HgCdTe Photodiodes For Heterodyne Applications

P M Henry; J K Powers; R L Rawe; H B. Morris

doi:10.1117/12.938667

6 October 1986 HgCdTe Photodiodes For Heterodyne Applications

P M Henry, J K Powers, R L Rawe, H B. Morris

Proceedings Volume 0663, Laser Radar Technology and Applications I; (1986) https://doi.org/10.1117/12.938667
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

The use of Mercury Cadmium Tellurium photodetectors in CO2 laser radar systems has been of interest for many years. In this paper we will describe data on our long wave infrared photodiode detectors for use in 10.6 μm heterodyne laser receivers which operate at 78 K with bandwidths up to 1 GHz. Performance data on these diodes at 78 K will be presented. Typical measured dc characteristics are quantum efficiencies greater than 60% at 10.6 μm a spectral response optimized for CO2 laser radiation, RA products greater than 120 Ω-cm2 at 50 mV reverse bias and breakdown voltages greater than 1.5 volt. The frequency response of these devices is limited by the dewar and preamp characteristics and is typically greater than 1 GHz. The heterodyne NEP is within a factor 1.5 of the quantum limit. Heterodyne NEP data as a function of local oscillator power, bias voltage and frequency are presented. These data will be compared with a heterodyne device/equivalent circuit model. Device model predictions of junction resistance and capacitance are made and the relevance to heterodyne operation is discussed. Theoretical predictions are compared to measured data and the implied device physics is discussed.

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P M Henry, J K Powers, R L Rawe, and H B. Morris "HgCdTe Photodiodes For Heterodyne Applications", Proc. SPIE 0663, Laser Radar Technology and Applications I, (6 October 1986); https://doi.org/10.1117/12.938667

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