Double-pass tunable fabry-perot optical filter

Details Double-pass tunable fabry-perot optical filter Double-pass tunable fabry-perot optical filter

1990-04-30

1991-08-13

Lobo, Ian J.

Optical: systems and elements

Light interference

Produced by coating or lamina

359885, 356352, G02B 528, G01B 902

Patent

active

050392018

ABSTRACT:
This invention describes a double-pass optical filter having a pair of reflective surfaces with a pair of optical media of different indices of refraction inserted between the surfaces. Light is then passed through the surfaces and through each of the optical media to obtain selected frequencies. This invention also includes a means for varying the distance between the reflective surfaces so as to tune the filer over a continuous range of frequencies. The continuous simultaneous turning of two resonant can be achieved by merely displacing one reflective surface relative to another.

REFERENCES:
patent: 3471800 (1969-10-01), Congleton et al.
patent: 4269481 (1981-05-01), Yeh et al.
patent: 4377324 (1983-03-01), Durand et al.
patent: 4466699 (1984-08-01), Droessler et al.
patent: 4553816 (1985-11-01), Durand et al.
patent: 4896948 (1990-01-01), Dono et al.

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