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Liquid-crystal laser
A liquid-crystal laser is a laser that uses a liquid crystal as the resonator cavity, allowing selection of emission wavelength and polarization from the active laser medium. The lasing medium is usually a dye doped into the liquid crystal. Liquid-crystal lasers are comparable in size to diode lasers, but provide the continuous wide spectrum tunability of dye lasers while maintaining a large coherence area. The tuning range is typically several tens of nanometers.〔Woltman 2007, p. 357〕 Self-organization at micrometer scales reduces manufacturing complexity compared to using layered photonic metamaterials. Operation may be either in continuous wave mode or in pulsed mode.〔
==History==
Distributed feedback lasing using Bragg reflection of a periodic structure instead of external mirrors was first proposed in 1971,〔 predicted theoretically with cholesteric liquid crystals in 1978,〔 achieved experimentally in 1980,〔 and explained in terms of a photonic band gap in 1998.〔Woltman 2007, p. 310〕〔〔
A United States Patent issued in 1973 described a liquid-crystal laser that uses "a liquid lasing medium having internal distributed feedback by virtue of the molecular structure of a cholesteric liquid-crystal material."〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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