5-kW narrow-linewidth single-mode fiber laser based on homemade ultra-low absorption LMA-30/400 Yb-doped fiber

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-07-18 DOI:10.1016/j.optlastec.2025.113583

Kun Peng , Shaohua Feng , Yuanan Li , Li Ni , Juan Yu , Heng Xiang , Xiaoxiao Leng , Aoxiang Lin

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引用次数: 0

Abstract

Improving the nonlinear effect thresholds and performance of fiber laser systems becomes essential for developing high-power narrow-linewidth fiber lasers. We have designed and fabricated the novel LMA-30/400 Yb-doped fiber with an ultra-low cladding absorption of 0.22 dB/m@915 nm and a core NA of 0.065. Investigating the influence of bending diameter on cladding absorption indicates that enlarging the bending diameter can effectively reduce cladding absorption. A narrow-linewidth laser with a maximum output power of 5020 W has been achieved based on white-noise phase modulation under non-stabilized 976 nm LD pumping, where the spectral linewidth Δλ_3dB of 0.135 nm, the slope efficiency of 81.4 % and the beam quality of M² of ∼1.21. Importantly, no Transverse Mode Instability (TMI) was observed even at the 5-kW level. This work provides valuable insights for the future development of ultra narrow-linewidth lasers with high power and high beam quality.

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基于国产超低吸收LMA-30/400掺镱光纤的5 kw窄线宽单模光纤激光器

提高光纤激光系统的非线性效应阈值和性能是发展高功率窄线宽光纤激光器的必要条件。我们设计并制作了新型的LMA-30/400掺镱光纤，其超低包层吸收为0.22 dB/m@915 nm，纤芯NA为0.065。研究了弯曲直径对包层吸收的影响，表明增大弯曲直径可以有效降低包层吸收。在非稳定的976 nm LD泵浦条件下，利用白噪声相位调制实现了最大输出功率为5020 W的窄线宽激光器，其中谱线宽Δλ3dB为0.135 nm，斜率效率为81.4%，光束质量M2为~ 1.21。重要的是，即使在5kw的电平下，也没有观察到横向模不稳定性（TMI）。这项工作为未来发展高功率、高光束质量的超窄线宽激光器提供了有价值的见解。

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

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems