other frequency of formula (1) will be consumed gradually in mirror chamber 1 and mirror chamber 2.
In actual applications, laser crystal can be calculated by formula (2) the relation between the gain intensity of fundamental frequency light and the frequency of fundamental frequency light, and formula (2) is as follows:
(2)
for frequency is
the gain intensity of fundamental frequency light,
for gain bandwidth,
for the centre frequency of the fundamental frequency light of gain, often kind of laser crystal has its distinctive gain centre frequency, and gain frequency is the median of gain curve, is also the frequency of the maximum fundamental frequency light of gain intensity;
The wavelength of fundamental frequency light is 1064nm, wavelength components transmission (the Part Transmission of one deck to fundamental frequency light 1064nm is plated in two sides of the first chamber mirror 104, PT) and to wavelength be the optical medium of the frequency doubled light high reverse--bias of 532nm, the transmissivity of the wavelength components transmission of the first chamber mirror 104 couples of fundamental frequency light 1064nm can be arranged according to actual conditions, be as the criterion with the condition of the stationary field of satisfied formation fundamental frequency light, such as can transmitance be arranged between 5-50%, to form stationary field 1 and the stationary field 2 of wideband fundamental frequency light in mirror chamber 1 and mirror chamber 2 respectively,
In an embodiment, input coupling mirror 101 and output coupling mirror 106 adopt level crossing, first chamber mirror 104 adopts convex lens, focal length is 25mm, in the present embodiment, first chamber mirror 104 can not only carry out fractional transmission to fundamental frequency light, and can also change by the beam diameter of the fundamental frequency light of laser crystal oscillator gain; In actual applications, first chamber mirror 104 can also change the parameters such as the beam diameter of fundamental frequency light by adopting convex lens or concavees lens, first chamber mirror can also be add the level crossing of partial light permeability film or coating, concave mirror, convex mirror and various aspherical mirror, as long as the first chamber mirror of above-mentioned model possesses the function to fundamental frequency light fractional transmission, at least two stationary fields can be realized.
In an embodiment, setting L1 is 64.5mm, L2 is set as 29mm, Fig. 2 is the relative light intensity figure of fundamental frequency light in stationary field 1 in the embodiment of the present invention, Fig. 3 is the relative light intensity figure of fundamental frequency light in stationary field 2 in the embodiment of the present invention, the relative light intensity of the fundamental frequency light of stationary field 1 and stationary field 2 respectively as shown in Figures 2 and 3, in the length in mirror chamber and stationary field fundamental frequency light wavelength between relation can be calculated by prior art, do not repeat them here.Fig. 4 is the graph of a relation of fundamental frequency light and its gain intensity in the embodiment of the present invention, in stationary field 1 and stationary field 2, the fundamental frequency light of phase co-wavelength obtains gain by according to gain intensity as shown in Figure 4 in laser crystal 102, the gain intensity curve of fundamental frequency light is Lorentz curve, and Fig. 5 is the relative light intensity figure of the fundamental frequency light in the embodiment of the present invention after gain.As shown in Figure 5, stationary field 1 fundamental frequency light identical with stationary field 2 medium wavelength is by laser crystal 102 gain, the relative light intensity of the fundamental frequency light after gain is the relative light intensity of this wavelength in stationary field 1, the product of the relative light intensity in stationary field 2 and gain intensity three, because the frequency interval of the fundamental frequency light in whole resonant cavity increases, make the fundamental frequency light quantity that the wavelength in stationary field 1 and stationary field 2 is equal little, and, because the gain intensity of laser crystal to the fundamental frequency light of different wave length meets Lorentz curve, so, usually only have the fundamental frequency light at gain center could by high-gain, the fundamental frequency light of other wavelength will be consumed, thus select the fundamental frequency light of single longitudinal mode, in Figure 5, wavelength is only had to be that the fundamental frequency light of 1064nm is by high-gain, the fundamental frequency light of this single longitudinal mode is through the frequency multiplication of frequency-doubling crystal 105, owing to only having the fundamental frequency light of single longitudinal mode by frequency multiplication, therefore, avoid green problem, the frequency doubled light of power stability can be obtained, the wavelength of this frequency doubled light is 532nm.
