Narrow band selective absorption filter

Details Narrow band selective absorption filter Narrow band selective absorption filter

1990-02-28

1992-04-07

Lovering, Richard D.

Optical: systems and elements

Absorption filter

Superimposed or series

8552, 8661, 252582, 523137, 524 88, 359885, F21V 900, G02B 520, G02B 522, G02C 710

Patent

active

051022133

ABSTRACT:
A solid state form of a dye-solution absorption filter is disclosed. Physical vapor depositable (i.e., evaporable) dyes are codeposited with a polyester matrix in a vacuum system to randomly disperse dye molecules in a solid dilutant. The dyes are selected to absorb at the wavelengths of interest. Dilution in a transparent matrix affords narrow band absorption and good out of band transmittance. Multilayer configurations allow absorption of a plurality of wavelengths. The filter coating conforms to curved and sharply contoured surfaces and layers only 10 microns thick afford very high absorptance.

REFERENCES:
patent: 3853783 (1974-12-01), Tucker
patent: 3895944 (1975-07-01), Wiedemann et al.
patent: 4031109 (1977-06-01), Griffiths et al.
patent: 4587198 (1986-05-01), Fisch
patent: 4622174 (1986-11-01), McKoy et al.
patent: 4935166 (1990-06-01), Lee et al.

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