CN103682964A - High-power optical fiber laser for anhydrous cooling heat capacity - Google Patents
High-power optical fiber laser for anhydrous cooling heat capacity Download PDFInfo
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- CN103682964A CN103682964A CN201310718940.XA CN201310718940A CN103682964A CN 103682964 A CN103682964 A CN 103682964A CN 201310718940 A CN201310718940 A CN 201310718940A CN 103682964 A CN103682964 A CN 103682964A
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Abstract
The invention relates to a high-power fiber laser for anhydrous cooling heat capacity. Hollow structures, heat-conducting strips, filling phase-change materials and airbags are arranged inside a substrate, wherein the heat-conducting strips adopting a deep groove structure is arranged between the hollow structures, and the resilient airbags are placed under the hollow structures; the phase-change materials in the solid state and the liquid state are different in density; when the phase-change materials change from the solid state to the liquid state in the process of heat absorbing, the volume of the phase-change materials increases, and the airbag is compressed to provide an extra volume; when the phase-change materials change from the liquid state to solid state in the process of heat releasing, the volume of phase-change materials decreases, and the airbag is expanded to compensate the volume loss; in the process of the volume changing of phase-change materials, the volume is buffered to guarantee a good contact between the phase-change materials and a heat-conducting base. When the laser is in operation, the heat is transmitted to phase-change materials through the heat-conducting strips. After reaching the phase-change temperature, the materials change in phase and absorb a large amount of heat, so as to realize the temperature control of a laser cavity and a pump device.
Description
Technical field
The present invention relates to a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser, belong to fiber laser field.
Background technology
With gas or conventional solid state laser, compare, high-capacity optical fiber laser is simple in structure, beam quality is good, conversion efficiency is high, threshold value is low, and is convenient to safeguard, in fields such as communication, printing, mark, materials processing, medical treatment, has a wide range of applications.Nearly ten years, its power output is with the speed increase of 1.7 times every year on average, and the peak power of the simple optical fiber single-mode output of having realized has at present reached 10kW, and multimode laser maximum power output has surpassed 50kW.
Yet when high-capacity optical fiber laser power output significantly promotes, the heat producing on laser cavity and pumping source is also increasing considerably, the rising of device temperature becomes the factor that design need to be considered.The change of working temperature can affect laser power stability, the in the situation that of the large thermal accumlation of small size, even can make device inside structure change, and causes irreversible damage.At present the heat dissipating method of laser mainly contains three kinds, air-cooled, water-cooled and electronic cooling.Air-cooledly by cross-ventilation, directly dispel the heat, apparatus structure is less, but because the air capacity of heat transmission is little, its heat radiation power is also less, is used for the heat radiation of low-power laser.For high power laser, be air-cooledly not enough to take away heat, can only be by water cooling.But water-cooling apparatus is bulky, the several times of laser bodies structure decades of times even often, mobile comparatively inconvenience.The paltie effect of electronic cooling based semiconductor material, makes heat transfer to another surface from a surface, and its small volume refrigerating capacity is moderate, but shortcoming is to need the extra electric drive that supplies, often suitable with main body electric power.Can say that three kinds of temperature control modes that use in conventional laser move and to the conditional use occasion of output power, all have limitation to a certain degree for needs.
On the other hand, when phase-changing energy-storing technology undergoes phase transition by heat-storing material, absorb or emit storage and the release that heat is realized energy, in phase transition process, approach constant temperature, can alleviate energy supply and demand both sides does not mate on time, intensity and place, be the important technical that improves efficiency of energy utilization and energy-saving and emission-reduction, in recent years its research attracted to more and more many concerns.Phase-change material itself has also been carried out widely to research both at home and abroad, developed that multiple phase transformation potential is high, the phase-change material of stable performance.But common pure phase-change material, often only have quite low conductive coefficient (0.1～0.3W/ (m.K)), often need to be attached in heat conduction skeleton structure and use, form whole lower thermal resistance, significantly reduce the temperature of hot side, avoid local overheating situation to occur.
