高功率连续光纤激光系统热效应及其抑制措施

林傲祥; 彭昆; 俞娟; 倪力; 戴晓军; 向恒

doi:10.11884/HPLPB202234.210336

高功率连续光纤激光系统热效应及其抑制措施

doi: 10.11884/HPLPB202234.210336

中国工程物理研究院化工材料研究所, 四川绵阳 621900

基金项目: 光纤激光技术所级重大专项

详细信息

作者简介:
林傲祥，linaoxiang@caep.cn

中图分类号: TN248
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-31
- 修回日期: 2021-12-15
- 网络出版日期: 2021-12-13
- 刊出日期: 2022-01-15

Thermal effect and its suppression in high-power continuous-wave fiber laser system

Institute of Chemical Materials, CAEP, Mianyang 621900, China

摘要

摘要: 热效应是影响高功率光纤激光系统安全运行的重要因素之一。探索光纤激光系统热效应产生的源头，积极开展热效应控制技术研究，采取合理措施抑制热集中现象，大幅提高光纤激光系统的模式不稳定阈值以避免模式劣化现象，对于进一步提升光纤激光系统安全稳定输出功率具有非常重要的现实意义。以广泛使用的端面集中泵浦技术为例，概述了高功率连续光纤激光系统的主要热效应来源，提出了针对不同热效应需要采取的解决方案与合理化建议。最后着重介绍了长距离分布式侧面泵浦技术和泵浦增益一体化复合功能激光光纤，展望了万瓦级超高功率光纤激光器的未来发展前景。
- 光纤激光器 /
- 热效应 /
- 模式不稳定 /
- 长距离分布式侧面泵浦 /
- 泵浦增益一体化.
Abstract: Thermal effect is one of the important factors affecting the safe operation of high-power fiber laser system. Exploring the source of thermal effect of optical fiber laser system, actively carrying out research on heat-control technology, taking reasonable measures to suppress heat concentration, and greatly improving the mode instability threshold of optical fiber laser system to avoid mode degradation, are of great practical significance to further improve the safe and stable output power of optical fiber laser system. Taking widely-used concentrated end-pumping technology as an example, this paper summarizes the main sources of thermal effect of high-power continuous-wave fiber laser system, and puts forward practical solutions and reasonable suggestions for different thermal effects. Finally, this paper focuses on long-distance distributed side-pumping technology and pump-gain integrated functional fiber, and looks forward to the future development of 10 kW-level ultra-high power fiber laser.
- fiber laser /
- thermal effect /
- mode instability /
- long-distance distributed side-pumping /
- pump-gain-integrated

HTML全文

图 1 常规谐振腔结构的光纤激光器发热区域

Figure 1. Thermal effects in fiber laser oscillator

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图 2 MOPA结构光纤光纤激光器系统发热位置

Figure 2. Thermal effects in MOPA configuration

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图 3 模式不稳定阈值前(a)，模式不稳定阈值后(b)^[25]

Figure 3. Beam spats before mode instability threshold(a) and after the system reached mode instability threshold(b)^[25]

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图 4 光纤冷却凹槽的不同结构^[44]

Figure 4. Different kinds of fiber colling groove structures^[44]

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图 5 国产LMA-48/400-YDF激光光纤采用1018 nm同带泵浦实现20 kW激光输出^[8]

Figure 5. 20 kW laser output of local LMA-48/400-YDF fiber by 1018 nm-tandem-pumping^[8]

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图 6 氟层辅助三包层光纤的基本结构

Figure 6. F-layer assisted triple-clad laser fiber

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图 7 氟层辅助三包层高功率光纤激光系统^[49]

Figure 7. High-power laser system using F-layer-assisted triple-clad fiber^[49]

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图 8 美国IPG公司10kW侧面泵浦光纤激光方案^[56]

Figure 8. 10kW-level side pumping technique of IPG company, USA^[56]

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图 9 GTwave级联光纤激光振荡器^[72]

Figure 9. Configuration of GTwave cascaded fiber oscillator^[72]

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图 10 (8+1)型泵浦增益一体化复合功能激光光纤：(a)实物端面示意图; (b)泵浦耦合示意图^[5-6]

Figure 10. (8+1) Pump gain Integrated Functional Laser (PIFL) fiber: (a) end cross-section; (b) pump-coupling method^[5-6]

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图 11 万瓦级(8+1)型PIFL光纤的现场测试数据：(a) 信号输出功率及功率示数示意图；(b) 激光光谱^[5-6]

Figure 11. (8+1) PIFL fiber laser: (a) output signal power and optical-to-optical efficiency; (b) laser beam spectrum^[5-6]

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图 12 10 kW级PIFL光纤激光系统结构^[5-6]

Figure 12. 10 kW-level PIFL fiber laser configuration^[5-6]

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图 13 PIFL光纤纵向的(a)包层泵浦吸收和(b)热分布及实测表面温度^[71]

Figure 13. (a) absorption evolution; (b) temperature distribution of core region and polymer clad along PIFL fiber^[71]

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图 14 (8+1)型PIFL谐振腔激光结构^[76]

Figure 14. (8+1) PIFL oscillator structure^[76]

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