Optical: systems and elements – Light interference – Produced by coating or lamina
Patent
1993-10-27
1995-03-14
Epps, Georgia Y.
Optical: systems and elements
Light interference
Produced by coating or lamina
359359, 359722, 359634, G02B 528
Patent
active
053981332
ABSTRACT:
Multilayers of low refractive index amorphous silicon nitride and high refractive index amorphous silicon are interleaved to construct a near-infrared optical filter. For an edge filter, the structure is transparent to near-infrared light and opaque to visible light. For a band-pass filter, the low-pass filter is superimposed with a high-pass filter. Anti-reflection coating can be added to improve the transmittance. These multilayers are deposited with Plasma Enhanced Chemical Vapor Deposition technique.
REFERENCES:
patent: 3996461 (1976-12-01), Sulzbach et al.
patent: 5243458 (1993-09-01), Hatano et al.
Bausch & Lomb Optical Co., "Infra-Red", Progress Report No. 3, Rochester, New York, Sep. 1958.
Ho Fang-Chuan
Tsai Rung-Ywan
Epps Georgia Y.
Industrial Technology Research Institute
Lin H. C.
Robbins Thomas D.
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