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Second harmonic generation of high power laser beam in cold quantum plasma
摘要： Second harmonic generation of high power laser beam in cold quantum plasma (CQP) is investigated in present communication. In order to derive 2nd order differential equations governing the behavior of laser beam against normalized distance, paraxial theory and WKB approximation are adopted. There is self-focusing of beam on account of relativistic increase in mass of electron, which further results in production of intensity gradients in transverse direction. The electron plasma wave (EPW) gets excited due to these intensity gradients at pump wave frequency. Further, there is an interaction of EPW with pump beam thereby producing second harmonics. In order to study the effect of various parameters of laser and plasma medium on self-focusing of pump beam and second harmonic yield, we have carried out numerical simulations. The comparison of present results is made with classical relativistic plasma (CRP).
关键词： Second harmonic yield,Cold quantum plasma,Electron plasma wave,Self-Focusing
更新于2025-09-16 10:30:52
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Effects of plasma electron temperature and magnetic field on the propagation dynamics of Gaussian laser beam in weakly relativistic cold quantum plasma
摘要： Self-focusing of Gaussian laser beam has been investigated in quantum plasma under the effect of applied axial magnetic field. The nonlinear differential equation has been derived for studying the variations in the beam-width parameter. The effect of initial plasma electron temperature and the axial magnetic field on self-focusing and normalized intensity are studied. Our investigation reveals that normalized intensity increases to tenfolds where quantum effects are dominant. The normalized intensity further increases to twelvefolds on increasing the magnetic field.
关键词： electron temperature,weakly relativistic,Gaussian,self-focusing,Cold quantum plasma
更新于2025-09-12 10:27:22