1986-08-12
1988-07-26
Laroche, Eugene R.
G02F 111, G02F 133
Patent
active
047596139
ABSTRACT:
An acoustooptic modulator for generating a modulated diffracted beam 14 from a laser beam 10 by refractive Bragg diffraction from a longitudinal compressional acoustic wave directed into a germanium block 21 by a transducer 2.
By tilting the end face 26, 30, so that the angle of incidence is 44 degrees, all the acoustic wave energy is reflected as a shear wave S, at 27 degrees, and is then dissipated in layers 24 of lithium or lead on the upper and lower surfaces 19, 22, of the block. The end face 26 is also disposed obliquely in plan angle to further reduce retroreflection.
REFERENCES:
patent: 3419322 (1965-08-01), Adler
patent: 3771856 (1973-11-01), Eschler
patent: 3944335 (1976-03-01), Saito et al.
patent: 4624534 (1986-11-01), Amano
Gordon, E. I. "A Review of Acoustooptical Deflection and Modulation Devices." Proc. IEEE, vol. 54, No. 10, pp. 1391-1401 (Oct. 1966).
Briody Thomas A.
Haken Jack E.
LaRoche Eugene R.
McCutcheon Nathan W.
U.S. Philips Corp.
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