Multilayer thin film dielectric bandpass filter

Details Multilayer thin film dielectric bandpass filter Multilayer thin film dielectric bandpass filter

1997-12-23

2000-01-04

Henry, Jon W.

Optical: systems and elements

Light interference

Produced by coating or lamina

359588, 359359, G02B 528

Patent

active

060116528

ABSTRACT:
The present invention relates to a multi-layer dielectric bandpass filter having a primary and a secondary passband. A secondary passband outside the reflection zone of the primary passband is optimized to reduce ripple achieving a passband of at least 90% transmission. Optimization comprises modifying the thickness of certain quarter wavelength reflector layers of a single passband filter from true quarter wavelength at the primary passband to non-quarter, or non-integer-multiple quarter wave thickness.

REFERENCES:
patent: 4373782 (1983-02-01), Thelen
patent: 5410431 (1995-04-01), Southwell
patent: 5719989 (1998-02-01), Cushing

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