Exciton absorption and optical-gain bands in the presence of laser radiation |
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| Authors: | S A Moskalenko V G Pavlov V R Mis’ko |
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| Institution: | (1) Institute of Applied Physics, Moldovan Academy of Sciences, MD-2028 Kishinev, Moldova |
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| Abstract: | The absorption and gain bands of a weak probe signal in the presence of the Bose-Einstein condensation of excitons, which
appears under nonequilibrium conditions in a field of coherent laser radiation, are considered. It is shown that the absorption
of light is caused by a quantum transition from the ground state of the crystal to the quasiexciton branch of the spectrum.
Amplification of the signal occurs as a result of transitions from the quasiexciton branch of the spectrum to the ground state
of the crystal.
Fiz. Tverd. Tela (St. Petersburg) 40, 924–927 (May 1998) |
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