Analysis of resonant hyper-Raman scattering of light by LO phonons in a CdS crystal
Ludmila E. Semenova; Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
Abstract
This work is dedicated to a theoretical analysis of previously observed hyper-Raman scattering (HRS) of light in a CdS crystal, the intensity of which increased when the doubled frequency of the exciting radiation approaches the region of exciton resonances [V.A. Maslov, and et al, Laser Phys., 6, 132 (1996)]. The scattering process was considered within the framework of the excitonic model, taking into account the valence band wave functions obtained by Gutsche and Jahne [E. Gusche and E. Jahne, Phys. Status Solidi, 19, 823 (1967)]. In doing so, allowance was made for the Fröhlich mechanism of the exciton-lattice interaction. For the scattering geometry used in the experiment, the contributions to resonant HRS can be made by the sequences of the intermediate excitonic states, s-p-s, and the scattering processes including two-photon dipole transitions to s-excitons belonging to the A, B and C series. It has been shown that the calculated frequency dependence of the scattering cross section, under certain conditions, can be in agreement with the observed increase in the HRS intensity upon excitation below excitonic resonances.
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Ludmila E. Semenova
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russia
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