Nonlinear tunable optical bandpass filter

Details Nonlinear tunable optical bandpass filter Nonlinear tunable optical bandpass filter

1986-01-22

1990-05-29

Punter, William H.

350164, 350354, G02B 528, G02F 123, G02F 101

Patent

active

049290630

ABSTRACT:
A nonlinear tunable optical bandpass filter of the Fabry-Perot type is disclosed comprising an optically transparent substrate and a plurality of multilayer coatings deposited on a facing side of the substrate. One of the coating layers comprises a spacer being a nonlinear optical coating material having an externally-variable refractive index. The spacer is bounded on two ends by structures of multilayer stacks being alternating thin films of transparent, physically compatible materials. The filter of the invention can be tuned to pass various transmittance wavelengths through the application of external activation apparatus, such as heating by a laser acting on the spacer.

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