In an embodiment, one piece of optical lens 107 can also be set again between the first chamber mirror 104 and laser crystal 103, Fig. 6 is the structural representation of laser machining device in another embodiment of the present invention, as shown in Figure 6, in this enforcement, frequency-doubling crystal 105 adopts the LBO frequency-doubling crystal of 15mm, laser crystal 103 adopts the GdVO4 crystal of the Nd ion of 5mm doping 1%, the fundamental frequency light high reverse--bias of input coupling mirror 102 couples of 912nm, the fundamental frequency light height transmission of optical lens 107 couples of 912nm, its effect utilizes the character of convex lens to change the character in light transmition direction to change the beam diameter of fundamental frequency light, space between first chamber mirror 104 and input coupling mirror 102 is mirror chamber 3, space between first chamber mirror 104 and output coupling mirror 106 is mirror chamber 4, setting L3 is 148.5mm, L4 is 69.1mm, stationary field 3 and stationary field 4 is formed in mirror chamber 3 and mirror chamber 4, Fig. 7 is the relative light intensity figure of fundamental frequency light in stationary field 3 in another embodiment of the present invention, Fig. 8 is the relative light intensity figure of fundamental frequency light in stationary field 4 in another embodiment of the present invention, as shown in Figure 7 and Figure 8, the fundamental frequency light not meeting other wavelength of formula (1) will be consumed, thus decrease the longitudinal mode number of fundamental frequency light, Fig. 9 is the gain intensity of fundamental frequency light in another embodiment of the present invention, the fundamental frequency light that stationary field 3 is equal with stationary field 4 medium wavelength is amplified according to gain intensity curve as shown in Figure 9 by laser crystal 103 oscillator gain, as shown in Figure 9, owing to have employed the high loss design of 1064nm, laser crystal 103 pairs of wavelength are that the gain intensity of the fundamental frequency light of 912nm is the highest, Figure 10 is the relative light intensity figure of the fundamental frequency light in another embodiment of the present invention after gain, as shown in Figure 10, wavelength is that the gain intensity of the fundamental frequency light of 912nm is maximum, the wavelength of this single longitudinal mode is the frequency multiplication of fundamental frequency light through frequency-doubling crystal 105 of 912nm, thus acquisition wavelength is the laser beam of 456nm, in the present embodiment, be that the single longitudinal mode fundamental frequency light of 912nm is by frequency multiplication owing to only having wavelength, avoid green problem, thus the frequency doubled light of power stability can be obtained,
In an embodiment, above-mentioned optical lens 107 can be replaced to the second chamber mirror 104
/, Figure 11 is the structural representation of laser machining device in another embodiment of the present invention.As shown in figure 11, wavelength conversion unit comprises the first chamber mirror 104 and the second chamber mirror 104
/, the second chamber mirror 104
/as the first chamber mirror 104 pairs of fundamental frequency light, fractional transmission is carried out to fundamental frequency light, to frequency doubled light and pump light high reverse--bias, due to the first chamber mirror 104
/to fundamental frequency light fractional transmission and part reflection, therefore, can at the second chamber mirror 104
/form stationary field 7 with the mirror chamber 7 that the first chamber mirror 104 is formed, the length in mirror chamber 7 is L7, L7=44.55mm, and the fundamental frequency light forming standing wave in stationary field 7 meets formula (1), the second chamber mirror 104
/and form mirror chamber 5 between input coupling mirror, length is L5, L5=93.95mm, the stationary field 5 of the fundamental frequency light formation meeting formula (1) is there is in mirror chamber 5, mirror chamber 6 is formed between first chamber mirror 104 and output coupling mirror 106, length is L6, still for there is the stationary field 6 of the fundamental frequency light formation meeting formula (1) in 69.1mm mirror chamber 6 in L6, stationary field 5, in stationary field 6 and stationary field 7, the fundamental frequency light of same frequency carries out gain by by laser crystal according to gain intensity curve as shown in Figure 9, thus the fundamental frequency light only having a longitudinal mode obtained as shown in Figure 10, in the present embodiment, second chamber mirror 104
/be as the criterion to form stable stationary field in mirror chamber 5, mirror chamber 6 and mirror chamber 7 with the partial reflectance of the first chamber mirror 104 pairs of fundamental frequency light, stationary field 5 is identical with the relative light intensity figure of the fundamental frequency light in stationary field 3 with the relative light intensity figure of fundamental frequency light in stationary field 7, the relative light intensity figure of the fundamental frequency light in stationary field 6 is identical with the relative light intensity figure of fundamental frequency light in stationary field 4, does not repeat them here.
