受激拉曼散射(stimulated Raman scattering,SRS)具有激光的特性,并且容易获取不同波长的激光,从而成为调谐激光频率的重要途径之一。然而,由于其转化效率低,限制了它的实际应用。金属纳米粒子具有很强的表面增强效应,曾被广泛地用于增强拉曼散射而获得良好的效果。本文提出将金属纳米粒子的这种性质用于增强SRS。把Au纳米粒子混合于拉曼介质丙酮中,以532 nm的纳秒脉冲激光作为激发光,研究了Au纳米粒子在丙酮中的浓度对丙酮SRS一阶Stokes光强的影响,并通过仿真计算对实验结果进行了解释和分析。

Stimulated Raman scattering (SRS) has been an important method in the tunable laser frequency since it has the characteristics of the laser beams and easily acquires different wavelengths.However,the practical application of SRS is limited because of its low conversion efficiency.Metal nanoparticles have been widely used in the surface-enhanced Raman scattering (SERS) as they have very strong surface enhancement effect.In this article,metal nanoparticles are employed to improve the conversion efficiency of SRS.Au nanoparticles are mixed in the Raman medium acetone,and the nanosecond pulse laser of 532 nm is used as the pump source of the SRS.The first Stokes intensity of the SRS evolving with the concentration of Au nanoparticles in acetone is studied,and the experimental results are explained and analyzed by simulated calculations.