SECOND HARMONIC LIGHT EMISSION FROM PLASMAS PRODUCED WITH SMOOTHED 1. 05μm LASER

Time-integrated spectra of second harmonic (2ω) light emission from plasmas produced with 1' 053μm laser are simultaneously measured at several scattering-angles on Xingguang Ⅱ laser facility. The spectra show that 2ω light is just due to resonance absorption, and ion-acoustic decay instability is suppressed. The mean velocity of critical surface and its variation during laser pulse are inferred from the spectra. Moreover, the relationship between scattered light intensity and scattering angle is also acquired.

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