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12 June 1996 1-GHz bandwidth isotropic acousto-optic cell
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The increase in information capacity of acousto-optic systems can usually be achieved by increasing the bandwidth (Delta) f of their acousto-optic cells. At the present time, acousto-optic cells can have (Delta) f of 1.2 GHz. During the process of manufacturing a system with maximum possible frequency characteristics, some problems could arise, the main one is the problem of electric power feeding to the top electrode of a piezoelectric transducer. This problem is caused by small dimensions of the top electrode (tens or hundred micrometer). Due to the same reason, the acoustic power density drastically increases in the acousto-optic cells (up to 0.5 - 1.0 kW/cm2), which could produce nonlinear effects in the medium of propagation, and thus considerably restrict the dynamic range of the acousto-optic systems. Moreover, high acoustic power localized in a small volume can result in some thermoacoustic effects and even destroy the acousto-optic material. High electric strength (up to 30 - 50 kV/cm) in the material of the piezoelectric transducer can also be a problem. These problems are very hard to solve, and their solutions usually decrease several parameters of the acousto-optic cell, and in some cases, there are no solutions at all. To some extent, feeding the electric power is similar to the common problems of UHF transistor manufacturing, and such experience can be used, but the other problems are very specific and have nothing common in the modern electronics. That is why new alternate solutions are very important.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sergei V. Kulakov, Victor V. Kludzin, Oleg B. Gusev, Oleg G. Gabaraev, Vyacheslav G. Nefedov, and Victor V. Molotok "1-GHz bandwidth isotropic acousto-optic cell", Proc. SPIE 2754, Advances in Optical Information Processing VII, (12 June 1996);

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