14 August 1989 GaAs/AlGaAs/GaAs Heterojunction Photoconductor Array For Programmable Frequency Excision And Adaptive Filtering
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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 heterojunction photoconductor array. The center frequency was 45 MHz, and the swept bandwidth was 3 MHz. The response of discrete GaAs heterojunction photoconductors was linear with bias voltage potentially making them useful for performing multiplication functions in optical analog filters. Concepts of using these photoconductors for optical adaptive filters are discussed.
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Francis J. Kub, Gordon Wood Anderson, Nicolas A. Papanicolaou, John A. Modolo, Rebecca L. Grant, Douglas E. Brown, "GaAs/AlGaAs/GaAs Heterojunction Photoconductor Array For Programmable Frequency Excision And Adaptive Filtering", Proc. SPIE 1102, Optical Technology for Microwave Applications IV, (14 August 1989); doi: 10.1117/12.960554; https://doi.org/10.1117/12.960554
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KEYWORDS
Photoresistors

Gallium arsenide

Digital filtering

Photodetectors

Adaptive optics

Optical filters

Bragg cells

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