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30 December 1976 Two-Hundred (200) MHZ Bandwidth Step-Array Acousto Optic Beam Deflector
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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.
© (1976) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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