开发了神光III主机装置上的背向散射诊断技术。采用非球面金属镜配空间滤波器的方式将倍频晶体返回的杂散光滤除，采用矩形小孔将楔形打靶透镜带来的宽光谱色散影响消除，采用大光斑配白光标定的方式获得整个背向散射系统的谱透射率，最终可实现定量化的背向散射光能量诊断。通过适当的光路设计，可实现背向散射受激布里渊散射光(SBS)和受激拉曼散射光(SRS)的光谱和时间过程测量。通过已有的实验数据可知，该技术已经初步具备了这方面的能力。

The backscattered light diagnostic technique has been developed on Shen Guang-III laser facility. After using three improvements, the backscattered light can be measured quantitatively. With the rectangle hole, the dispersion effect caused by the wedge lens can be removed. With the full aperture light and white light, the transmission of the backscattered diagnostic system can be obtained. After optimizing the diagnostic system, the spectrum and time process of stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) can be achieved. From the experimental data, the backscattered light diagnostic technique on Shen Guang-III laser facility has the primary ability to investigate the effect of laser and plasma interaction (LPI) and laser smooth technique.