正常色散区泵浦微结构光纤产生超连续谱研究  

Research on the supercontinuum generation in a microstructured fiber pumped at the normal dispersion region

作　　者：闫培光[1] 李乙钢[2] 吕可诚[2] 阮双琛[1] 郭春雨[1] 

机构地区：[1]深圳大学工程技术学院,深圳518060 [2]南开大学物理学院,天津300071

出　　处：《深圳大学学报（理工版）》2006年第1期21-24,共4页Journal of Shenzhen University(Science and Engineering)

基　　金：广东省自然科学基金项目(031809);广东省高校自然科学基金项目(Z02062);广东省"千百十"工程基金项目(Q02118)

摘　　要：用实验和数值模拟两种方法研究在正常色散区内用飞秒脉冲泵浦微结构光纤产生超连续谱的机理.研究发现,在初始阶段,自相位调制对光谱展宽起主要作用,连续谱平坦;当光谱展宽进入反常色散区后,拉曼效应和反常色散的作用使光谱分裂.泵浦波长在正常色散区内离零色散点越远,得到的超连续谱宽度越小,但其在正常色散区的部分光谱却更平坦.The mechanism of supercontinuum generation was experimentally and theoretically studied in a microstructured fiber when pumped at its normal dispersion region by using femtosecond laser pulses. Our work indicates that the self-phase modulation （SPM） effect is the fundamental mechanism at the initial stage, resulting in a flat continuum. However, when extended into the abnormal dispersion region, the continuum would be splitted due to the Raman effects and the abnormal dispersion. Moreover our experiment obtains that when the pump wavelength in the normal dispersion region lies ihrther from the zero-dispersion wavelength, the generated supercontinuum would be narrower, while the part of spectrum in the normal dispersion region would be flatter.

关 键 词：超连续谱 微结构光纤 色散 泵浦波长 

分 类 号：TN25[电子电信—物理电子学]