1 October 1990 Programmable frequency excision and adaptive filtering with a GaAs/AlGaAs/GaAs heterojunction photoconductor array
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Optical Engineering, 29(10), (1990). doi:10.1117/12.55722
Abstract
The first demonstration of acousto-optical excision using a GaAs photodetector array is reported. A maximum isolation of 40 dB was obtained using a six element GaAs interdigitated finger double heterojunction photo conductor array. The center frequency was 45 MHz, and the swept bandwidth was 6 MHz. The response of discrete GaAs heterojunction photo conductors was linear with bias voltage, potentially making them useful for performing multiplication functions in optical analog filters. New concepts of using these photo conductors for optical adaptive filters are presented.
Gordon Wood Anderson, Francis J. Kub, Rebecca L. Grant, Nicolas A. Papanicolaou, John A. Modolo, Douglas E. Brown, "Programmable frequency excision and adaptive filtering with a GaAs/AlGaAs/GaAs heterojunction photoconductor array," Optical Engineering 29(10), (1 October 1990). http://dx.doi.org/10.1117/12.55722
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KEYWORDS
Photoresistors

Digital filtering

Gallium arsenide

Photodetectors

Heterojunctions

Optical filters

Adaptive optics

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