HgCdTe energy gap modification due to laser irradiation

Jean-Pierre Moeglin; Bernard Gautier; A. Boffy

doi:10.1117/12.414016

25 January 2001 HgCdTe energy gap modification due to laser irradiation

Jean-Pierre Moeglin, Bernard Gautier, A. Boffy

Proceedings Volume 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (2001) https://doi.org/10.1117/12.414016
Event: XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, 2000, Florence, Italy

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.

Citation Download Citation

Jean-Pierre Moeglin, Bernard Gautier, and A. Boffy "HgCdTe energy gap modification due to laser irradiation", Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); https://doi.org/10.1117/12.414016

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