In an embodiment, as shown in figure 12, arrange between frequency-doubling crystal 105 and output coupling mirror 106 one piece with frequency-doubling crystal 105 with the use of with frequency crystal 105
/, to generate frequency tripling light, Figure 12 is the structural representation of laser machining device in another embodiment of the present invention, and as shown in figure 12, wavelength conversion unit comprises frequency-doubling crystal 105 and mates and frequency crystal 105
/, frequency-doubling crystal 105 and coupling and frequency crystal 105
/adopt the lbo crystal of the 10mm of I class and II type-Ⅱphase matching respectively, laser crystal adopts the YVO4 crystal of the Nd ion of 12mm doping 0.6%, wherein the first chamber mirror 104 plates the optical medium of one deck to 532nm and 355nm high reverse--bias and the fundamental frequency light fractional transmission to 1064nm, space between input coupling mirror 102 and the first chamber mirror 104 is mirror chamber 8, the length L8 in mirror chamber 8 is 75mm, space between output coupling mirror 106 and the first chamber mirror 104 is mirror chamber 9, the length L9 in mirror chamber 9 is 39mm, stationary field 8 and stationary field 9 is formed respectively in mirror chamber 8 and mirror chamber 9, Figure 13 is the relative light intensity figure of fundamental frequency light in stationary field 8 in another embodiment of the present invention, Figure 14 is the relative light intensity figure of fundamental frequency light in stationary field 9 in another embodiment of the present invention, wherein, stationary field 8 as shown in figure 13, stationary field 9 as shown in figure 14, Figure 15 is the gain intensity curve of fundamental frequency light in another embodiment of the present invention, in stationary field 8 and stationary field 9 fundamental frequency light of phase co-wavelength according to gain intensity curve as shown in figure 15 by laser crystal 103 gain, the relative light intensity of the fundamental frequency light after gain is the relative light intensity of this wavelength in stationary field 8, the product of the relative light intensity in stationary field 9 and gain intensity three, thus in whole resonant cavity, obtain the fundamental frequency light of single longitudinal mode as shown in figure 16, Figure 16 is the relative light intensity figure of the fundamental frequency light in another embodiment of the present invention after gain, the fundamental frequency light of this single longitudinal mode is through frequency-doubling crystal 105 and and frequency crystal 105
/excited by frequency tripling afterwards, obtain the frequency tripled laser that wavelength is 355nm, change kind or the quantity of frequency-doubling crystal, multiple frequence light can also be obtained, comprise the multiple frequence light of quadruple frequency light, fifth harmonic light and above multiple.
In an embodiment, by laser crystal 103 and input coupling mirror 102 integral production, by frequency-doubling crystal 105 and output coupling mirror 106 integral production, Figure 17 is the structural representation of laser machining device in another embodiment of the present invention, as shown in figure 17, wherein, first 104 pairs, chamber mirror fundamental frequency light fractional transmission, input coupling mirror 102 and output coupling mirror 106 fundamental frequency light high reverse--bias, the stationary field of fundamental frequency light is formed with the mirror chamber 10 between the first chamber mirror 104 and input coupling mirror 102, and the mirror chamber 11 between the first chamber mirror 104 and output coupling mirror 106 forms the stationary field of fundamental frequency light, in order to reduce the loss of laser machining device to pump light and frequency doubled light or multiple frequence light, usually the optical medium of one deck to fundamental frequency light high reverse--bias is plated at input coupling mirror 102, the optical medium of one deck to frequency doubled light or the transmission of multiple frequence light height is plated at output coupling mirror 106, to make, the laser beam after frequency multiplication is high efficiency to be launched,
Further, directly can plate the optical medium of one deck to fundamental frequency light high reverse--bias and to the transmission of pump light height in the side that laser crystal 103 is adjacent with pump arrangement 101, plate the optical medium of one deck to fundamental frequency light high reverse--bias and to frequency doubled light or the transmission of multiple frequence light height in the side of the output of frequency-doubling crystal 105, thus reduce the loss of fundamental frequency light and the production cost of laser machining device.
Further, wavelength conversion unit can also be 1 or 2 and combination that is above and frequency crystal, or be the combination of 1 and above frequency-doubling crystal, or 1 and above with frequency crystal and the combination of 1 and above frequency-doubling crystal, select combination according to the frequency of required frequency doubled light and power.
In the various embodiments described above, the fractional transmission of the first chamber mirror can be realized by the coating technique of optical medium of the prior art, does not repeat them here; The frequency doubled light that can generate according to actual needs is to select corresponding wavelength conversion unit, except above-mentioned KTP ktp crystal and three lithium borate lbo crystals, wavelength conversion unit can also select the periodical poled crystals such as barium metaborate bbo crystal, bismuth boracic acid BIBO crystal, phosphoric acid-oxygen-titanium rubidium RTP crystal, arsenic acid titanyl potassium KTA crystal, potassium dihydrogen phosphate KDP crystal, periodic polarized lithium niobate PPLN crystal and period polarized KTP PPKTP crystal, by arranging different crystal types and quantity obtains corresponding frequency doubled light or multiple frequence light.
