CAJ | 학술논문

基于描述脉冲放大过程的时间相关非线性辐射迁移方程,对不同形状脉冲经掺镱光纤放大器传输后的功率特性进行了分析,该方程同时考虑了光与介质的相互作用.数值结果表明,在相同的脉冲能量下,不同形状脉冲经放大器放大后的功率增益随入射脉冲形状不同而不同,并且功率增益的差异在脉冲前沿比较大.这使得放大器输出脉冲峰值向前沿的偏移量以及峰值功率的放大倍数都与脉冲形状有关.尤其是当入射脉冲的能量较大时,不同形状脉冲的峰值功率的放大倍数明显不同,以超高斯脉冲为最大,高斯脉冲、双曲正割脉冲次之,洛伦兹脉冲最小.
기우묘술맥충방대과정적시간상관비선성복사천이방정,대불동형상맥충경참의광섬방대기전수후적공솔특성진행료분석,해방정동시고필료광여개질적상호작용.수치결과표명,재상동적맥충능량하,불동형상맥충경방대기방대후적공솔증익수입사맥충형상불동이불동,병차공솔증익적차이재맥충전연비교대.저사득방대기수출맥충봉치향전연적편이량이급봉치공솔적방대배수도여맥충형상유관.우기시당입사맥충적능량교대시,불동형상맥충적봉치공솔적방대배수명현불동,이초고사맥충위최대,고사맥충、쌍곡정할맥충차지,락륜자맥충최소.
Based on the nonlinear,time-dependent radiation transfer equations,which describe the amplification process of a pulse and account for the effect of the radiation on the medium and vice versa,the power characteristics of the output pulses of a Yb-doped fiber amplifier are investigated under different input pulse shapes.Numerical results show that,the power gain of the pulse traversing the amplifier is different for different shapes when the average energy of the input pulse is the same.This difference is larger in the leading part of the pulse,which leads both the gain value and the shift value of the peak power for the output pulses to be dependent on the input pulse shape.Especially,when the input pulse energy is relatively large,the gain of the peak power for different pulses is obviously different; with Super Gaussian pulse the largest followed by Gaussian pulse and Hyperbolic-Secant pulse and Lorentzian pulse the smallest.