At present, phase change energy storage technology is used for solar water heating system, air-conditioning system and building energy conservation, in the use of laser temperature control field, does not appear in the newspapers.
Summary of the invention
Technology of the present invention is dealt with problems and is: in to the weight of fiber laser and the conditional environment for use of output power tool; overcome the deficiencies in the prior art; a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser solution based on phase-change material heat storage technology and skeleton heat conduction technology is provided; can realize the high power laser light output in the short time, protection laser inherently safe.
Technical solution of the present invention is: a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser, comprise substrate, radiating groove, LD and passive device and optical fiber, substrate top surface has symmetrical a plurality of radiating groove, LD and passive device and optical fiber are placed on substrate, substrate interior is provided with hollow structure, conducting strip, fill phase-change material and air bag, it between hollow structure, is the conducting strip of deep groove structure, the air bag with toughness is placed in the lower end of hollow structure, phase-change material density when solid-state and liquid state is different, phase-change material is in absorbing heat process, by solid, gradually become liquid, the volume of phase-change material increases, now air bag is compressed, additional volumes is provided, phase-change material, in exothermic process, is become solid-stately from liquid state, the volume of phase-change material reduces, and now air bag expands, and fills up Volume Loss.
Described conducting strip and substrate are same structure workpiece or implement good thermo-contact, so that the conduction of heat low thermal resistance.
The shape of described radiating groove matches with the profile that is placed on each parts in radiating groove, in order to increase the area of dissipation of radiating groove sidewall, improves heat transfer efficiency.For optical fiber, be placed on the U-lag, V-shaped groove or the other forms of deep gouge that on substrate, wash out; For as body devices such as pumping LD and bundling devices, be placed on the shallow slot that meets device profile washing out on substrate, increase side area of dissipation.
The present invention's advantage is compared with prior art:
(1) the present invention, without water cooling or the heat radiation of other refrigerant circulations, has reduced refrigerant and laser internal structure has been produced to the potential threat of polluting, and greatly reduced the complexity of cooling system, guarantees the security of operation of laser.
(2) due to heat-storing material temperature in phase transformation generating process can maintain one invariable in more among a small circle, this makes not need temperature to control in the present invention, as long as heat radiation heat is not more than design amount of stored heat, hot-face temperature is relatively stable, and this makes pumping source and laser cavity also can maintain stable operating state.
(3) select to have larger latent heat of phase change and the good phase-change material of thermal conductivity as packing material, can keep that cooling system volume is little, the feature of compact conformation, and then can realize integrated design, there is splendid shock resistance.
(4) phase-change material does not need externally fed in heat-accumulating process, and has restorability, in laser works, can absorb heat and dispel the heat, and after laser quits work, can, by reducing the mode of temperature, discharge the heat in phase-change material.Therefore the present invention can recycle, and meets the standard of energy-saving and emission-reduction.
(5) air bag (18) with toughness is placed in the lower end of hollow structure, can carry out the compression and expansion in certain limit, for filling, compare front and back material volume variation, the existence of air bag, can make phase-change material and deep trouth conducting strip all the time in good thermo-contact simultaneously.
(6) sidewall of the conducting strip of deep groove structure can increase the contact area with hollow structure, realizes heat to the quick transmission of phase-change material.
Accompanying drawing explanation
Fig. 1 is the solution of the present invention structure chart;
Fig. 2 is the Temperature Distribution schematic diagram of work of the present invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of optimal case of anhydrous cooling thermal capacitance high-capacity optical fiber laser is proposed, as shown in Figure 1, a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser, comprise substrate 11, radiating groove 12, LD and passive device 13 and optical fiber 14, substrate 11 upper surfaces have symmetrical a plurality of radiating groove 12, LD and passive device 13 and optical fiber 14 are placed on substrate 11, substrate 11 inside are provided with hollow structure 15, conducting strip 16, fill phase-change material 17 and air bag 18, it between hollow structure 15, is the conducting strip 16 of deep groove structure, the air bag 18 with toughness is placed in the lower end of hollow structure 15, phase-change material 17 density when solid-state and liquid state is different, phase-change material 17 is in absorbing heat process, by solid, gradually become liquid, the volume of phase-change material 17 increases, now air bag 18 is compressed, additional volumes is provided, phase-change material 17, in exothermic process, is become solid-stately from liquid state, the volume of phase-change material 17 reduces, and now air bag expands, and fills up Volume Loss.
