Dynamical theory for optical coherent transients in solids: fast and ultrafast optical dephasing

Equations for the density matrix are used to calculate both coherent optical effects (OFID, 2PE and 3PE) and incoherent effect (hole-burning). The equations take into account that optical bands in solid consist of zero-phonon line (ZPL) and phonon-side band (PSB), and PSB in absorption and fluoresce...

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Bibliographic Details
Published in:Journal of luminescence 1993-10, Vol.56 (1), p.197-208
Main Author: Osad'ko, I.S.
Format: Article
Language:English
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Summary:Equations for the density matrix are used to calculate both coherent optical effects (OFID, 2PE and 3PE) and incoherent effect (hole-burning). The equations take into account that optical bands in solid consist of zero-phonon line (ZPL) and phonon-side band (PSB), and PSB in absorption and fluorescence spectra are not in resonance with each other. It is shown that the expression for the echo-signal has both pure exponential term (fast dephasing) and non-exponential term (ultrafast dephasing). The Fourier transformation cannot relate ultrafast echo decay to the hole shape function. The formulae of the dynamical theory for OFID, 2PE and 3PE are compared to the formulae of stochastic theories. Excitation by non-monochromatic laser pulse whose spectral width exceeds one of the optical band is considered.
ISSN:0022-2313
1872-7883
DOI:10.1016/0022-2313(93)90071-T