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

• Published in: Chinese physics B Vol. 22; no. 8; pp. 445 - 450
• Main Author: 宋锐 侯静 王泽锋 肖瑞 陆启生
• Format: Journal Article
• Language: English
• Published: 01.08.2013
• Subjects: Amplifiers; Chirp; Fibers; Mathematical analysis; Nanosecond pulses; Nanostructure; Nonlinearity; Pumps; Simulation; 主振荡功率放大器; 光纤放大器; 初始啁啾; 复Ginzburg-Landau方程; 纳秒脉冲; 超连续谱; 近红外; 非线性
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/8/084206

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.