Acousto-optical laser isolator

Details Acousto-optical laser isolator Acousto-optical laser isolator

1987-01-20

1988-04-05

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Optical output stabilization

372703, 372 94, 372 28, 372 20, 372 9, 350358, H01S 313

Patent

active

047363827

ABSTRACT:
An acousto-optical isolator for isolating unwanted, backwardly propagating laser beams. The isolator includes a first Bragg cell to shift the frequency of a desired, forwardly propagating beam by a first step, a second Bragg cell to shift the frequency by a second, converse step back to its original value, and an attenuator between the two Bragg cells. The frequency of a backwardly propagating beam is shifted by the second step in the second cell and then is shifted back to its original value in the first cell. The attenuator attenuates a signal having a frequency equal to the original beam frequency shifted by the second step. Accordingly, the backwardly propagating beam is attenuated but the forwardly propagating one is not. Using dual-transducer Bragg cells, the preferred direction of propagation can rapidly be reversed.

REFERENCES:
patent: 3928814 (1975-12-01), Feichtner
patent: 4028636 (1977-06-01), Hughes
patent: 4332441 (1982-06-01), Margolis
patent: 4390247 (1983-06-01), Freyre
patent: 4460250 (1984-07-01), Freyre et al.
patent: 4586184 (1986-04-01), Hess
N. Uchida et al., "Acoustooptic Deflection Materials and Techniques," Proceedings of the IEEE, vol. 61, No. 8, Aug. 1973, pp. 1073 thru 1092.

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