THE EXPERIMENTAL OBSERVATION OF HOT ELECTRONS PRODUCED BY LASER OF 0.53μm WAVELENGTH

This paper introduces the experimental result and analysis of the hot electrons which are produced when gold-disk targets and gold hohlraum targets are irradiated by laser beams with wavelength 0.53pm, pulse width t about 75Ops and energy 60~ 230J (target surface laser intensity several by 10¹³~5×10¹⁵w/cm²) at the "Shen Guang-I^#" facility.The hard X-ray spectra and the X-ray flux above lOkeV were meas- ured. The results show that hot electron amount produced by laser of 0.S3pm wavelength less than one of 1.053μm about one order of magnitude; both of hot electron temperature T_h, and thermal electron temperature T_e,reduce about one half, SRS energy decreases about two order of magnitude, under our experimental conditions. First probably two - plasma decay (TPD) and resonance absorption are the primary mechanism for producing hot electrons on gold-disk targets (L<10O μm) and next SRS (n<n_c/4). First probable TPD is the primary mechanism for producing hot electrons in Au disk targets (10Oμmμm) and next SRS (n<n_c/4). SRS is the primary mechanism for producing hot electrons in hohlraum targets (L>30O μm).