Backscatter light diagnosis with hohlraum on SG-Ⅲ prototype laser facility

To study the stimulated Brillouin scattering (SBS) and stimulated Raman scattering(SRS) light produced during the inertial confinement fusion (ICF) studies on SG-Ⅲ prototype laser facility, the spectra of scattered light from vacuum hohlraum and gas filled hohlraum are measured using a new backscatter light diagnostic system. Experimental results show that the gas filled hohlraums produce more SRS light than the vacuum hohlraums under the same experimental parameters. Meanwhile, the scattered light will be reduced with the application of smoothing into optical module. The temporal evolution of the intensity and spectra of the scattered light can be recorded by this new backscatter light diagnostic system, which is valuable for the studies of ICF.