Liquid crystal tuned birefringent filter

Details Liquid crystal tuned birefringent filter Liquid crystal tuned birefringent filter

1979-06-05

1983-07-19

Corbin, John K.

350335, G02F 113

Patent

active

043940692

ABSTRACT:
Moderately narrow band, tunable, birefringent filters are disclosed using zero-twist liquid crystal cells as variable retarders in a Lyot-type birefringent filter. These filters can achieve analytically useful levels of resolution and stray-light ratios for costs that are competitive with prism and grating monochromators. These birefringent filters can be tuned and/or rendered opaque by the application of a suitable voltage to the cells. Thus, a variety of different optical instruments can be constructed with no moving parts. Power requirements are negligible. A useful filter can be designed to occupy a volume less than one cubic inch. These properties render such a filter ideally suited to microprocessor control.

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Journal of Applied Physics, vol. 44, No. 11, Nov. 1973, Scheffer, T. J., "New Multicolor Liquid Crystal Displays That Use A Twisted Nematic Electro-Optical Cell".
Tarry: "Electronically Tunable Narrow Band Optical Filter," Electronics Letters, vol. 11, pp. 471-472, Sep. 18, 1975.
Sato et al. "Liquid Crystal Color Light Valve," IEEE Trans. on Electron Devices, vol. ED-21, pp. 171-172, Feb. 1974.

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