Minimally cooled heterojunction laser heterodyne detectors in metalorganic vapor phase epitaxially grown Hg1-xCdxTe |
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Authors: | C T Elliott N T Gordon T J Phillips H Steen A M White D J Wilson C L Jones C D Maxey N E Metcalfe |
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Affiliation: | (1) Defence Research Agency, Malvern, WR14 3PS Worcestershire, UK;(2) Present address: Norwegian Defence Research Establishment, Kjeller, Norway;(3) GEC-Marconi Infra-Red Limited, SO15 OEG Southampton, UK |
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Abstract: | By taking advantage of Auger suppression techniques, the leakage currents of room temperature infrared detectors operating
in the LWIR band can be greatly reduced. At present, these detectors suffer from large 1/f noise and hence the improvement
in the detectivity resulting from the reduced leakage currents can only be realized at high frequencies. However, this is
not a problem for heterodyne systems which employ intermediate frequencies above 40 MHz. A thermo-electrically cooled Auger
suppressed infrared detector operated at 260K has been studied as a heterodyne detector. The device was operated with the
application of sufficient local oscillator power to double its dark current (about 0.3 mW) and a NEP of 2 x 10-19 W Hz−1 was deduced from heterodyne measurements. The frequency response is presently limited by a combination of the detector capacitance
and the series resistance to about 70 MHz and ways to reduce this series resistance are considered. |
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Keywords: | Heterodyne detectors laser detectors MCT metalorganic vapor phase epitaxy (MOVPE) nonequilibrium |
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