High efficiency acousto-optic modulator

Details High efficiency acousto-optic modulator High efficiency acousto-optic modulator

1993-01-29

1994-10-25

Hellner, Mark

Optical: systems and elements

Optical modulator

Light wave temporal modulation

G02F 133

Patent

active

053594517

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.

REFERENCES:
patent: 4473275 (1984-09-01), David, Jr. et al.
patent: 5105304 (1992-04-01), Tanaka et al.

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