Raman upshifted third harmonic generation of a laser in a plasma

Singh, Ranjeet; Tripathi, V. K.
November 2010
Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p112103
Academic Journal
The plasma wave produced in a stimulated Raman back scattering process in plasma is seen to be effective in the resonant Raman upshifted third harmonic generation of the same laser or of another laser of a slightly lower frequency. The process requires plasma density slightly lower than the quarter critical density corresponding to the first laser frequency. The electron density perturbation due to the plasma wave beats with the drift velocity imparted by the second harmonic ponderomotive force to produce a density perturbation at Raman upshifted second harmonic. This perturbation couples with the oscillatory electron velocity due to the laser to produce Raman upshifted third harmonic current density and radiation field. The phase matching condition in cold plasma is satisfied when a plasma density is quarter critical. Thermal effects lower the requisite electron density a bit. The energy conversion efficiency from the pump to the Raman upshifted third harmonic could be quite large when the laser intensity exceeds 1016 W/cm2. The plasma inhomogeneity, however, is a significant limiting factor.


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