Liquid crystal Fabry-Perot etalon with glass spacer

Details Liquid crystal Fabry-Perot etalon with glass spacer Liquid crystal Fabry-Perot etalon with glass spacer

1992-02-03

1994-06-14

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

356352, 359 70, 359 66, 359 93, 359578, G02F 1137, G02B 2700

Patent

active

053215397

ABSTRACT:
A tunable wavelength-selective filter includes a glass substrate, a transparent electrode layer, a highly reflective mirror, an alignment layer, a liquid crystal layer, another alignment layer, a transparent material layer whose refractivity index is substantially equal to that of the liquid crystal layer, another highly reflective mirror, another transparent electrode layer, and another glass substrate, which are stacked in this order. An etalon cavity of the filter includes two layers, the liquid crystal layer and the transparent material layer (such as a glass plate), which enables the cavity length to be increased without increasing absorption and scattering of the cavity. This makes it possible to narrow the FWHM, quicken the response time, and increase the transmittance of the filter. Applications for the filter include a double cavity structure tunable wavelength-selective filter of a wide tunable range, and a photodetector of a simple construction.

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