Investigation of wave breaking in the normal dispersion region of nano-structured photonic crystal fibers  

作　　者：张磊 李曙光 付博 姚艳艳 张美艳 尹国冰 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,College of Science,Yanshan University

出　　处：《Optoelectronics Letters》2010年第6期401-405,共5页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 10874145);the China Postdoctoral Science Foundation(Nos. 20080440014 and 200902046);the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20091333110010);the Natural Science Foundation of Hebei Province (No. F2009000481)

摘　　要：The propagation of femtosecond laser pulses with wavelengths of 1550 nm, 1064 nm, 800 nm and 700 nm, respectively, which are in the normal dispersion region of the nano-structured photonic crystal fiber (N-PCF) with interesting broadband normal dispersion and highly nonlinear properties, is studied. For the effect of chirp variation mainly induced by group velocity dispersion (GVD) and self-phase modulation (SPM), after propagation over a short length, the wave breaking occurs. Namely, oscillatory structures are presented near pulse edges and sidelobes appear in the pulse spectrum. In the case of 800 nm, after the propagation of 20 mm, a super flat spectrum is obtained. The bandwidth of the super flat spectrum is associated with the dispersion length and the nonlinear length. By choosing N-PCF and laser pulse with appropriate parameters, a broadband super flat spectrum in a short length can be achieved.The propagation of femtosecond laser pulses with wavelengths of 1550 nm, 1064 nm, 800 nm and 700 nm, respectively, which are in the normal dispersion region of the nano-structured photonic crystal fiber （N-PCF） with interesting broadband normal dispersion and highly nonlinear properties, is studied. For the effect of chirp variation mainly induced by group velocity dispersion （GVD） and self-phase modulation （SPM）, after propagation over a short length, the wave breaking occurs. Namely, oscillatory structures are presented near pulse edges and sidelobes appear in the pulse spectrum. In the case of 800 nm, after the propagation of 20 mm, a super flat spectrum is obtained. The bandwidth of the super flat spectrum is associated with the dispersion length and the nonlinear length. By choosing N-PCF and laser pulse with appropriate parameters, a broadband super flat spectrum in a short length can be achieved.

关 键 词：光子晶体光纤 正常色散区 纳米结构 飞秒激光脉冲 非线性特性 群速度色散 色散长度 传播效应 

分 类 号：TN253[电子电信—物理电子学] TB383[一般工业技术—材料科学与工程]