Polarizations of 3/2 omega0and linearly as well as parametrically excited 2 omega0emissions from laser plasmas were measured, using a 20 J-5 ns, Nd:glass, s- and p-polarized laser. It was observed that, although the polarizations of 3/2 omega0and linearly excited 2 omega0emissions showed a significant departure, with the emissions excited by p-polarized light being in a completely unpolarized state, whereas those excited by an s-polarized pump showed a much higher degree of alignment. The unpolarization of the harmonic emissions has been explained on the basis of diffuse scattering of the plasmons or the plasma turbulence.
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