Switchable on-axis optical bandstop filter

Details Switchable on-axis optical bandstop filter Switchable on-axis optical bandstop filter

1982-12-16

1983-12-13

Arnold, Bruce Y.

350 37, 350363, G03H 104, G02B 532

Patent

active

044202172

ABSTRACT:
An optical filter is formed by exposing a photosensitive material to direct nd retroreflected coherent optical radiation. These radiations set up standing waves in the material such that, when the material is fixed, variations in parallel, equally spaced layers of some optical property of the material remain. The optical property may be reflectance, index of refraction, or optical density. The layers are spaced apart one-half wavelength of the coherent radiation and act as an interference filter. The material may be capable of being erased and a new filter formed, if desired.

REFERENCES:
patent: 4037932 (1977-07-01), Haas et al.

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