Comparison of femtosecond pulse dynamics in a PCF amplifier with backward and forward pump schemes
详细信息 查看全文
- 作者：Xiaowei Zhao ; Lu Chai ; lu_chai@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Junkai Shi ; Bowen Liu ; Youjian Song ; Yanfeng Li ; Minglie Hu ; Chingyue Wang
- 关键词：PCF femtosecond laser amplifier ; Pump scheme ; Femtosecond pulse dynamics
- 刊名：Optik - International Journal for Light and Electron Optics
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：127
- 期：6
- 页码：3435-3439
- 全文大小：1303 K
文摘
A comparative study of femtosecond pulse dynamics in a photonic crystal fiber amplifier with backward and forward pump schemes is demonstrated experimentally and numerically. The output power, pulse duration and spectrum width of the amplified soliton pulse at different pump powers under the two pump schemes are discussed. The results show that the evolution of the soliton pulse shape in the temporal and spectral domains is also dependent on the direction of pump besides the output power. A narrower pulse duration and spectral width (i.e. smaller time-bandwidth-product), the much less nonlinearity accumulation (i.e. smaller B-Integral value) and a higher output power can be obtained in the backward pump scheme compared to that in the forward pump scheme. The physical origin can be explained by the interaction among group-velocity dispersion, self-phase modulation and nonuniform gain distribution along the fiber due to different end-pump directions. The results provide convincing support to choose the backward pump scheme rather than the forward pump scheme in soliton amplification region in a femtosecond fiber amplifier.