Dichroic filters with low nm per degree sensitivity

Details Dichroic filters with low nm per degree sensitivity Dichroic filters with low nm per degree sensitivity

1998-06-19

1999-12-07

Spyrou, Cassandra

Optical: systems and elements

Light interference

Produced by coating or lamina

359490, 359634, G02B 110

Patent

active

059993219

ABSTRACT:
Multilayer thin film dichroic filters composed of alternating layers of high (H) and low (L) refractive index have three groups, a lower group next to the substrate having a ratio Ra of high and low index layers Ra1; a second mid group having a ratio Ra of high and low index layers Ra2; and a third upper group having a ratio Ra of high and low index layers Ra3; and the ratios have the relationship Ra1<Ra2<Ra3. Such filters exhibit improved angle sensitivity and wavelength transition values, and are useful for example in color projection displays.

REFERENCES:
patent: 3996461 (1976-12-01), Sulzbach et al.
patent: 5532763 (1996-07-01), Jansssen et al.

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