High efficiency acousto-optic modulator
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Jan 29, 1993
filing date -
Jan 29, 1993
priority date (Note) -
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Abstract
The efficiency of an acousto-optic modulator or deflector is increased by re-using the undiffracted beam, causing the same light beam to travel multiple times through the modulator. In order to maintain the bandwidth of the modulator, the multiple passes are made co-axial. A polarizing beam combiner and a waveplate are used to transmit the incoming beam but reflect the beam on the second pass. The gain in the efficiency of the modulator is particularly large for low efficiency modulators.
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