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Proceedings Paper

Single-photon-sensitive linear-mode APD ladar receiver developments
Author(s): George M. Williams; Madison A. Compton; Andrew S. Huntington
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Paper Abstract

New measurements are presented for multi-stage InGaAs avalanche photodiodes (APDs) which have the potential to perform GHz-rate single photon counting in linear mode. No increase in dark current was measured for an 11-device sample of 5-stage APDs following 717 hours of accelerated aging under bias at 50°C, during an initial lifetime study. Impulse response times of 0.45 ns, 0.9 ns, and 1.1 ns were measured directly for 6-, 8-, and 10-stage APDs, respectively, operated at a nominal gain of M=10. To assess the suitability of the technology for a NASA optical communications application, separate samples of 5-stage APDs were irradiated by 1- and 2-MeV protons at the University of Washington's Center for Experimental Nuclear Physics and Astrophysics (UW CENPA) and by 63.5-MeV protons at the University of California Davis, Crocker Nuclear Laboratory (UCD CNL). Good agreement between calculated non-ionizing energy loss (NIEL) and observed damage was found for the low-energy protons at fluences of 1010 and 1011 cm-2. A NIEL calculation successfully predicted the damage observed following a 5×1010 cm-2 dose of 63.5-MeV protons by extrapolating from 2 MeV data, which suggests that displacement damage is the dominant mechanism.

Paper Details

Date Published: 18 April 2008
PDF: 5 pages
Proc. SPIE 6950, Laser Radar Technology and Applications XIII, 69500Q (18 April 2008); doi: 10.1117/12.782570
Show Author Affiliations
George M. Williams, Voxtel Inc. (United States)
Madison A. Compton, Voxtel Inc. (United States)
Andrew S. Huntington, Voxtel Inc. (United States)


Published in SPIE Proceedings Vol. 6950:
Laser Radar Technology and Applications XIII
Monte D. Turner; Gary W. Kamerman, Editor(s)

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