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Hybrid-diffractive-optical-filter

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Hybrid diffractive optical filter

Details

Inventors: Nelson, Scott A.; Cox, J. Allen; Jorgenson, Gordon V.;
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Examiner: Arnold; Bruce Y.
Assistant Examiner: Lerner; Martin
Attorney, Agent or Firm: Shudy, Jr.; John G.

A hybrid filter having an inherently planar interference stack adhered to a nonplanar diffractive grating. The filter can have a planarization layer between the stack and grating. The hybrid filter has a spectral light transmittance value that is at least equal to or greater than the transmittance value of the least transmissive filter component. The filter also has a spectral bandwidth that is narrower than the spectral bandwidth of either filter component.

DETAILED DESCRIPTION The present invention is a hybrid combining of a planar interference stack with a nonplanar diffractive grating.
This hybrid optical filter may or may not include a planarization layer between the diffractive grating and the interference stack.
The achievement of either combination has resulted in a filter that has a transmission quality which exceeds that of the least transmissive element of the invention.
Also, the spectral bandwidth of the filter is narrower than the spectral bandwidth of either element.

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