中国激光, 2020, 47 (3): 0301001, 网络出版: 2020-03-12
外腔泵浦反斯托克斯激光器的耦合波理论 下载: 762次
Coupled Wave Theory of Extra-Cavity Pumped Anti-Stokes Lasers
激光器 反斯托克斯散射 四波混频 外腔泵浦 耦合波方程 归一化理论 lasers anti-Stokes scattering four-wave mixing extra-cavity pumping coupled wave equation normalization theory
摘要
在平面波近似下,由波动方程和拉曼介质的物质方程出发,忽略受激拉曼散射的瞬态效应,得到了描述外腔泵浦反斯托克斯激光器中一阶反斯托克斯光、泵浦光和一至三阶斯托克斯光相互作用的耦合波方程。引入归一化参量对方程组进行归一化处理,通过对归一化耦合波方程组进行数值求解,分析了归一化拉曼增益系数、归一化泵浦脉冲宽度和归一化波失配对外腔泵浦反斯托克斯激光器性能的影响。将实验数据代入耦合波方程中进行了验证,理论估算出的反斯托克斯光转化效率与文献报道数据基本一致,证明了该理论模型的正确性。通过分析理论计算结果提出了提高外腔泵浦反斯托克斯激光器转化效率的途径及辅助激光器设计的方法。
Abstract
In this study, based on the wave equation and material equation of a solid Raman medium and neglecting the transient effect of stimulated Raman scattering, the coupled wave equations of the interaction of the first anti-Stokes beams, the pump, and first to third Stokes beams in extra-cavity pumped anti-Stokes lasers are obtained using the plane wave approximation. Normalized parameters are introduced to normalize the equations. The effects of the normalized Raman gain coefficient, normalized pump pulse width, and normalized wave mismatch on the performances of extra-cavity pumped anti-Stokes lasers are analyzed by numerically solving the normalized coupled wave equations. The experimental data are substituted into the coupled wave equations. The theoretical estimations of the anti-Stokes optical conversion efficiencies are consistent with the reported data, which validate the correctness of the theoretical model. By analyzing the theoretical calculation results, methods to improve the conversion efficiency of extra-cavity pumped anti-Stokes lasers and associated methods of lasers design are proposed.
王聪, 吕冬翔. 外腔泵浦反斯托克斯激光器的耦合波理论[J]. 中国激光, 2020, 47(3): 0301001. Wang Cong, Lü Dongxiang. Coupled Wave Theory of Extra-Cavity Pumped Anti-Stokes Lasers[J]. Chinese Journal of Lasers, 2020, 47(3): 0301001.