Convective amplification of parametrically generated acoustic wave in a piezoelectric semiconductor plasma |
| |
Authors: | G. Sharma S.K. Ghosh |
| |
Affiliation: | (1) School of Studies in Physics, Vikram University, Ujjain-456 010 (M.P.), India, IN |
| |
Abstract: | Using hydrodynamic model of semiconductor plasmas and coupled-mode theory of interacting waves, we have analytically investigated parametric interaction in a magnetised piezoelectric semiconductor plasma in non-relativistic domain. The temperature dependence of momentum transfer collision frequency of electrons due to their heating by the pump is assumed to induce nonlinearity in the medium. We have derived a dispersion relation which finally gives four unstable acoustic modes; two forward amplifying modes and two backscattered attenuating modes. We have also obtained an expression for the critical pump amplitude ( ) at and around which gains and phase velocities of amplifying acoustic modes become least dependent on the pump amplitude and static magnetic field . The required can be readily obtained from a pulsed 10.6 μm CO2 laser. The magnetic field is found to shift the critical point towards lower pump amplitudes. Received 5 September 2000 and Received in final form 5 March 2001 |
| |
Keywords: | PACS. 72.30.+q High-frequency effects plasma effects – 52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) – 72.55.+s Magnetoacoustic effects |
本文献已被 SpringerLink 等数据库收录! |
|