Described conducting strip 16 is same structure workpiece with substrate 11 or implements good thermo-contact, so that the conduction of heat low thermal resistance.
The shape of described radiating groove 12 matches with the profile that is placed on each parts in radiating groove 12, in order to increase the area of dissipation of radiating groove 12 sidewalls, improves heat transfer efficiency.For optical fiber, be placed on the U-lag, V-shaped groove or the other forms of deep gouge that on substrate, wash out; For as body devices such as pumping LD and bundling devices, be placed on the shallow slot that meets device profile washing out on substrate, increase side area of dissipation.
Substrate interior adopts hollow structure 15 designs, for filling temp, controls material, and the periphery of hollow structure and upside adopt overall construction design, are beneficial to heat and conduct downwards.The size of hollow structure is determined by phase-change material volume.
Use solid-liquid phase change material 17 as energy-accumulation material, utilize material from phase transformation for the latent heat of phase change liquid process, system thermal is absorbed, reach the object that maintains main body device temperature.The heat Q that the mass M of phase-change material absorbs as required and material phase transformation latent heat L combined calculation, meet relation as follows:
M=Q/L （1）
After known materials density p, can calculate material requested volume V and be:
V=M/ρ （2）
For example use phase change paraffin as heat-storing material, its latent heat of phase change can reach 240kJ/kg.The laser that is 2000W for heat radiation power, the laser work time, while being 180s, the heat Q producing in process was:
Q=2000×180J=360kJ （3）
Only from heat angle, it is the laser of the 2000W 180s that normally works that the latent heat of 1.5kg phase change paraffin can meet heat radiation power.
Hollow structure 15 upper ends are designed to deep groove structure 16, with substrate 11 be same structure workpiece, or implement good thermo-contact, in order to heat low thermal resistance, conduct.Deep groove structure 16 has been realized the effect of conducting strip, gos deep into, in phase-change material 17, heat being conducted downwards, and the sidewall of deep trouth can increase contact area, realizes heat to the quick transmission of phase-change material.
Air bag 18 is placed in the lower end of hollow structure 15, and air bag 18 has pliability, can carry out the compression and expansion in certain limit.Phase-change material is in solid-state and density different when liquid, and the former density ratio the latter is large.Phase-change material, in absorbing heat process, if phase-change material is solid-liquid phase change, gradually becomes liquid by solid, and overall volume increases, and now air bag is compressed, and additional volumes is provided; When phase-change material is in exothermic process, from liquid state, become solid-stately, overall volume reduces, and now air bag expands, and fills up Volume Loss.Therefore, the existence of air bag, can make phase-change material and deep trouth conducting strip all the time in good thermo-contact.
If density is ρ when phase-change material is solid-state
gu, when liquid, density is ρ
liquid,, for the material of fixed mass M, the volume change Δ V before and after phase transformation can be calculated as follows completely:
Still use phase change paraffin for example, when it is solid-state, density is about 0.88g/cm3, and when liquid, density is about 0.77g/cm3, and according to formula 4, the solid-state and liquid change in volume of 2kg phase change paraffin is 244cm
3, volume change is 14.4%.Therefore the air bag volume change of, placing in hollow structure also needs to be greater than 244cm
3.
