High-power femtosecond laser generation from an all-fiber linearly polarized chirped pulse amplifier

IF 5.2 1区物理与天体物理 Q1 OPTICS

High Power Laser Science and Engineering Pub Date : 2023-02-09 DOI:10.1017/hpl.2023.12

Tao Wang, Can Li, Bo Ren, Kun Guo, Jian Wu, Jin-yong Leng, P. Zhou

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引用次数: 4

Abstract

Abstract An all-fiber high-power linearly polarized chirped pulse amplification (CPA) system is experimentally demonstrated. Through stretching the pulse duration to a full width of approximately 2 ns with two cascaded chirped fiber Bragg gratings (CFBGs), a maximum average output power of 612 W is achieved from a high-gain Yb-doped fiber that has a core diameter of 20 μm with a slope efficiency of approximately 68% at the repetition rate of 80 MHz. At the maximum output power, the polarization degree is 92.5% and the M2 factor of the output beam quality is approximately 1.29; the slight performance degradations are attributed to the thermal effects in the main amplifier. By optimizing the B-integral of the amplifier and finely adjusting the higher-order dispersion of one of the CFBGs, the pulse width is compressed to 863 fs at the highest power with a compression efficiency of 72%, corresponding to a maximum compressed average power of 440.6 W, single pulse energy of 5.5 μJ and peak power of about 4.67 MW. To the best of our knowledge, this is the highest average power of a femtosecond laser directly generated from an all-fiber linearly polarized CPA system.

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全光纤线偏振啁啾脉冲放大器产生高功率飞秒激光

实验证明了一种全光纤高功率线极化啁啾脉冲放大系统。通过将两个级联啁啾光纤Bragg光栅(cfbg)的脉冲持续时间延长至约2 ns的全宽，在80 MHz重复频率下，芯径为20 μm的高增益掺镱光纤的最大平均输出功率为612 W，斜率效率约为68%。在最大输出功率下，偏振度为92.5%，输出光束质量M2因子约为1.29;轻微的性能下降归因于主放大器的热效应。通过优化放大器的b积分和精细调整其中一个CFBGs的高阶色散，在最高功率下将脉冲宽度压缩到863 fs，压缩效率为72%，最大压缩平均功率为440.6 W，单脉冲能量为5.5 μJ，峰值功率约为4.67 MW。据我们所知，这是由全光纤线偏振CPA系统直接产生的飞秒激光的最高平均功率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Power Laser Science and Engineering Physics and Astronomy-Nuclear and High Energy Physics

CiteScore

7.10

自引率

4.20%

发文量

401

审稿时长

21 weeks

期刊介绍： High Power Laser Science and Engineering (HPLaser) is an international, peer-reviewed open access journal which focuses on all aspects of high power laser science and engineering. HPLaser publishes research that seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications and laser components. Topics covered include laser-plasma interaction, ultra-intense ultra-short pulse laser interaction with matter, attosecond physics, laser design, modelling and optimization, laser amplifiers, nonlinear optics, laser engineering, optical materials, optical devices, fiber lasers, diode-pumped solid state lasers and excimer lasers.