Reduction of Backward Scatterings at the Low-Coherence Kunwu Laser Facility
Anle Lei, Ning Kang, Yao Zhao, Huiya Liu, Honghai An, Jun Xiong, Ruirong Wang, Zhiyong Xie, Yuchun Tu, Guoxiao Xu, Xichen Zhou, Zhiheng Fang, Wei Wang, Lan Xia, Wei Feng, Xiaohui Zhao, Lailin Ji, Yong Cui, Shenlei Zhou, Z. J. Liu, Chunyang Zheng, Lifeng Wang, Yanqi Gao, Xiuguang Huang, Sizu Fu
Abstract
We report the first experimental observation on the reduction of backward scatterings by an instantaneous broadband laser with 0.6% bandwidth in conditions of interest for inertial confinement fusion at the low-coherence Kunwu laser facility. The backscatter of stimulated Brillouin scattering (SBS) was robustly reduced by half at intensities of 1-5×10^{14} W/cm^{2} with the 0.53-μm broadband laser in comparison with the monochromatic laser. As SBS dominates energy loss of laser-plasma interactions, the reduction of that demonstrates the enhancement of laser-target coupling by the use of broadband laser. The mitigation of filamentation leads to the reduction of stimulated Raman backscattering at low intensities. In addition, the three-halves harmonic emission was reduced with the broadband laser as well.