Second harmonic generation from the plasma density gradient induced by ponderomotive force was studied. Images of the second harmonic emission at the focal point, where the intensity was above 1017 W/cm2, were observed. These images strongly depended on the polarization of the pump pulse. The polarization of the second harmonic was the same as that of the pump pulse. Experimental results were well explained by the theoretical model.
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Mori et al. (2002) studied this question.
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