Second Harmonic Stimulated Raman Scattering of Laser Radiation in a Plasma
نویسنده
چکیده
A high-power linearly polarized laser propagating through a plasma produces oscillatory electron velocity at the second harmonic due to the v x B force. This velocity couples a Langmuir wave (ui,k) and an electromagnetic wave (wi,fci), where w\ = LO 2u0 , fei = k — 2kQ and u>0, k0 are frequency and wavenumber of the laser pump, causing second harmonic Raman scattering. The growth rate is maximum for side scattering. This process can occur above the quarter critical density, unlike the first harmonic stimulated Raman scattering which occurs below the quarter critical density.
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