High transmission multi-wavelength filter and method

Details High transmission multi-wavelength filter and method High transmission multi-wavelength filter and method

2005-06-28

2008-03-25

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

By polarized light examination

With polariscopes

C359S485050, C359S615000, C359S339000, C359S629000

Reexamination Certificate

active

07349089

ABSTRACT:
An optical arrangement and method of filtering include a beam splitter that accepts an incident beam and transmits light from the incident beam of a first polarization and reflects light from the incident beam of a second polarization. The transmitted light is a first beam and the reflected light is a second beam. A first spectral filter, receives the first beam, reflects a first spectral band of the first beam, and transmits the remainder of the first beam. A second spectral filter receives the remainder of the first beam and reflects a second spectral band of the first beam. The first and second spectral filters can also receive the second beam and reflect similar first and second spectral bands. The spectral bands are then returned to the beam splitter, where they may be directed toward a dispersal element or an array of photodetectors.

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