11 September 1989 High Temperature IR Absorption Of Low Resistivity Germanium
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Abstract
Germanium is extensively used in fabricating infrared optical elements. Its excellent mechanical, optical and electrical properties, along with its moderate cost and availability in large sizes, make it attractive in many aerospace applications. Its primary limitation in these applications is free carrier absorption, which limits its utility to thermal environments where the temperature does not exceed 200°F. Free carrier absorption can be controlled to a limited extent by doping of the material, allowing optimization for a given thermal environment. This paper presents the results of a recent effort to characterize the infrared absorption of low resistivity germanium over temperatures ranging from 0°F to 250°F. A computational model of germanium absorption in the long-wave infrared (LWIR) is compared with measured data.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. A. Osmer, C. J. Pruszynski, J. Richter, "High Temperature IR Absorption Of Low Resistivity Germanium", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960767; https://doi.org/10.1117/12.960767
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