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Deflection of Laser Light by an Acoustic Wave in a Magnetised Semiconductor with High Dielectric Constant
Author(s) -
Pragya D.,
Ghosh S.
Publication year - 1994
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221860123
Subject(s) - magnetic field , wavelength , physics , optics , laser , dielectric , amplitude , condensed matter physics , atomic physics , optoelectronics , quantum mechanics
An analytical investigation is made for the scattering of laser light by an acoustic wave propagating obliquely to the externally applied magnetic field in a doped solid state plasma with high dielectric constant, consequent amplification of scattered modes is also carried out. The origin of this nonlinear interaction lies in the second‐order optical susceptibility arising due to the nonlinear current density in the medium. The influence of carrier density is also considered. The threshold value of the pump electric field is obtained. It is found that the threshold pump amplitude required for the onset of instability may be reduced by increasing the doping level and decreasing the obliquity of the magnetic field to the propagation direction. The steady state growth rate is also obtained. The gain constant increases explosively with a little increment in cyclotron frequency after it touches its minimum at ω c ≈10 13 s −1 . The transmitted intensity of the scattered mode and the cell efficiency have also been decuded when the cell length is quite large compared to the pump wavelength. The transmitted intensity is found to have a maximum value when the magnetic field is applied at an angle of 60° to the photon propagation direction.