Acousto-optic bragg cell

Details Acousto-optic bragg cell Acousto-optic bragg cell

1994-03-31

1996-11-19

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave directional modulation

359311, 385 7, G02F 133

Patent

active

055768806

ABSTRACT:
An acousto-optic modulator utilizing light diffraction by phased acoustic waves in a birefringent crystal. The wavevector of the resultant acoustic wave is selected so that the tangents to the loci of the wavevectors of the incident and diffracted light are parallel. This provides a large acceptance angle for the acousto-optic modulator. By simultaneously choosing the acoustic wavevector to be tangential to the locus of the diffracted light wavevector, the acousto-optic modulator also achieves increased modulation bandwidth.

REFERENCES:
patent: 4394060 (1983-07-01), Verber et al.
patent: 4671620 (1987-06-01), Yao
A. Korpel et al, "A Television Display Using Acoustic Deflection and Modulation of Light", Appl. Optics 5 p. 1667, Oct., 1966.
E. I. Gordon, "A Review of Acousto-Optical Deflection and Modulation Devices", Appl. Optics 5 p. 325, Oct. 1966.
I. C. Chang, "Birefringent Phased Array Bragg Cell", IEEE Ultrasonic Proceedings, p. 381.
E. Young et al, "Generalized Phased Array Bragg Interaction in an Anistropic Crystal" SPIE vol. 1476 (1991).
I. C. Chang, "Noncollinear Acousto-Optic Filter with Large Angular Aperture", Applied Phys. Letts. 35 p. 370, Oct. 15, 1974.
L. T. Nguyen & C. S. Tsais "Efficient Wideband Guided-Wave Acoustoptic Bragg Diffraction Using Phased Array . . . ", Appl. Optics 16 p. 1297, May, 1977.
I. C. Chang, "Acousto-Optic Modulator with Wide Bandwidth and Large Angular Aperture", Elec. Lett. 30 p. 1190, Jul., 1994.

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