飞秒级超短脉冲光参量转换效率及脉冲特征计算  

Calculation of the Conversion Efficiency and Characteristics of Output Pulse of Ultrashort-pulse Optical Parametric Generation

作　　者：李旭[1] 朱振和[2] 顾涛[3] 孙雨南[1] 

机构地区：[1]北京理工大学信息科学技术学院,北京100081 [2]中央民族大学,北京100081 [3]华北科技学院,北京101601

出　　处：《激光与红外》2005年第4期241-245,共5页Laser & Infrared

摘　　要：建立了超短脉冲光参量产生过程的理论模型,数值求解耦合波方程组,研究了在飞秒级超短脉冲的光参量产生过程中,泵浦光的强度和脉宽对转换效率、输出脉冲的宽度和不对称度的影响。结果表明:泵浦光越强,光参量产生的转换效率越高,同时脉宽的压窄效应越明显;泵浦光的脉宽越窄,GVM参数和IGVD参数就越大,导致转换效率下降,同时引起输出脉冲的脉宽变大和波形的对称性变差。The coupled wave equations for ultrashort-pulse optical parametric generation(OPG) are deduced and numerically solved.The influence of the intensity and the duration of pump pulse on the characteristics of ultrashort-pulse OPG are theoretically studied.Our calculation results show that the conversion efficiency of OPG and the features of the generated pulses are greatly affected by the intensity and the duration of pump pulse.The stronger the pump intensity,the higher the conversion efficiency of OPG,and the narrower the signal pulse duration.The narrower the pump pulse duration,the greater the parameters of GVM (group-velocity mismatch among three pulses) and IGVD(intrapulse group-velocity dispersion),the lower the conversion efficiency of OPG and the larger the duration and asymmetry degree of signal pulse.

关 键 词：光参量产生 飞秒 转换效率 信号光脉宽 脉冲的不对称性 

分 类 号：TN241[电子电信—物理电子学]