Apparatus to transform with high efficiency a single frequency, linearly polarized laser beam into beams with two orthogonally polarized frequency components orthogonally polarized
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Jul 26, 1996
filing date -
Jul 26, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electro-optical apparatus transforms a single frequency, linearly polarized laser input beam (18) from a light source (10) into an output beam (36) having two collinear orthogonally polarized output beam components (32,33) differing in frequency from each other by the frequency of a stabilized electrical signal (40) provided from an electronic oscillator (38). The output of the oscillator (38) is provided to a power amplifier (42) which is used to drive a piezoelectric transducer (46) affixed to an acousto-optical Bragg cell (52) through which the input beam (18) passes and is transformed into the output beam (36) composed of two beam components (32,33). The electrical output (44) of the power amplifier (42) is adjusted so that each of the output beam components (32,33) has approximately a preselected fraction of the intensity of the input beam (18).
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