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Proceedings Paper

Developments in HgCdTe avalanche photodiode technology and applications
Author(s): Andrew Ashcroft; Ian Baker
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Paper Abstract

SELEX Galileo has developed avalanche photodiode technology in HgCdTe to serve a whole range of applications in defence, security, commercial and space research. Burst-illumination LIDAR (BIL), using a near-infrared pulse laser and a fast, gated detector, is now adopted for most long range imaging applications. New results from range trials using prototype systems based on multifunctional and 3D detectors are reported. In the astronomy field, APD arrays at 2.5 μm cutoff can provide near-single photon sensitivity for future wavefront sensors and interferometric applications. Under a contract from European Southern Observatories arrays have been successfully demonstrated with gains up to 20× and negligible dark current at 77K. Under a European Space Agency contract, a large area, single element detector has been designed for the 2.015μm CO2 absorption line. The sensor is specifically designed to be operated at 200K so that thermoelectric cooling is viable. The element is made up of many sub-pixel diodes each deselectable to ensure high breakdown in the macro-pixel. The latest results of the detector and its associated transimpedance amplifier (TIA) are presented.

Paper Details

Date Published: 3 May 2010
PDF: 9 pages
Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76603C (3 May 2010); doi: 10.1117/12.850133
Show Author Affiliations
Andrew Ashcroft, SELEX Galileo Infrared Ltd. (United Kingdom)
Ian Baker, SELEX Galileo Infrared Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 7660:
Infrared Technology and Applications XXXVI
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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