Ms. Mamta Singh Profile

Mamta Singh

at Univ of Delhi

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Proceedings Article | 15 June 2015 Paper

Plasma based optical guiding of an amplitude-modulated electromagnetic beam

Mamta Singh, D. Gupta

Proceedings Volume 9654, 96541R (2015) https://doi.org/10.1117/12.2182397

KEYWORDS: Plasma, Modulation, Amplitude modulation, Electromagnetism, Radio propagation, Laser beam propagation, Dielectrics, Pulsed laser operation, Diffraction, Electromagnetic radiation

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We propose the stronger optical guiding of an electromagnetic beam in a plasma by considering the amplitude modulation of the fundamental beam. With the advent of high power source of electromagnetic radiation, the electron velocity in a plasma may become quite large (comparable to the light velocity in free space). Thus, the effect of relativistic mass variation must be taken into account. The relativistic effect of the laser propagation in a plasma leads to self-focusing because of the dielectric constant of a plasma being an increasing function of the intensity. The ponderomotive force of the laser beam pushes the electrons out of the region of high intensity, which reduces the local electron density and increases the plasma dielectric function further, leading to even more selffocusing of the laser. In this work, we consider a short pulse laser of finite spot size as an amplitude modulation in time. Our findings show an efficient optical guiding mechanism based on amplitude modulation signal propagation in plasmas. Medium nonlinearity becomes stronger if an amplitude modulated beam is introduced, which contributes significantly in laser guiding in plasmas. Furthermore, the rate of laser self-focusing is increased with modulation index due the fact of stronger Kerr effect. The study related to amplitude modulated optical signal may be useful for communication technology.

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