Optical filter assembly with selectable bandwidth and rejection

Details Optical filter assembly with selectable bandwidth and rejection Optical filter assembly with selectable bandwidth and rejection

2007-09-05

2010-02-02

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C349S018000, C356S365000, C359S322000

Reexamination Certificate

active

07655898

ABSTRACT:
An optical filter assembly having selectable bandwidth is presented. The optical filter assembly includes a first optical filter, a first optical retarder with optical retardance R1, a second optical retarder with optical retardance R2, a polarization switch positioned between the first and second retarders which causes their retardances to substantially add in a first switch setting and to substantially subtract in a second switch setting, and an exit polarizer. A multispectral imaging system using tunable optical filters having selectable bandwidth is presented. A method of filtering light is also presented. The method includes providing a first optical filter, providing a dynamic bandwidth stage including a polarization switch, selecting a first setting of the polarization switch, and producing a first filter action for light passing through the first filter and the dynamic bandwidth stage.

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A. Yariv and P. Yeh, Wiley, Optical Waves in Crystals, Ch. 5, pp. 121-154 (1984).

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