Tunable diffractive subtractive filter

Details Tunable diffractive subtractive filter Tunable diffractive subtractive filter

1978-09-14

1981-02-17

Bauer, Edward S.

350341, 350162R, G02F 1133

Patent

active

042511372

ABSTRACT:
A diffractive subtractive filter is made tunable by controllably varying the index of refraction of a fluid medium in contact with a surface relief pattern of a solid diffractive phase medium. A liquid crystal is the preferred fluid.

REFERENCES:
patent: 3787110 (1974-01-01), Berreman et al.
patent: 3957354 (1976-05-01), Knop
patent: 4037929 (1977-07-01), Bricot et al.
patent: 4130347 (1978-12-01), Knop
Flanders et al.: "Alignment of Liquid Crystals Using Submicrometer Periodicity Gratings," Applied Physics Letters, vol. 32, May 15, 1978, pp. 597-598.

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