Minimization of IR absorption by germanium at elevated temperatures

Jroy C. Richter; Charles R. Poznich; Dennis W. Thomas

doi:10.1117/12.22488

1 October 1990 Minimization of IR absorption by germanium at elevated temperatures

Jroy C. Richter, Charles R. Poznich, Dennis W. Thomas

Proceedings Volume 1326, Window and Dome Technologies and Materials II; (1990) https://doi.org/10.1117/12.22488
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

It has previously been determined that absorption of infrared radiation in germanium due to free carriers can be controlled to some extent by doping. As a result, the use of germanium in infrared systems can be extended to thermal environments not possible before. This can be accomplished by using lower resistivity germanium at elevated temperatures instead of the standard optical grade germanium used near room temperature (25°). In this work, the absorption of 3 to 11.9 tm radiation by germanium of various resistivities was determined at several discrete temperatures from room temperature to 120°C. The germanium samples ranged in resistivity from 0.1 to 40 ohm-cm. The data from these measurements were used to formulate graphical representations of the relationships between room temperature resistivity, absorption coefficient, wavelength and temperature.

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Jroy C. Richter, Charles R. Poznich, and Dennis W. Thomas "Minimization of IR absorption by germanium at elevated temperatures", Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); https://doi.org/10.1117/12.22488

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