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Proceedings Paper

Resonant Cavity Electro-Optic Frequency Modulator For Heterodyne Evaluation Of HgCdTe Detectors At 2.0 Ghz
Author(s): Diann L. Gallagher; Steven Prutzer; James F. Shanley; Richard J. Hanby; Boyd McClaskey; Sandra L. Witman; Thomas F. Gallagher
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Paper Abstract

A resonant cavity electro-optic frequency modulator at 2.0 GHz was developed for high frequency heterodyne characterization of HgCdTe de-tectors. The standard technique for heterodyne evaluation of HgCdTe detectors beats a CO2 laser with the filtered incoherent output of a black-body radiator. For detectors which will be incorporated into laser radar systems, it is desirable to perform characterization tests with a coherent, narrow band signal. The electro-optic modulation technique represents a quick, precise measurement that uses a signal which closely simulates the laser radar Doppler shifted return signal. In the electro-optic modulator, a 2.0 GHz microwave signal is coupled into a CdTe crystal to fre-quency modulate a CO2 laser beam. A dielectrically-loaded cavity insures the phase velocity match of the microwave and the IR signal. The design also allows for modulation at higher order resonances, thus the HgCdTe detectors can also be characterized at 4.0 GHz. No such electro-optic modulator, operating in the GHz frequency range for the evaluation of high speed photodetector performance. is known to have been reported to date.

Paper Details

Date Published: 20 September 1987
PDF: 8 pages
Proc. SPIE 0750, Infrared Systems and Components, (20 September 1987); doi: 10.1117/12.939851
Show Author Affiliations
Diann L. Gallagher, General Electric Company (United States)
Steven Prutzer, General Electric Company (United States)
James F. Shanley, General Electric Company (United States)
Richard J. Hanby, General Electric Company (United States)
Boyd McClaskey, General Electric Company (United States)
Sandra L. Witman, General Electric Company (United States)
Thomas F. Gallagher, University of Virginia (United States)

Published in SPIE Proceedings Vol. 0750:
Infrared Systems and Components
Robert L. Caswell, Editor(s)

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