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Stimulated Raman backscattering of filamented hollow Gaussian beams

  • Ram Kishor Singh (a1) and R.P. Sharma (a1)


This paper presents a model for excitation of electron plasma wave and resulting stimulated Raman scattering due to presence of a laser beam carrying null intensity in center (hollow Gaussian beam) in a collisionless plasma. We have studied the self-focusing of the hollow Gaussian beam and its effect on back stimulated Raman scattering process in the presence of ponderomotive nonlinearity. To understand the nature of propagation of the hollow Gaussian beam, electron plasma wave and back reflectivity, a paraxial-ray approximation has been invoked. It is predicted that self-focusing and back reflectivity reduces for higher order of hollow Gaussian beam.


Corresponding author

Address correspondence and reprint requests to: Ram Kishor Singh, Centre for Energy Studies, IIT Delhi, India110016. E-mail:


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Stimulated Raman backscattering of filamented hollow Gaussian beams

  • Ram Kishor Singh (a1) and R.P. Sharma (a1)


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