Resonant Cavity Electro-Optic Frequency Modulator For Heterodyne Evaluation Of HgCdTe Detectors At 2.0 Ghz

Diann L. Gallagher; Steven Prutzer; James F. Shanley; Richard J. Hanby; Boyd McClaskey; Sandra L. Witman; Thomas F. Gallagher

doi:10.1117/12.939851

20 September 1987 Resonant Cavity Electro-Optic Frequency Modulator For Heterodyne Evaluation Of HgCdTe Detectors At 2.0 Ghz

Diann L. Gallagher, Steven Prutzer, James F. Shanley, Richard J. Hanby, Boyd McClaskey, Sandra L. Witman, Thomas F. Gallagher

Author Affiliations +

Proceedings Volume 0750, Infrared Systems and Components; (1987) https://doi.org/10.1117/12.939851
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

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.

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Diann L. Gallagher, Steven Prutzer, James F. Shanley, Richard J. Hanby, Boyd McClaskey, Sandra L. Witman, and Thomas F. Gallagher "Resonant Cavity Electro-Optic Frequency Modulator For Heterodyne Evaluation Of HgCdTe Detectors At 2.0 Ghz", Proc. SPIE 0750, Infrared Systems and Components, (20 September 1987); https://doi.org/10.1117/12.939851

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