A holographic light focusing device is disclosed. The device generally comprises an elongate member having an input end and an output end, a light source disposed at the input end, and a light guide extending along the elongate member and operable to guide a light beam emitted from the light source to...http://www.google.ca/patents/US6356366?utm_source=gb-gplus-sharePatent US6356366 - Holographic light focusing device
