Two-Hundred (200) MHZ Bandwidth Step-Array Acousto Optic Beam Deflector

S. K. Yao; E. H. Young

doi:10.1117/12.955047

30 December 1976 Two-Hundred (200) MHZ Bandwidth Step-Array Acousto Optic Beam Deflector

S. K. Yao, E. H. Young

Proceedings Volume 0090, Acousto-Optics: Device Development/Instrumentation/Applications; (1976) https://doi.org/10.1117/12.955047
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

The performance of an acoustooptic beam deflector depends on its bandwidth and diffraction efficiency with its acoustic delay time providing a trade-off possibility between resolvable spots and access time. Transducer power density considerations with present fabrication techniques place a limit on acoustooptic beam deflectors at 100 MHz bandwidth with 50% efficiency. It has been known for some time that the deflector efficiency bandwidth product can be improved with acoustic beam steering by stepped-array-transducers. However, a simple practical fabrication technique for the step-array-transducer in the UHF region is yet to be developed, due to miniature step dimensions. Employing a wedged intermediate medium to make up the precise steps, we have successfully constructed a number of wideband step-array acoustooptic beam deflectors with total flexibility in interaction medium selection. Typical parameters on our deflectors are 50% diffraction efficiency at 750 mW rf drive power, up to 250 MHz 3 db bandwidth (200 MHz 1.5 db), and 2mm by 30 mm optical aperture with PbMoO4 deflector body. That is a deflector of 2000 spots at 8.5 microsecond access time. Ultimate deflector bandwidth limit with this fabrication technique is estimated to be about 350 MHz.

Citation Download Citation

S. K. Yao and E. H. Young "Two-Hundred (200) MHZ Bandwidth Step-Array Acousto Optic Beam Deflector", Proc. SPIE 0090, Acousto-Optics: Device Development/Instrumentation/Applications, (30 December 1976); https://doi.org/10.1117/12.955047

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