Amplification of Modulated Waves in Magnetoactive Semiconductor Plasmas

Anita Sangwan Anita Sangwan,Navneet Singh Navneet Singh

doi:10.17577/ijertv9is020236

Abstract

Amplification of Modulated Waves in Magnetoactive Semiconductor Plasmas

Highlights

Laser-semiconductor plasma interactions have been playing a prominent role in diverse areas of scientific research for several decades due to its immense applications in processing of materials and fabrication of devices [1, 2]
In order to establish the validity of present model, we have chosen a weakly-polar III-V semiconductor plasma at 77 K as the medium; it is assumed to be irradiated by a 10.6 μm (ω0 = 1.78 × 1014 s–1) pulsed CO2 laser
The analysis enables us to draw following conclusions: 1. The hydrodynamic model of semiconductor-plasma has been successfully applied to study the influence of different parameters such as externally applied magnetostatic field, doping concentration etc. on threshold pump amplitude and growth rate of modulated wave in magnetoactive semiconductor plasmas duly shined by slightly off-resonant not too high power pulsed lasers

Summary

Introduction

Laser-semiconductor plasma interactions have been playing a prominent role in diverse areas of scientific research for several decades due to its immense applications in processing of materials and fabrication of devices [1, 2]. Semiconductor plasmas provide a compact and less expansive medium to model nonlinear optical phenomena encountered in laser technology. In modulational interaction a strong space charge field modulates the pump wave [3]. Periodic variations of the propagation parameter lead to the modulation of an electromagnetic wave passing through the medium. The optical waves present in an electro-optic modulator can be strongly amplified through nonlinear optical pumping. The resulting amplification of decay channels by modulational interactions are generally referred to as an instability of wave propagating in nonlinear dispersive medium such that the steady-state becomes unstable and evolves into a temporally modulated state [4]

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Conclusion