High endurance near-infrared optical window

Optical: systems and elements – Light interference – Produced by coating or lamina

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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.

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