Liquid crystal optical frequency shifter

Details Liquid crystal optical frequency shifter Liquid crystal optical frequency shifter

1995-05-01

1998-04-14

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With polariscopes

359278, G02F 105

Patent

active

057399085

ABSTRACT:
An optical frequency shifter is provided to change the frequency of a coherent input light beam by imparting periodic increases in phase to the beam. This increase in phase is caused by ferroelectric liquid crystals (FLCs) in conjunction with quarter wave plates. The FLCs are repeatedly switched on and off by electrical signal generators, adding phase shift in steps, which in turn results in a higher output optical frequency.

REFERENCES:
patent: 4197008 (1980-04-01), Pinnow et al.
patent: 5132826 (1992-07-01), Johnson et al.
patent: 5168381 (1992-12-01), Walba
patent: 5231521 (1993-07-01), Johnson et al.
patent: 5243455 (1993-09-01), Jonson et al.
patent: 5528393 (1996-06-01), Sharp et al.
patent: 5552912 (1996-09-01), Sharp et al.
Article "Quantized Complex Ferroelectric Liquid Crystal Spatial Light Modulators" by M. O. Freeman et al, Applied Optics, vol. 31, No. 20, Jul. 1992, pp. 3917-3929.

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