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A line at the subharmonic frequency omega 0 /2 has been detected in the radiation backscattered from plasmas produced by irradiation of plane targets with a neodymium laser. The dependence of the threshold irradiance on the density scale length over the range 10 12 to 10 15 W cm -2 has been determined.
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Elazar et al. (1981) studied this question.
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