Optical filters with coatings transmissive in narrow waveband re

Details Optical filters with coatings transmissive in narrow waveband re Optical filters with coatings transmissive in narrow waveband re

1986-10-27

1995-03-21

Nelson, Peter A.

Compositions

Light transmission modifying compositions

Inorganic crystalline solid

427165, 428432, 428918, 428920, 357588, G02B 520

Patent

active

053992989

ABSTRACT:
An optical filter comprises a multilayer coating adherent to a substrate, the coating comprising at least four superimposed layer collections. Each layer collection has ordered first, second and third layers of which the first and third layers are made of a first material and are 0.6 quarter wavelengths thick whereas the second layer is made of a second material and is 6.8 quarter wavelengths thick. One of these materials has a high refractive index in the range 1.9 to 2.5 whilst the other of these materials has a low refractive index in the range 1.3 to 1.7. The preferred high index material is zinc sulphide and the preferred low index material is thorium fluoride.
The optical filter is generally transmissive except in a number of narrow waveband regions which include respective known laser wavelengths.

REFERENCES:
patent: 4068260 (1978-01-01), Ohneda et al.
patent: 4128303 (1978-12-01), Onoki et al.
patent: 4284323 (1981-08-01), Jankowitz
patent: 4309075 (1982-01-01), Apfel et al.
patent: 4313647 (1982-02-01), Takazawa
patent: 4373782 (1983-02-01), Thelen
patent: 4377324 (1983-03-01), Durand et al.
patent: 4659178 (1987-04-01), Kyogoku
patent: 4666250 (1987-05-01), Southwell

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