Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-01-14
1999-07-27
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347239, 359305, 359313, G02F 133
Patent
active
059298936
ABSTRACT:
A multi-channel acousto-optic spatial modulator for fast signal processing by a plurality of acousto-optic modulating cells connected in a line. The multi-channel acousto-optic spatial modulator in accordance with the present invention comprises a plurality of modulating cells each for modulating the incident light, acoustic waves being created within each of said plurality of modulating cells; and a plurality of absorbing plates each interposed between said two modulating cells for shielding the acoustic wave created within one of said two modulating cells from being propagated into the other of said two modulating cells. Each of the modulating cells comprises a unit crystal upon which a light is incident, a piezoelectric transducer coupled to the top surface of the unit crystal and having one pair of electrodes for allowing an acoustic wave to be created in the unit crystal in response to the signal applied to the one pair of electrodes; and an acoustic wave absorber coupled to the top surface of the unit crystal for absorbing the acoustic wave propagating in the unit crystal. Thus, a moving diffraction grating is formed within the unit crystal as the acoustic wave created by the piezoelectric transducer is reflected by one side surface of the unit crystal and propagated to the other side surface. The plurality of modulating cells are connected such that the orientation of the top surface of the unit crystal alternates with every cell.
REFERENCES:
patent: 4000493 (1976-12-01), Spaulding et al.
patent: 5268911 (1993-12-01), Young
Adrianus Korpel, "Acousto-Optics--A Review of Fundamentals", Proceedings of the IEEE, vol. 69, No. 1, (pp. 48-53), Jan., 1981.
Peter Kellman, et al., "Integrating Acousto-Optic Channelized Receivers", Proceedings of the IEEE, vol. 69, No. 1, (pp. 93-100), Jan. 1981.
Eddie H. Young, Jr., et al., "Design Considerations for Acousto-Optic Devices", Proceedings of the IEEE, vol. 69, No. 1, (pp. 54-64), Jan., 1981 .
Epikhin Viacheslav M.
Shestak Sergey A.
Son Jung Young
Korea Institute of Science and Technology
Le N.
Pham Hai C.
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