Parametric Amplification in Magnetized Nondegenerate Semiconducting Plasmas

K.L. Jat, A. Neogi and S. Ghosh School of Studies in Physics, Vikram University, Ujjain 456010, India

Received: October 23, 1989; in final version September 10, 1990

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Using the straightforward coupled-mode theory, the parametric amplification is analytically investigated in magnetized piezoelectric as well as non-piezoelectric semiconductors. The origin of nonlinear interaction is taken to be in the second-order optical susceptibility χ(2) arising from the nonlinear induced current density. The threshold value of the pump electric field E0th is obtained for crystals. E0th is found to decrease with the rise in magnetic field and fall with the rise in scattering angle. Parametric gain constants are obtained for different situations of practical interest, i.e. (i) for piezoelectric coupling only gp, (ii) for deformation potential coupling only gd, (iii) for both the couplings gb. Numerical investigations reveal that the magnetic field increases the gain. Maximum gains are obtained for backward scattered mode. gd is always found to be less than gp and gb. It is also found that gp and gb both are identical up to k ≈ x 107m-1 and for k ≥ 3 x 107m-1, gb exceeds gp.

DOI: 10.12693/APhysPolA.79.829 PACS numbers: 42.65.Ky, 72.20.Ht, 73.50.Rb, 78.20.Hp