Tunable liquid crystal etalon filter

Details Tunable liquid crystal etalon filter Tunable liquid crystal etalon filter

1990-10-16

1992-09-22

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 66, 359 78, 359 93, 359 94, G02F 11335, G02F 11337, G02F 1137

Patent

active

051502364

ABSTRACT:
A tunable liquid-crystal etalon filter comprising two dielectric stack mirrors defining an optical cavity into which is filled a liquid crystal. Electrodes disposed on the outsides of the mirrors apply an electric field to the liquid crystal, changing its refractive index and thereby changing its optical length. Thereby, the optical pass band of the filter can be electrically changed in a low-powered, compact, rugged, and economical structure.

REFERENCES:
patent: 4630898 (1986-12-01), Jewell
patent: 4779959 (1988-10-01), Saunders
patent: 4790634 (1988-12-01), Miller et al.
patent: 4917476 (1990-04-01), Makh et al.
F. C. Saunders et al., "Novel optical cell design for liquid crystal devices providing sub-millisecond switching," Optical and Quantum Electronics, 1986, vol. 18, pp. 426-430.
J. S. Patel et al., "A reliable method of alignment for smectic liquid crystals," Ferroelectrics, 1984, vol. 59, pp. 137-144.
M. W. Maeda et al, "An Electronically Tunable Fiber Laser with a Liquid-Crystal Etalon Filter as the Wavelength-Tuning Element," Post Deadline Paper PD-4 on Optical Multiple Access Networks, Jul. 25-27, 1990, Monterey, Calif.
M. W. Maeda et al, "Novel Electrically Tunable Filter Based on a Liquid-Crystal Fabry-Perot Etalon for High-Density WDM Systems," Proceedings of the 16th European Conference on Optical Communication, Sep. 16-20, 1990, Amsterdam, The Netherlands, pp. 145-148.

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