Comprehensive above-described embodiment is known, in an embodiment of the present invention, by plating the optical medium of one deck to fundamental frequency light fractional transmission on the first chamber mirror, make fundamental frequency light in the mirror chamber of the first mirror both sides, chamber on formed respectively and comprise the stationary field of the fundamental frequency light of multi-wavelength, after laser machining device each chamber mirror length and lens curvature being determined according to design object, according to the length in formula (1) trickle adjustment each mirror chamber to obtain the stationary field comprising required wavelength, the fundamental frequency light that each stationary field medium wavelength is all equal will by laser crystal according to gain intensity curve oscillator gain, usually the fundamental frequency light of single-frequency can be obtained in whole resonant cavity, the fundamental frequency light of this single-frequency obtains the frequency doubled light of power stability after frequency-doubling crystal frequency multiplication, the embodiment of the present invention improves the power stability of frequency doubled light or multiple frequence light, and do not need to do too many change to existing laser machining device.
Figure 18 is the structural representation of embodiment of the present invention laser display light source, as shown in figure 18, laser display light source in the embodiment of the present invention comprises pump light reflector 101 and laser machining device, pump light reflector is for exporting pump light, laser machining device adopts structure as shown in Figure 1, laser machining device can also to adopt in above-described embodiment other structure, does not repeat them here.
Further, laser display light source in the embodiment of the present invention can be applied in the laser display terminals such as laser display TV, laser display TV comprises pump light reflector, laser machining device and display screen, pump light reflector in laser display TV exports pump light, the input coupled lens 102 of laser machining device middle chamber receives pump light, pump light is absorbed rear generation spontaneous radiation and stimulated radiation by laser crystal 103, export fundamental frequency light, this fundamental frequency light through input coupling mirror 102 and output coupling mirror 106 between reflection and by laser crystal 103 oscillator gain repeatedly, gain is the light beam of fundamental frequency light gradually, space between first chamber mirror 104 and input coupling mirror 102 is mirror chamber 1, space between first chamber mirror 104 and output coupling mirror 106 is mirror chamber 2, the transmissivity of the first chamber mirror 104 pairs of fundamental frequency light fractional transmission can be arranged according to actual conditions, be as the criterion with the condition of the stationary field of satisfied formation fundamental frequency light, to form stationary field 1 and the stationary field 2 of wideband fundamental frequency light in mirror chamber 1 and mirror chamber 2 respectively, as shown in Figure 5, stationary field 1 fundamental frequency light identical with stationary field 2 medium wavelength is by laser crystal 102 gain, the relative light intensity of the fundamental frequency light after gain is the relative light intensity of this wavelength in stationary field 1, the product of the relative light intensity in stationary field 2 and gain intensity three, because the frequency interval of the fundamental frequency light in whole resonant cavity increases, make the fundamental frequency light quantity that the wavelength in stationary field 1 and stationary field 2 is equal little, and, because the gain intensity of laser crystal to the fundamental frequency light of different wave length meets Lorentz curve, so, usually only have the fundamental frequency light at gain center could by high-gain, the fundamental frequency light of other wavelength will be consumed, thus select the fundamental frequency light of single longitudinal mode, in Figure 5, wavelength is only had to be that the fundamental frequency light of 1064nm is by high-gain, the fundamental frequency light of this single longitudinal mode is through the frequency multiplication of frequency-doubling crystal 105, owing to only having the fundamental frequency light of single longitudinal mode by frequency multiplication, therefore, avoid green problem, the frequency doubled light of power stability can be obtained, the wavelength of this frequency doubled light is 532nm, the double-frequency laser of this power stability is used for display brightness on a display screen, the video image that definition is stable, improve the display effect of the video image of the laser display terminals such as laser display TV.
Figure 19 is the flow chart of embodiment of the present invention laser processing method.As shown in figure 19, the flow process of laser processing method can comprise the steps:
Step 1901, fractional transmission fundamental frequency light.
In embodiments of the present invention, any one laser machining device above-mentioned can be adopted to realize the method, the technical scheme of the embodiment of the present invention is introduced for laser machining device as shown in Figure 1 at this, the pump light that the receiving terminal of the first chamber mirror 104 pairs of chambers in chamber receives carries out fractional transmission and part reflection, then enters step 1902.
