Full aperture backscatter signal analysis of laser with hohlraum on Shenguang Ⅱ laser facility

Full aperture backscatter system and experimental measurement of hohlraum with 351 nm wavelength laser on Shenguang Ⅱ laser facility is reported. FABS optical path has been analyzed and the backscattering light completely entried FABS collecting optical path. FABS existed the background light when the eight beams symmetrically acted on hohlraum. The background light is composed of 526.5 nm and 1 053 nm wavelength remains while the 1 053 nm wavelength changes into 351 nm wavelength, according to records of laser sensitive paper and optical filter. The background light accounts for 15% of FABS energy from experimental measurement result.