Frontiers of Optoelectronics Pub Date : 2023-10-31 , DOI: 10.1007/s12200-023-00087-y Tao Wang 1 , Bo Ren 1 , Can Li 1 , Kun Guo 1 , Jinyong Leng 1, 2, 3 , Pu Zhou 1
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In this work, a high-energy and high peak power chirped pulse amplification system with near diffraction-limited beam quality based on tapered confined-doped fiber (TCF) is experimentally demonstrated. The TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250 µm at the thin end and 56/400 μm at the thick end. With a backward-pumping configuration, a maximum single pulse energy of 177.9 μJ at a repetition rate of 504 kHz is realized, corresponding to an average power of 89.7 W. Through partially compensating for the accumulated nonlinear phase during the amplification process via adjusting the high order dispersion of the stretching chirped fiber Bragg grating, the duration of the amplified pulse is compressed to 401 fs with a pulse energy of 126.3 μJ and a peak power of 207 MW, which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fiber laser. At the highest energy, the polarization extinction ratio and the M2 factor were respectively measured to be ~ 19 dB and 1.20. In addition, the corresponding intensity noise properties as well as the short- and long-term stability were also examined, verifying a stable operation of the system. It is believed that the demonstrated laser source could find important applications in, for example, advanced manufacturing and photomedicine.
Graphical Abstract
中文翻译：
单片锥形掺镱光纤啁啾脉冲放大器可提供 126 μJ 和 207 MW 飞秒激光，光束质量接近衍射极限
在这项工作中，实验演示了一种基于锥形限域掺杂光纤（TCF）的高能量、高峰值功率啁啾脉冲放大系统，具有接近衍射极限的光束质量。 TCF 的纤芯数值孔径为 0.07，纤芯/包层直径在薄端为 35/250 µm，在厚端为 56/400 µm。采用反向泵浦配置，在重复频率为504 kHz时实现最大单脉冲能量为177.9 μJ，对应平均功率为89.7 W。通过调节高电平部分补偿放大过程中累积的非线性相位。拉伸啁啾光纤布拉格光栅的阶色散，放大脉冲的持续时间被压缩到401 fs，脉冲能量为126.3 μJ，峰值功率为207 MW，据我们所知，这是迄今为止报道的最高峰值功率来自单片超快光纤激光器。在最高能量处，测得偏振消光比和M 2因子分别为约19dB和1.20。此外，还检查了相应的强度噪声特性以及短期和长期稳定性，验证了系统的稳定运行。人们相信，所演示的激光源可以在先进制造和光医学等领域找到重要的应用。
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