Effect of initial chirp on near-infrared supercontinuum generation by a nanosecond pulse in a nonlinear fiber amplifier

作     者：宋锐 侯静 王泽锋 肖瑞 陆启生 

作者机构：College of Optoelectronic Science and Engineering National University of Defense Technology Beijing Institute of Radiation Medicine 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第8期

页      面：445-450页

核心收录：

学科分类：080902[工学-电路与系统] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：supported by the State Key Program of the National Natural Science Foundation of China(Grant No.61235008) the National Natural Science Foundation of China(Grant Nos.61077076,11004247,and 11274385) the International Science&Technology Cooperation of China(Grant No.2012DFG11470) the Natural Science Foundation for Distinguished Young Scholars of Hunan Province of China(Grant No.12JJ1010) the Outstanding Youth Fund Project of Hunan Province of China the Fund of Innovation of National University of Defense Technology of China(Grant No.B120701) 

主　　题：fiber laser supercontinuum initial chirp fiber amplifier 

摘      要：Theoretical and experimental research on the effect of initial chirp on near-infrared supercontinuum generation by a nanosecond pulse in a nonlinear fiber amplifier is carded out. The complex Ginzburg-Landau equation is used to simulate the propagation of the pulse in the fiber amplifier and the results show that pulses with negative initial chirp produce the widest supercontinuum and pulses with positive initial chirp produce the narrowest supercontinuum when the central wavelength of the pump lies in the normal dispersion region of the gain fiber. A self-made line width narrowing system is utilized to control the initial chirp of the nanosecond pump pulse and a four-stage master oscillator power amplifier configuration is adopted to produce a high power near-infrared suppercontinuum. The experimental results are in good agreement with simulations which can provide some guidance on further optimization of the system in future work.