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.
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E. Yu. Perlin, A. V. Ivanov, and A. A. Popov, Opt. Spektrosk. 113(4), 376 (2012).
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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.
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Perlin, E.Y., Ivanov, A.V. & Popov, A.A. Interband phototransitions involving free electrons: Part II. Crystals with an indirect band gap. Opt. Spectrosc. 113, 383–387 (2012). https://doi.org/10.1134/S0030400X12100086
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DOI: https://doi.org/10.1134/S0030400X12100086