Step 1902, by the fundamental frequency light wavelength convert Output of laser after fractional transmission.
After the pump light that the receiving terminal of the first chamber mirror 104 pairs of chambers receives carries out fractional transmission and part reflection, pump light will form stationary field 1 and the stationary field 2 of wideband fundamental frequency light respectively in mirror chamber 1 and mirror chamber 2, in stationary field 1 and stationary field 2, the fundamental frequency light of phase co-wavelength obtains gain by according to gain intensity as shown in Figure 4 in laser crystal 102, the gain intensity curve of fundamental frequency light is Lorentz curve, because the gain intensity of laser crystal to the fundamental frequency light of different wave length meets Lorentz curve, so, usually only have the fundamental frequency light at gain center could by high-gain, the fundamental frequency light of other wavelength will be consumed, thus select the fundamental frequency light of single longitudinal mode, in Figure 5, only has the fundamental frequency light of single longitudinal mode through the frequency multiplication as the frequency-doubling crystal 105 of wavelength conversion unit, owing to only having the fundamental frequency light of single longitudinal mode by frequency multiplication, therefore, avoid green problem, the laser of power stability can be obtained.
In an embodiment, described fractional transmission fundamental frequency light by the convex lens of blooming or coating, concavees lens, level crossing, post lens or aspherical mirror as the first chamber mirror to fundamental frequency light fractional transmission.
Further, be set to 1 or 2 and combination that is above and frequency crystal, or be the combination of 1 and above frequency-doubling crystal, or 1 and above with frequency crystal and the combination of 1 and above frequency-doubling crystal, select combination according to the frequency of required frequency doubled light and power.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; above-described embodiment is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a laser display terminal, laser display terminal comprises pump light reflector, laser machining device and display screen, described pump light reflector exports pump light, described pump light after described laser machining device Output of laser for display video image on described display screen, it is characterized in that, described laser machining device comprises:
Chamber, the input of described chamber receives described pump light; Arrange laser crystal, wavelength conversion unit in described chamber, pump light is excited rear generation fundamental frequency light by described laser crystal, and described fundamental frequency light is carried out Output of laser after wavelength convert by described wavelength conversion unit;
First chamber mirror, described first chamber mirror is arranged between described laser crystal and wavelength conversion unit, for fractional transmission fundamental frequency light;
Second chamber mirror, described second chamber mirror is arranged between described first chamber mirror and described laser crystal, and for fundamental frequency light described in fractional transmission, described second chamber mirror is at least a slice;
The input of described chamber to the transmission of described pump light height, to described fundamental frequency light high reverse--bias, and/or to described laser high reverse--bias;
The output of described chamber is to described fundamental frequency light high reverse--bias and/or to the transmission of described laser height.
2. laser display terminal according to claim 1, is characterized in that, described first chamber mirror comprises: add the convex lens of partial light permeability film or coating, concavees lens, level crossing, post lens or aspherical mirror.
3. laser display terminal according to claim 1 and 2, it is characterized in that, described wavelength conversion unit be 1 or 2 and above with frequency crystal, 1 and above frequency-doubling crystal or 1 and above with frequency crystal and the combination of 1 and above frequency-doubling crystal.
4. laser display terminal according to claim 3, is characterized in that:
Described wavelength conversion unit comprises:
KTP ktp crystal, three lithium borate lbo crystals, barium metaborate bbo crystal, bismuth boracic acid BIBO crystal, phosphoric acid-oxygen-titanium rubidium RTP crystal, arsenic acid titanyl potassium KTA crystal, potassium dihydrogen phosphate KDP crystal, periodic polarized lithium niobate PPLN crystal and/or period polarized KTP PPKTP crystal.
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| CN201080066241.6A CN102870295B (en) | 2010-04-16 | 2010-04-16 | Laser processing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684691A (en) * | 2015-11-09 | 2017-05-17 | 中国科学院大连化学物理研究所 | Intracavity third harmonic generation composite cavity |
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| US5642375A (en) * | 1995-10-26 | 1997-06-24 | Hewlett-Packard Company | Passively-locked external optical cavity |
| US5854802A (en) * | 1996-06-05 | 1998-12-29 | Jin; Tianfeng | Single longitudinal mode frequency converted laser |
| CN1558263A (en) * | 2004-01-30 | 2004-12-29 | 嘉 郑 | Method for displaying flicker free video image using laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106684691A (en) * | 2015-11-09 | 2017-05-17 | 中国科学院大连化学物理研究所 | Intracavity third harmonic generation composite cavity |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |