, Volume 113, Issue 4, pp 383-387
Date: 25 Oct 2012

Interband phototransitions involving free electrons: Part II. Crystals with an indirect band gap

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Abstract

Nonlinear absorption of laser radiation with a photon energy lower than the indirect band gap of crystal has been considered. It is shown that, as in the case of direct-gap materials, single-photon resonance at the transitions between two conduction bands even at radiation intensities j ∼ 105–106 W/cm2 yields a range of j values where optical absorption and concentration of nonequilibrium electron-hole pairs increase very sharply with an increase in j.

Original Russian Text © E.Yu. Perlin, A.V. Ivanov, A.A. Popov, 2012, published in Optika i Spektroskopiya, 2012, Vol. 113, No. 4, pp. 426–430.