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- W1987133069 abstract "We have found experimentally the IR-induced second harmonic generation (SHG) in glasses possessing different degrees of electron−phonon interactions. For the investigations, we have chosen As1-xBixTe3−CaBr2−PbBr2 (0 < x <1) glasses. General formalism is based on consideration of fifth-order nonlinear optical susceptibility. The effect is observed in the middle IR region (spectral range 0.92−10.5 μm) where the value of the electronic energy gap is commensurable to the energies of actual quasi-phonons participating in the anharmonic (non-centrosymmetric) electron−phonon interactions. Varying the As/Bi ratio allows us to operate by the degree of electron−phonon anharmonicity in a wide spectral range. The second harmonic generation (SHG) output signal shows a correlation with IR-induced anharmonic phonon modes within the 1.5−4.8 μm spectral range. A maximum value of SHG is achieved at pump−probe delaying times of about 12.5−20 ps, which are typical for relaxation of the anharmonic electron−quasi-phonon subsystem. The maximally achieved value of the phonon-assisted optical susceptibility was about 6 × 10-38 m4/V.4 The SHG signal was saturated for the IR pump power densities of about 1.73 GW/cm2, corresponding to output SHG signals of about 9.8 × 10-4 with respect to the fundamental ones. By varying the degree of electron−phonon anharmonicity and changing content of glasses, it was unambiguously shown that the IR-induced SHG signal correlates well with changes of oscillator strengths of IR-induced anharmonic phonon modes." @default.
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- W1987133069 date "2005-01-22" @default.
- W1987133069 modified "2023-09-25" @default.
- W1987133069 title "Phonon-Assisted Second Harmonic Generation in As1-xBixTe3−CaBr2−PbBr2 Glasses" @default.
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- W1987133069 doi "https://doi.org/10.1021/jp046488y" @default.
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