Full aperture backscatter diagnosis system on Shenguang prototype laser facility

Full aperture backscatter station on Shenguang Prototype laser facility is reported. Large aperture and long focus Fresnel lens is designed for collecting the scattering light in the view of the laser beam focusing lens. The nonlinear scatter signals have separated from background light from laser optical mirrors in space by employing vacuum space filter. The scatter light energy and spectrum of the full aperture backscatter have measured in the hohlraum experimental on SG laser facility simultaneously. This offered possible important reference for exactitude energy balance of laser coupling. (authors)