APPLICATION OF A WARM APERTURE DIAPHRAGM IN COOLED SMALL-FORMAT MATRIX PHOTODETECTORS
P. P. Dobrovolsky, I. I. Kremis, S. V. Khryaschev, A. R. Novoselov, S. M. Churilov
Technological Design Institute of Applied Microelectronics, United Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: aperture diaphragm, cryostat, matrix photodetector, photodetector based on mercury-cadmium-tellurium structures
Abstract
Designs of a warm (uncooled) aperture diaphragm in a gas-filled cryostat with a matrix photodetector sensitive in the infrared spectral range are studied numerically and experimentally. It is shown that the matrix photodetector with a format of 384 × 288 pixels is cooled with liquid nitrogen to operating temperatures (85 K) in less than 40 seconds if the chosen design of a warm aperture diaphragm is used and in 15 seconds in the case with a throttle microcooler, while maintaining the standard sensitivity of photodetectors based on mercury-cadmium-tellurium (MCT) structures.
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