多程放大系统前端脉冲经光纤传输引起的失真研究  

Research on the distortion resulted by propagation of the multi-pass amplifier system Front-End pulse in optical fibers

作　　者：顾艳华[1] 罗斌[2] 潘炜[2] 

机构地区：[1]南京信息职业技术学院通信工程系,江苏南京210046 [2]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《激光杂志》2007年第3期29-30,共2页Laser Journal

摘　　要：在高功率固体激光系统中,要求进入多程放大系统前端脉冲必须具有特定的时域波形以及线偏振的特性。本文以耦合非线性薛定谔方程为理论模型,采用分步傅立叶方法进行数值计算,仿真研究了满足特定要求的多程放大系统前端脉冲经光纤传输后引起失真的原因。结果表明:整形好的线偏振脉冲由于光纤中随机双折射的影响不能保持线偏振特性;高功率系统较强的非线性效应是导致两个偏振方向的脉冲波形发生畸变的重要因素。The pulse originated from the Front - End laser system must meet the specific temporal profile and linear polarization characteristic in high - power multi - pass amplifier system. Based on coupled nonlinear Schroedingar equation, the numerical solutions of pulse propagation in fibers were obtained with Split - step Fourier Method. The results show that： the pulse can＇t keep it＇s linear pularization state due to the randomly birefringence of the fibers, and thc strong non- linear effects in high - power system cause the distortion of the pulse at the two polarization direction.

关 键 词：多程放大系统 随机双折射 非线性效应 线偏振 

分 类 号：TN929.11[电子电信—通信与信息系统]