熔融石英玻璃受激布里渊散射效应实验研究

Experimental research on stimulated Brillouin scattering in fused silica glass

以自行研制的大能量单纵单横电光调Q激光系统作为抽运源,在小尺寸(2cm×2cm×4cm)的熔融石英玻璃样品中实现了强烈发展的受激布里渊散射(SBS)过程,在工作介质无损伤的情况下,相位共轭波能量高达110mJ,反射率约为60%.还研究了SBS能量反射率与入射角之间的关系,证实了此前提出的“自供种子光(self-Stokes-seeding)”效应的存在.提出了双棒串接的构型,得到了更为高效的SBS过程.

Stimulated Brillouin scattering（SBS） is one of important nonlinear optical phenomena, which is widely used in the areas of phase conjugation, pulse compression and beam combination. In this paper, a single axial and single transverse mode Q switched laser system is used as pump source and SBS is investigated experimentally in small bulk fused silica. Damage free operation is observed with SBS reflectivity up to 60%. The self-Stokes-seeding effect, which has been reported elsewhere, is verified. To improve reflected energy and SBS efficiency, two SBS samples connected in series is configured, but the SBS reflectivity cannot exceed 60 % due to surface damage.