Be illustrated in figure 2 and use working temperature schematic diagram after structure of the present invention, heat radiation power 2000W wherein, simulation time 180s, packing material is 2kg phase change paraffin, 22 ℃ of room temperatures.By hot emulation, obtain Temperature Distribution result, use after the present invention, region 21 temperature are 34.6 ℃, and region 22 temperature are 33.5 ℃, and region 23 temperature are 31.8 ℃, and region 24 temperature are 29.0 ℃, and region 25 temperature are 27.8 ℃.Laser bodies device is positioned on region 21, and within temperature belongs to normal range of operation, temperature can be effectively controlled.
The content not being described in detail in specification of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. an anhydrous cooling thermal capacitance high-capacity optical fiber laser, it is characterized in that: comprise substrate (11), radiating groove (12), LD and passive device (13) and optical fiber (14), substrate (11) upper surface has symmetrical a plurality of radiating groove (12), LD and passive device (13) and optical fiber (14) are placed on substrate (11), substrate (11) inside is provided with hollow structure (15), conducting strip (16), fill phase-change material (17) and air bag (18), it between hollow structure (15), is the conducting strip (16) of deep groove structure, the air bag (18) with toughness is placed in the lower end of hollow structure (15), phase-change material (17) density when solid-state and liquid state is different, phase-change material (17) is in absorbing heat process, by solid, gradually become liquid, the volume of phase-change material (17) increases, now air bag (18) is compressed, additional volumes is provided, phase-change material (17), in exothermic process, is become solid-stately from liquid state, the volume of phase-change material (17) reduces, and now air bag expands, and fills up Volume Loss.
2. a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser according to claim 1, is characterized in that: described conducting strip (16) is same structure workpiece with substrate (11) or implements good thermo-contact.
3. a kind of anhydrous cooling thermal capacitance high-capacity optical fiber laser according to claim 1, it is characterized in that: the shape of described radiating groove (12) matches with the profile that is placed on each parts in radiating groove (12), in order to increase the area of dissipation of radiating groove (12) sidewall, improve heat transfer efficiency.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106936056A (en) * | 2017-04-26 | 2017-07-07 | 北京航天控制仪器研究所 | A kind of thermal capacitance cooling liquid laser |
| CN107123922A (en) * | 2017-07-12 | 2017-09-01 | 中国工程物理研究院总体工程研究所 | Phase-change heat-storage fibre cladding power stripper |
| CN107623244A (en) * | 2016-07-14 | 2018-01-23 | 中国兵器装备研究院 | A kind of optical fiber cooling apparatus of the optical fiber laser based on Phase cooling |
| CN109244805A (en) * | 2018-11-02 | 2019-01-18 | 中国科学院西安光学精密机械研究所 | A kind of phase transformation thermal control system and method for high-power laser diode pumping source array |
| CN109340876A (en) * | 2018-11-20 | 2019-02-15 | 赵春雷 | Two-phase power transformation magnetic heat storage device and its application method |
| CN112310801A (en) * | 2020-11-09 | 2021-02-02 | 中国工程物理研究院应用电子学研究所 | Phase-change cooling semiconductor laser device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623244A (en) * | 2016-07-14 | 2018-01-23 | 中国兵器装备研究院 | A kind of optical fiber cooling apparatus of the optical fiber laser based on Phase cooling |
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| CN107123922A (en) * | 2017-07-12 | 2017-09-01 | 中国工程物理研究院总体工程研究所 | Phase-change heat-storage fibre cladding power stripper |
| CN109244805A (en) * | 2018-11-02 | 2019-01-18 | 中国科学院西安光学精密机械研究所 | A kind of phase transformation thermal control system and method for high-power laser diode pumping source array |
| CN109340876A (en) * | 2018-11-20 | 2019-02-15 | 赵春雷 | Two-phase power transformation magnetic heat storage device and its application method |
| CN109340876B (en) * | 2018-11-20 | 2024-03-26 | 赵春雷 | Dual-phase electromagnet heat storage device and use method thereof |
| CN112310801A (en) * | 2020-11-09 | 2021-02-02 | 中国工程物理研究院应用电子学研究所 | Phase-change cooling semiconductor laser device |
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