低NA光纤实现5 kW高亮度线偏振激光输出

舒畅; 陈冬旭; 邢颍滨; 彭景刚; 李海清; 戴能利; 李进延

doi:10.11884/HPLPB202638.250251

低NA光纤实现5 kW高亮度线偏振激光输出

doi: 10.11884/HPLPB202638.250251

华中科技大学武汉光电国家研究中心，武汉 430074

基金项目: 国家重点研发计划项目(2023YFB4604500)

详细信息

作者简介:
舒　畅，1074412146@qq.com

通讯作者:
邢颍滨，xingyb@hust.edu.cn。

中图分类号: O436
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-05
- 修回日期: 2025-10-31
- 录用日期: 2025-10-31
- 网络出版日期: 2025-12-15

A high-brightness, linearly polarized laser output of 5 kW achieved by low-NA fiber

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China

摘要

摘要: 为有效抑制高功率光纤激光系统中的受激布里渊散射效应，本研究采用白噪声射频信号对单频激光进行相位调制，将其光谱展宽为半高全宽89 GHz的高斯线型，从而实现对受激布里渊散射效应的有效抑制。通过采用自主制备的低数值孔径（约0.05）、大模场面积（约237 μm²）熊猫型掺镱保偏光纤，其双折射系数4.23×10⁻⁴，在抑制受激布里渊散射效应的同时也有效缓解了模式间热耦合问题，最终实现了5.09 kW窄线宽线偏振激光输出。输出光谱线宽为89 GHz，偏振消光比在整个放大过程中始终优于19.6 dB，光束质量因子M²＜1.2。在最高输出功率下未观察到自脉冲或时域不稳定现象，表明受激布里渊散射效应与模式不稳定（TMI）已得到有效控制，证明该系统具备长期稳定运行的潜力。
- 高功率光纤激光器 /
- 掺镱保偏光纤 /
- 相位调制 /
- 高亮度光纤激光器
Abstract: Background
Fiber lasers have gained extensive adoption across medical, telecommunications, industrial processing, and defense sectors owing to their exceptional beam quality, operational stability, compact architecture, and high reliability. Among them, narrow-linewidth linearly polarized fiber lasers have become a key research focus due to their outstanding spectral purity and coherence, with current efforts concentrated on further scaling their output power and brightness.
Purpose
In this work, we demonstrate a 5.09 kW narrow-linewidth linearly polarized fiber laser system designed to overcome stimulated Brillouin scattering (SBS) and transverse mode instability (TMI).
Methods
A white-noise radio frequency phase modulation scheme is implemented to broaden the seed laser spectrum into a Gaussian profile with 89 GHz full width at half maximum, enabling effective SBS suppression. A polarization-maintaining ytterbium-doped fiber (PMYDF) with low numerical aperture (～0.05), large mode area (～237 μm²), and high birefringence coefficient (4.23×10⁻⁴) is employed to simultaneously mitigate SBS and intermodal thermal coupling.
Results
The system achieves 5.09 kW output power while maintaining an 89 GHz spectral linewidth, polarization extinction ratio above 19.6 dB, and beam quality factor of M² < 1.2. No self-pulsing or temporal instability is observed at maximum power, confirming suppression of both SBS and TMI.
Conclusions
By employing a white-noise radio frequency signal to modulate the phase of a single-frequency laser, the SBS effect in high-power fiber laser systems is effectively suppressed. Concurrently, intermodal thermal coupling and SBS are further mitigated using a fabricated low-numerical-aperture, large-mode-area PMYDF. The demonstrated performance supports the feasibility of high-power, narrow-linewidth polarized fiber lasers for long-term stable operation.
- High-power fiber laser /
- Ytterbium-doped polarization-maintaining fiber /
- Phase modulation /
- High-brightness fiber laser

HTML全文

图 1 光纤截面图

Figure 1. Cross-section of fiber

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图 2 实验装置结构图

Figure 2. Experimental setup

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图 3 激光输出特性。

Figure 3. Laser output characteristic at 5090W

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图 4 激光光谱特性

Figure 4. Laser spectrum output characteristics at 5090W

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表 1 激光性能与技术对比

Table 1. Laser Performance vs. Technology

institution	year	technology	llaser power/kW	FWHM/GHz	PER/dB	M²
CAEP^[7]	2022	optimization of the seed spectral profile	4.45	21	17.7	1.26
CAEP^[8]	2023	optimization of the seed spectral profile	5	10	16.5	1.26
NUDT^[9]	2023	transverse mode control	4.5	87	10.3	1.51
HUST^[10]	2023	optimizing longitudinal modes in the oscillator	4.6	89	15	1.3
NUDT^[11]	2025	fabrication of low NA fiber, NA～0.06	5.91	159	12.9	1.33
CAEP^[12]	2025	cascaded phase modulation	5.87	111	16.3	1.33
This work	2025	fiber fabrication, NA～0.05, MFA～237 μm²	5.09	89	19.6	1.19

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参考文献(16)

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