Narrow band algan filter

Details Narrow band algan filter Narrow band algan filter

1991-08-30

1993-01-26

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

252588, 359361, 359578, 359589, 257 17, 257 22, 257 21, 257 76, 257201, G02B 528, F21V 904, H01L 2714

Patent

active

051826704

ABSTRACT:
The invention is a filter device of at least two layers, the first layer of Al.sub.x Ga.sub.(1-x) N and the second layer of Al.sub.y Ga.sub.(1-y) N wherein x and y may have any value from 0 to 1. The invention may be used as a fixed wavelength or tunable wavelength filter or in ultraviolet detectors and laser devices, among other systems. Applications for the invention include detection of UV radiation in environments having a high level of incident infrared and visible radiation, as well as applications requiring detection of UV emission when no other radiation is present.

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