Priyanka Rawat and Gunjan Purohit
In this paper, stimulated Raman backscattering by an intense self-focused hollow Gaussian laser beam (carrying null intensity at the center) in a collisionless plasma has been investigated in the relativistic-ponderomotive regime. The effect of relativistic- ponderomotive self-focusing of an intense hollow Gaussian laser beam (HGLB) on the excitation of electron plasma wave (EPW) and resulting back stimulated Raman scattering have been studied, at relativistic laser power. A paraxial-ray and WKB approximations are used to obtain the coupled equations describing the propagation of the hollow Gaussian laser beam in plasma, excitation of electron plasma wave and SRS back reflectivity. The effects of the order (n) and the pump intensity (a) of HGLB on the focusing/defocusing and intensity of hollow Gaussian beam in plasma, amplitude of the excited electron plasma wave and the back reflectivity of SRS has been explored. It is observed that the parameters n and a play an imperative role in this scheme. The self-focusing of HGLB in plasma is enhances for higher values of n and a, which significantly affected the dynamics of the excitation of EPW and back reflectivity of SRS. The results show that the focusing of waves i. e. pump wave, EPW and scattered wave enhances the back reflectivity of SRS.
Keywords: Hollow Gaussian Laser beam, collisionless plasma, relativistic-ponderomotive nonlinearity, electron plasma wave, stimulated Raman backscattering
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Professor MS Sodha
|Professor Emeritus of IIT, Delhi and Visiting Professor Department of Education & Physics, Lucknow University (UP)
Prof. Mahendra Singh Sodha is presently Emeritus of IIT, Delhi and Visiting Professor Department of Education & Physics, Lucknow University (UP) and has worked in universities and industry in India, USA and Canada. He has served three universities as Vice-Chancellor and IIT Delhi as Professor, Head of Department, Dean, Deputy Director, etc. Prof. Sodha has been Ph.D thesis advisor to over seventy candidates who successfully completed the programme. He has published over 600 papers in international journals of repute in plasma physics, optics, semiconductors, energy, combustion and ballistics etc., in addition to authoring/editing eleven books. Prof. Sodha is a Fellow of Indian National Science Academy and National Academy of Sciences, India and has received S.S. Bhatnagar prize for physical science in 1974. The honour of Padmashri was conferred on Prof. Sodha by President of India in 2003.
Dr. Alireza Ganjovi
|Laser Research Department, Photonics Research Institute, Graduate University of Advanced Technology, Kerman, Iran
Dr. Alireza Ganjovi is an Assistant Professor in Department of laser research, photonics research institute, Graduate University of
Advanced Technology, Kerman, Iran. He obtained his Ph.D degree in
2008 in Indian Institute Technology, Kanpur, India and joined
department of laser research in February 2008, as a faculty member.
Since then, he worked on Plasma jets, Technological applications of
plasma discharge, Laser Plasma interactions, Plasma discharge
modeling and simulations and etc. He has authored/co-authored more
than 70 refereed journal and conference papers. Under his
supervision, more than 40 Master and Ph.D students in the field of
plasma technology are graduated.
|Department of Physics, Lovely Professional University, Punjab, India
Dr. Niti Kant is an Associate Professor in Department of Physics. He obtained his Ph.D degree in 2005 in IIT Delhi, India and joined LPU in August 2007. During 2005-2007 he worked at IIT Delhi as a Project scientist in DST funded project and at POSTECH, South Korea as a Postdoc Researcher. He has authored/co-authored more than 50 refereed journal papers, 1 book chapters, 1 book and has made more than 10 oral/invited presentation in the national and international conferences. His research work has obtained more than 500 citations with H index of 13. His research interest includes: Self-focusing of laser, Harmonic generation, THz radiation and Particle acceleration etc.;
Dr. Meng Yang
MENG YANG is major in civil engineering special for hydraulic Engineering and hydrology-water resources and does research in State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai
University in China. He has obtained more than 50 patents covering five countries, which have produced huge social and economic benefits. Meanwhile he has published more than 20 important articles including several Top papers. He also works as the reviewers for different SCI journals, such as the Journal of Civil Engineering. He also works as one of the Editorial Board Members in“Journal of Civil, Construction and Environmental Engineering and the Editorial Board Member of the International Journal of Wireless Communication and Sensor
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