激光与光电子学进展, 2011, 48 (7): 071402, 网络出版: 2011-05-09
斯托克斯光种子法固体相干反斯托克斯拉曼频移器的理论研究
Theoretical Research on Coherent Anti-Stokes Raman Shifters of Stokes Seed Method in Raman Crystals
激光器 相干反斯托克斯 斯托克斯光种子法 固体拉曼激光器 脉冲抽运 相位失配 lasers coherence anti-Stokes Stokes seed injection solid-state Raman lasers pulse pumping phase mismatch
摘要
以波动方程和受激拉曼散射(SRS)物质方程为基础,采用光种子法,建立了固体相干反斯托克斯拉曼频移器的归一化耦合波方程,研究了晶体中反斯托克斯光转换效率。在脉冲抽运条件下分析了归一化增益系数G、归一化相位失配系数ΔK以及一阶斯托克斯光种子的归一化光场振幅ψs0三个变量对固体相干反斯托克斯拉曼频移器的影响,并作出了一系列相应曲线,由所得曲线估算了各归一化变量的合理取值范围。分析结果表明,在ΔK=0时,通过增大ψs0来打破拉曼增益抑制的影响,其转换效率峰值可达到44%。而当ψs0较弱时,可选取合适的相位失配系数,反斯托克斯光转换效率可达40%。
Abstract
Based on the wave equation and stimulated Raman scattering (SRS) material equations, the normalized coupled-wave equations for solid-state coherent anti-Stokes Raman shifters are deduced by Stokes seed method to research the anti-Stokes conversion efficiency. The numerical calculations are carried out to illustrate the effects of variables on the performance of solid-state coherent anti-Stokes Raman shifters in the pulse pumping regime, and several curves are generated. These variables include the normalized Raman gain G, the normalized phase mismatch ΔK and the normalized amplitude of the Stokes seed beam ψs0. The values of these variables are estimated from these curves. The results show that the highest anti-Stokes conversion efficiency of 44% can be achieved by enhancing ψs0 when phase is matched. The anti-Stokes conversion efficiency of 40% can be achieved with the weak Stokes seed beam when the proper phase mismatch is chosen.
林绍杰, 丁双红, 张骏, 王淑梅. 斯托克斯光种子法固体相干反斯托克斯拉曼频移器的理论研究[J]. 激光与光电子学进展, 2011, 48(7): 071402. Lin Shaojie, Ding Shuanghong, Zhang Jun, Wang Shumei. Theoretical Research on Coherent Anti-Stokes Raman Shifters of Stokes Seed Method in Raman Crystals[J]. Laser & Optoelectronics Progress, 2011, 48(7): 071402.