中国激光, 2017, 44 (2): 0201011, 网络出版: 2017-02-22
高功率、高质量全保偏光纤飞秒激光放大系统 下载: 528次
All Polarization-Maintaining Fiber Amplification System to Generate High-Power and High-Quality Femtosecond Laser Pulses
激光光学 保偏光纤合束器 周期性光谱调制 啁啾脉冲放大 光纤飞秒激光放大系统 laser optics polarization-maintaining fiber combiner periodic spectral modulation chirped-pulse amplification femtosecond fiber laser amplification system
摘要
利用普通大模场面积掺镱保偏双包层光纤作为增益介质,采用啁啾脉冲放大技术搭建了全保偏光纤飞秒激光放大系统。由于全保偏光纤结构,系统具有较高的集成度和长期稳定性。将系统中积累的三阶色散与放大过程中引入的非线性啁啾相互补偿,通过控制展宽光纤的长度,优化了压缩后脉冲质量和宽度。同时分析了周期性光谱调制对放大输出的影响,通过优化保偏(2+1)×1光纤合束器的制作工艺,解决了其引起的周期性光谱调制问题,最终获得重复频率为111 MHz,压缩后输出平均功率为9 W,对应脉宽为260 fs,单脉冲能量为81 nJ,保偏比为13 dB的高质量飞秒激光脉冲输出。
Abstract
An all polarization-maintaining fiber femtosecond laser amplification system, using Yb-doped large-mode-area double-cladding fiber (LMA-DCF) as gain medium and adopting the chirped pulse amplification technology, was constructed. Benefiting from the all polarization-maintaining fiber construction, the amplification system showed high -integration and long-term stability. Furthermore, the quality and duration of the pulses after compression were optimized by controlling the length of the stretcher fiber, which made it possible to compensate the third-order- dispersion accumulated in the system by introducing nonlinear chirp in the amplifier. Meanwhile, we analyzed the impact on amplified pulses caused by periodic spectral modulation. Through optimizing artisan craftsmanship of polarization-maintaining fiber (2+1)×1 combiner, the issue of periodic spectral modulation was solved. Finally, the high-quality ultrashort laser pulses with an average power of 9 W and a pulse duration of 260 fs at the repetition rate of 111 MHz after compression, corresponding to single pulse energy up to 81 nJ and pulse polarization ratio of 13 dB, were generated.
文亮, 刘博文, 宋寰宇, 胡明列, 宋有建, 柴路, 朱哲, 王清月. 高功率、高质量全保偏光纤飞秒激光放大系统[J]. 中国激光, 2017, 44(2): 0201011. Wen Liang, Liu Bowen, Song Huanyu, Hu Minglie, Song Youjian, Chai Lu, Zhu Zhe, Wang Qingyue. All Polarization-Maintaining Fiber Amplification System to Generate High-Power and High-Quality Femtosecond Laser Pulses[J]. Chinese Journal of Lasers, 2017, 44(2): 0201011.