1.3 mJ, 396 MHz hybrid chirped pulse amplification system laser with fiber-Yb:YAG crystal rod

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-06-24 DOI:10.1016/j.rinp.2025.108344

Zhili Li , Ting Luo , Xinjian Pan , Liming Liu , Shixiang Xu

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Abstract

A high-repetition-rate, hybrid chirped pulse amplification system (CPA) is presented, utilizing fiber pre-amplifier in conjunction with a Yb:YAG crystal thin rod as the main amplifier. The repetition frequency of the laser pulses is reduced from 396 MHz to several tens of kilohertz, which is necessary for burst pulse applications in industrial processing. Following the hybrid chirped amplification, the laser pulses are compressed using a grating pair compressor that provides a dispersion match with the stretcher composed of chirped fiber Bragg gratings (CFBGs). The system achieves an average output power of 32.5 W, a burst energy of 1.3mJ, and a pulse duration of 720 fs. Notably, the spectral gain narrowing effect was observed, with the narrowest spectral width recorded at 2.7 nm. The findings indicate that the nonlinear and thermal effects, which frequently arise in laser amplifiers, are effectively managed within this system. This configuration shows significant potential for improving efficiency in industrial processing as it is capable of delivering high-energy, high-power pulsed laser output. Thereby establishing it as a preferred option for ensuring optimal reliability and stability in ultrafast lasers for industrial applications.

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1.3 mJ、396 MHz光纤- yb:YAG晶体棒混合啁啾脉冲放大系统激光器

提出了一种利用光纤前置放大器和Yb:YAG晶体细棒作为主放大器的高重复率混合啁啾脉冲放大系统。激光脉冲的重复频率从396兆赫降低到几十千赫兹，这是工业加工中突发脉冲应用所必需的。在混合啁啾放大之后，使用光栅对压缩器对激光脉冲进行压缩，该压缩器与啁啾光纤布拉格光栅（cfbg）构成的拉伸器提供色散匹配。该系统的平均输出功率为32.5 W，突发能量为1.3mJ，脉冲持续时间为720 fs。值得注意的是，观察到光谱增益变窄效应，最窄的光谱宽度为2.7 nm。研究结果表明，该系统有效地控制了激光放大器中经常出现的非线性效应和热效应。这种配置显示出在工业加工中提高效率的巨大潜力，因为它能够提供高能量、高功率的脉冲激光输出。从而建立它作为一个首选的选择，以确保最佳的可靠性和稳定性的超快激光器的工业应用。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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