Multilayer thin film bandpass filter

Details Multilayer thin film bandpass filter Multilayer thin film bandpass filter

1997-09-12

2000-01-25

Spyrou, Cassandra

Optical: systems and elements

Light interference

Produced by coating or lamina

359587, 359588, 359885, G02B 528, G02B 510, G02B 522

Patent

active

060184213

ABSTRACT:
A novel design for producing bandpass filters with essentially square shapes with little or no ripple in the passband zone. Filters are of the all-dielectric type consist of multiple cavities of bandpasses. Quarter wave thick layers of low index material separate all of the cavities from each other. Multiple half-waves may be added to the outer cavity quarter-wave stacks in particular. This invention provides the addition of half wave to some of the inner cavity stacks to remove ripple that would otherwise be present. Together, these additional half wave layers added to the outer and inner cavities sharpen the transition from low transmission to high transmission without unduly adding ripple to the high transmission zone.

REFERENCES:
patent: 5144498 (1992-09-01), Vincent et al.
patent: 5719989 (1998-02-01), Cushing
Thin Film. Optical Filters, H. A. Macleod, McGraw Hill p. 206-219, 270-276.

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