Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Bo Ren, Hongxiang Chang, Can Li, Tao Wang, Kaikai Jin, Jiayi Zhang, Kun Guo, Rongtao Su, Jinyong Leng, Pu Zhou
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Abstract

In this paper, we report a coherent beam combining (CBC) system that involves two thulium-doped all-polarization maintaining (PM) fiber chirped pulse amplifiers. Through phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent (SPGD) algorithm, a maximum average power of 265 W is obtained, with a CBC efficiency of 81% and a residual phase error of λ/17. After de-chirping by a pair of diffraction gratings, the duration of the combined laser pulse is compressed to 690 fs. Taking into account the compression efficiency of 90% and the main peak energy proportion of 91%, the corresponding peak power is calculated to be 4 MW. The laser noise characteristics before and after CBC are examined, and the results indicate that the CBC would degrade the low frequency relative intensity noise (RIN), of which the integration is 1.74% in [100 Hz, 2 MHz] at the maximum combined output power. In addition, the effects of the nonlinear spectrum broadening during chirped pulse amplification on the CBC efficiency are also investigated, showing that a higher extent of pulse stretching is effective in alleviating the spectrum broadening and realizing a higher output power with decent combining efficiency.

两个全 PM 掺铥光纤啁啾脉冲放大器的相干光束组合。
本文报告了一种相干光束结合(CBC)系统,该系统包括两个掺铥全偏振维持(PM)光纤啁啾脉冲放大器。通过随机并行梯度下降(SPGD)算法,通过光纤拉伸器锁定两个通道的相位,可获得 265 W 的最大平均功率,CBC 效率为 81%,残余相位误差为 λ/17。通过一对衍射光栅去啁啾后,组合激光脉冲的持续时间被压缩到 690 fs。考虑到 90% 的压缩效率和 91% 的主峰能量比例,计算得出相应的峰值功率为 4 兆瓦。对 CBC 前后的激光噪声特性进行了研究,结果表明,CBC 会降低低频相对强度噪声(RIN),在最大组合输出功率下,[100 Hz, 2 MHz] 的积分为 1.74%。此外,还研究了啁啾脉冲放大过程中的非线性频谱展宽对 CBC 效率的影响,结果表明较高程度的脉冲拉伸可有效缓解频谱展宽,并实现较高的输出功率和较好的组合效率。
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
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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