Three-element stressed Ge:Ga photoconductor array for the infrared telescope in space

Details Three-element stressed Ge:Ga photoconductor array for the infrared telescope in space Three-element stressed Ge:Ga photoconductor array for the infrared telescope in space

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apopt..31..460h&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 31, Feb. 1, 1992, p. 460-465.

Computer Science

Performance

19

Gallium, Germanium, Infrared Telescopes, Photoconductors, Quantum Efficiency, Spaceborne Telescopes, Arrays, Axial Stress, Far Infrared Radiation, Japanese Space Program, Performance Tests, Transient Response

Scientific paper

A photoconductor array is described and tested in terms of its performance as part of the IR Telescope in Space (IRTS). The three-element stressed Ge:Ga phototoconductor array is fabricated with a stable compact stressing apparatus based on cone-disk springs, and the cut-off wavelength is established at about 180 microns. The experiments are conducted under conditions of low photon influx (approximately 100,000 photons/s) and measured at 2.0 K in a liquid-helium dewar. The product of quantum efficiency and photoconductive gain is about one with a 2-Hz chopping frequency, and the responsivity is found to be about 100 A/W. The results of the test indicate that both a slow transient response and a nonlinear response are present. The nonlinear response is dependent on the background photon influx and suggests that the product of quantum efficiency and photoconductive gain has a time constant.

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