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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2005. V. 8, N 3. P. 012-015.
Anisotropy and non-linearity of absorption of intensive IR light
by free electrons in germanium
Institute of Physics, NAS of Ukraine, 46, prospect Nauky, 03028 Kyiv, Ukraine
Fax: (38 044) 525-15-89, e-mail: poroshin@iop.kiev.ua
Abstract. The anisotropy and non-linearity of absorption of the intensive CO2 laser
radiation by free electrons in germanium has been found. The effect is caused by
redistribution of electrons among equivalent valleys occurring due to non-equal heating
electrons in the valleys which have different orientation in regard to the electric field of
the light wave.
Keywords: multivalley semiconductors, light absorption by free carriers, anisotropy,
non-linearity, heating carriers, intervalley redistribution.
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