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

doi:10.1088/1674-1056/22/8/084206

Abstract 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 carried 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.

Keywords: fiber laser supercontinuum initial chirp fiber amplifier

Received: 18 December 2012
Revised: 26 March 2013
Accepted manuscript online:

PACS:	42.55.Wd	(Fiber lasers)
	42.65.Tg	(Optical solitons; nonlinear guided waves)

Fund: Project 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, and the Fund of Innovation of National University of Defense Technology of China (Grant No. B120701).

Corresponding Authors: Hou Jing, Xiao Rui
E-mail: houjing25@sina.com; ruixiao203@sina.com

Cite this article:

Song Rui (宋锐), Hou Jing (侯静), Wang Ze-Feng (王泽锋), Xiao Rui (肖瑞), Lu Qi-Sheng (陆启生) Effect of initial chirp on near-infrared supercontinuum generation by a nanosecond pulse in a nonlinear fiber amplifier 2013 Chin. Phys. B 22 084206

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

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