ENERGY TRANSFER BETWEEN TWO CROSSED LASER BEAMS IN A PLASMA
Deepak Tripathi 1, R. Uma 1 and V. K. Tripathi 2
1 Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016, India
2 Department of physics, Indian Institute of Technology Delhi, New Delhi-110016, India
Abstract. The energy transfer between two crossed laser beams, through the coupling with an ion-acoustic
wave in a plasma is studied. The large amplitude laser beam couples with the density
perturbation associated with the ion acoustic mode, producing a nonlinear current and amplifying
the low amplitude beam. The two laser beams exerts a ponderomotive force on electrons,
affecting the ion acoustic wave. Efficient energy transfer to the probe beam occurs when the
phase matching conditions are satisfied. When a finite mismatch between the lasers and the low
frequency mode/ quasimode exists, still a significant energy transfer is possible. The theoretical
results are in compliance with the published experimental results.
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