Optical filter

Details Optical filter Optical filter

1998-01-28

1999-11-09

Spyrou, Cassandra

Optical: systems and elements

Light interference

Produced by coating or lamina

359588, G02B 530

Patent

active

059825472

ABSTRACT:
An optical filter, which has a predetermined transmittance and a low reflectance at a wavelength .lambda. of, for example, 780 nm, comprises a metal film and a dielectric thin-film deposited adjacent to the metal film, the dielectric thin-film having a refractive index lower than that of the metal film and a thickness of .lambda./40 or less. Also disclosed is an optical filter, comprising a substrate, a plurality of sets of dielectric thin-films (H) with a high refractive index and dielectric thin-films (L) with a low refractive index, and a metal layer. The dielectric thin-films (H) and the dielectric thin-films (L) are alternately deposited on the substrate and the metal film is provided between one dielectric thin-film (H) and the adjacent dielectric thin-film(L). The dielectric thin-film (L) adjacent to the metal film has a thickness .lambda./40 or less.

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patent: 5541770 (1996-07-01), Pellicori et al.
patent: 5834103 (1998-11-01), Bond et al.
patent: 5837361 (1998-11-01), Glaser et al.

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