Thulium-doped all-PM fiber chirped pulse amplifier delivering 314 W average power

IF 5.2 1区物理与天体物理 Q1 OPTICS

High Power Laser Science and Engineering Pub Date : 2023-08-14 DOI:10.1017/hpl.2023.68

Bo Ren, Can Li, Tao Wang, Kun Guo, Jian Wu, Pu Zhou

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引用次数: 0

Abstract

Abstract A high-power all polarization-maintaining (PM) chirped pulse amplification (CPA) system operating in the 2.0 μm range is experimentally demonstrated. Large mode area (LMA) thulium-doped fiber (TDF) with a core/cladding diameter of 25/400 μm is employed to construct the main amplifier. Through dedicated coiling and cooling of the LMA-TDF to manage the loss of the higher order mode and thermal effect, a maximum average power of 314 W with a slope efficiency of 52% and polarization extinction ratio of 20 dB is realized. The pulse duration is compressed to 283 fs with a grating pair, corresponding to a calculated peak power of 10.8 MW, considering the compression efficiency of 88% and the estimated Strehl ratio of 89%. Moreover, through characterizing the noise properties of the laser, an integrated relative intensity noise of 0.11% at 100 Hz−1 MHz is obtained at the maximum output power, whereas the laser timing jitter is degraded by the final amplifier from 318 to 410 fs at an integration frequency of 5 kHz to 1 MHz, owing to the self-phase modulation effect-induced spectrum broadening. The root-mean-square of long-term power fluctuation is tested to be 0.6%, verifying the good stability of the laser operation. To the best of our knowledge, this is the highest average power of an ultrafast laser realized from an all-PM-fiber TDF-CPA system ever reported.

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掺铥全pm光纤啁啾脉冲放大器，平均功率314w

实验证明了一种工作在2.0 μm范围内的大功率全保偏啁啾脉冲放大系统。主放大器采用芯/包层直径为25/400 μm的大模面积掺铥光纤(TDF)。通过对LMA-TDF进行专门的卷取和冷却，控制高阶模式损耗和热效应，实现了最大平均功率314 W，斜率效率52%，偏振消光比20 dB。利用光栅对将脉冲持续时间压缩到283 fs，考虑到压缩效率为88%，估计Strehl比为89%，计算出的峰值功率为10.8 MW。此外，通过对激光器噪声特性的表征，在最大输出功率下，在100 Hz ~ 1 MHz频率下获得了0.11%的集成相对强度噪声，而在5 kHz ~ 1 MHz的积分频率下，由于自相位调制效应引起的频谱展宽，最终放大器将激光时序抖动从318 fs降低到410 fs。经测试，长期功率波动的均方根为0.6%，验证了激光器工作的良好稳定性。据我们所知，这是迄今为止报道的全pm光纤TDF-CPA系统实现的最高平均功率的超快激光器。

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.