Temperature compensation of liquid-crystal etalon filters

Details Temperature compensation of liquid-crystal etalon filters Temperature compensation of liquid-crystal etalon filters

1994-12-14

1996-09-24

Mai, Huy

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 85, G02F 1133, G02F 1137

Patent

active

RE0353370

ABSTRACT:
A compensator for thermal or other uncontrollable effects in a liquid-crystal etalon filter. The narrow pass band of the filter is controlled by adjusting the amplitude of an AC drive signal applied to the electrodes on either side of the liquid crystal in the filter. An optical detector detects the intensity of light from a narrow-bandwidth input beam passed by the detector. Electrical circuitry determines the bipolar amplitude of the component of the light intensity that is at twice the frequency of the AC drive signal (the doubled-frequency amplitude) and adjusts the amplitude of the AC drive signal in response to the doubled-frequency amplitude so as to reduce the doubled-frequency amplitude toward zero.

REFERENCES:
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patent: 4834504 (1989-05-01), Garner
J. S. Patel et al., "Electrically tunable optical filter for infrared wavelength using liquid crystals in a Fabry-Perot etalon," Appl. Phys. Lett., Oct. 1990, vol. 57, No. 17, pp. 1718-1720.

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