CAJ | 학술논문

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530 μm~2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.
이용포함나만증익、추운소모、자상위조제、교차상위조제화군속도색산효응적우합비선성설정악방정조,대천와급고공솔납초맥충재단모광섬중적전수특성진행료모의계산.분석료수입맥충화사탁극사맥충적연화과정,연구료대모면적광섬대수격나만산사적억제작용.연구결과표명,채용모면적위530 μm~2적광자정체광섬작위관성약속취변맥충정형계통적전수개질,능유효억제수격랍만산사,불단신호쇠감교소,이차중심요함정도교저.
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dinger 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.