Patent
1979-11-13
1980-12-23
Rosenberger, R. A.
350 16, 350150, 350355, G01B 2700
Patent
active
042406960
ABSTRACT:
Disclosed is an optical filter, including a plurality of adjacent layer pairs, each pair having an incident and an emergent surface and including a first dielectric layer having a thickness t and a refractive index n, a second dielectric layer, adjacent to the first layer, having a thickness t and a refractive index n, and a control electrode disposed between and in electrical contact with the layers. The filter further includes a plurality of ground electrodes disposed on the layer pairs to electrically contact each incident and emergent surface, a source of electric potential, and a switch for connecting the source between the control electrodes and the ground electrodes, whereby light having a wavelength .lambda.=4nt will be reflected by the filter upon closing the switch and thereby applying the electric potential in opposite directions across the first and second layer pairs. The plurality of layer pairs may include m layer pairs, with the thickness of each dielectric layer in the ith pair (i=1, 2, 3 . . . m) being t.sub.i, such that nt.sub.i =.lambda..sub.i /4, the filter thereby being adapted to reflect light having wavelength in the range .lambda. .sub.1, .lambda..sub.2, .lambda..sub.3 . . . .lambda..sub.m.
REFERENCES:
patent: 2493200 (1950-01-01), Land
patent: 3427092 (1969-02-01), Smith
Yeh et al., "Electromagnetic Propagation in Periodic Stratified Media", 67 J. Opt. Soc. Am. 423 (1977).
Tracy John M.
Yeh Pochi A.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
Rosenberger R. A.
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