Second-Harmonic Generation of Laser Radiation in a Plasma with a Density Ripple
نویسندگان
چکیده
High-power laser radiation with frequency u>i and wave vector ktz propagating through a plasma at an angle to a density ripple (0, fco) produces current and density perturbation at (u>i ,ki + ko). The density perturbation couples with the oscillatory velocity at (wi, fci) to produce nonlinear current at [2^'1.(2 A-1 + k0)] driving second-harmonic electromagnetic radiation. For a specific value of ripple wave number k0 = kOc, the phase-matching conditions for the second-harmonic process are satisfied, leading to resonant enhancement in the efficiency of energy conversion. kOr decreases with the frequency ui\ of the laser.
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