Abstract
Higher harmonics in backscattered laser light from the CO 2 laser produced plasma were investigated. They were in the frequency range of (3/2)ω 0 and 2ω 0 , when TEA CO 2 laser light of the frequency ω 0 was focused on a carbon target. The threshold laser intensity of higher harmonics are 5×10 10 W/cm 2 . It coresponded to the threshold of Raman backscattering. One half frequency of the laser light was not observed at the present time.
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