Non-mechanical optical path switching and its application to dua

Details Non-mechanical optical path switching and its application to dua Non-mechanical optical path switching and its application to dua

1991-02-11

1992-07-07

Arnold, Bruce Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

356370, 356414, 359247, 359281, G02F 101

Patent

active

051287978

ABSTRACT:
A non-mechanical optical switch is provided for alternately switching a monochromatic or quasi-monochromatic light beam along two optical paths. A polarizer polarizes light into a single, e.g., vertical component which is then rapidly modulated into vertical and horizontal components by a polarization modulator. A polarization beam splitter then reflects one of these components along one path and transmits the other along the second path. In the specific application of gas filter correlation radiometry, one path is directed through a vacuum cell and one path is directed through a gas correlation cell containing a desired gas. Reflecting mirrors cause these two paths to intersect at a second polarization beam splitter which reflects one component and transmits the other to recombine them into a polarization modulated beam which can be detected by an appropriate single sensor.

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