摘要
利用包含喇曼增益、抽运消耗、自相位调制、交叉相位调制和群速度色散效应的耦合非线性薛定谔方程组,对千瓦级高功率纳秒脉冲在单模光纤中的传输特性进行了模拟计算.分析了输入脉冲和斯托克斯脉冲的演化过程,研究了大模面积光纤对受激喇曼散射的抑制作用.研究结果表明,采用模面积为530μm2的光子晶体光纤作为惯性约束聚变脉冲整形系统的传输介质,能有效抑制受激拉曼散射,不但信号衰减较小,而且中心凹陷程度较低.
The influence of stimulated Raman scattering （SRS） on high power （peak power - 1 000 W） pulse with a pulse-width of -1 ns propagating in a single-mode fiber is investigated numerically by solving coupled nonlinear Schr^Sdinger equations including Raman gain, pump depletion, self phase modulation, cross-phase modulation and group velocity dispersion. The evolution of input pulse and Stokes pulse is analyzed,and suppression of SRS using large mode area fiber is shown. The results show that SRS can be suppressed effectively when using photonic crystal fiber （PCF） as transmission medium for inertial confined fusion （ICF）. Compared to conventional single-mode fiber, the signal loss is smaller, and the central-dip in output pulse is lower.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2009年第12期3198-3202,共5页
Acta Photonica Sinica
基金
国家自然科学基金(60507001)
天津市科技发展基金(033800411)
天津大学青年教师基金资助
关键词
高功率纳秒脉冲
受激喇曼散射
大模面积光纤
非线性
High-power nanosecond optical pulse
Stimulated Raman scattering
Large mode area fiber
Nonlinearity
