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Proceedings Paper

HgCdTe energy gap modification due to laser irradiation
Author(s): Jean-Pierre Moeglin; Bernard Gautier; A. Boffy
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Paper Abstract

Experimental investigations of the effects of laser irradiation on the response (sensitivity) of HgCdZnTe photoconductors (p type) working at ambient temperature have been performed. In-band (band III) irradiation of these devices has been carried out with two collinear CO2 laser beams: a CW probe laser (beam diameter ? = 60 ?m) modulated by an acousto-optical modulator at a frequency of 500 kHz with a low energy output level giving the reference signal of the tested detector, and a second pulsed laser (named pump laser with ? = 300 ?m) used as the irradiation source. The pulse characteristics are a maximum energy of 200 mJ and a pulse duration of 2.5 ?s. These two CO2 lasers are part of an JR detector test bench design for experimental studies in JR band II (3-5 ?m) and band III (8-12 ?m) but only the experiments in band III are described herein. The irradiation densities range from 20 ?J/cm2 to 6.6 J/cm2. Both reversible effects, when the morphological damage threshold is not reached, and irreversible ones above this threshold have been observed. Moreover, it has been shown that irradiation produces a dramatic sensitivity decrease due to alloy concentration redistribution and thus causes a modification of the initial gap energy.

Paper Details

Date Published: 25 January 2001
PDF: 4 pages
Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); doi: 10.1117/12.414016
Show Author Affiliations
Jean-Pierre Moeglin, French-German Research Institute of Saint-Louis (France)
Bernard Gautier, French-German Research Institute of Saint-Louis (France)
A. Boffy, French-German Research Institute of Saint-Louis (France)


Published in SPIE Proceedings Vol. 4184:
XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Antonio Lapucci; Marco Ciofini, Editor(s)

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