基于全光纤啁啾脉冲放大的千瓦级飞秒激光相干合成

王涛; 张嘉怡; 任博; 唐振强; 常洪祥; 李体鉴; 贺志文; 周毅; 李灿; 冷进勇; 罗智超; 周朴

doi:10.11884/HPLPB202638.250430

基于全光纤啁啾脉冲放大的千瓦级飞秒激光相干合成

doi: 10.11884/HPLPB202638.250430

王涛^1,,
张嘉怡¹,
任博¹,
唐振强¹,
常洪祥¹,
李体鉴²,
贺志文¹,
周毅¹,
李灿^1, ,,
冷进勇¹,
罗智超²,
周朴^1, ,

1.
国防科技大学前沿交叉学科学院，长沙 410073
2.
华南师范大学光电科学与工程学院，广州 510006

基金项目: 国家重点研发计划项目（2024YFB3613500）；国家自然科学基金项目(62405374、62475286、62505368)

详细信息

作者简介:
王　涛，wangtaobit@163.com

通讯作者:
李　灿，lc0616@163.com。

周　朴，zhoupu203@163.com。

中图分类号: TN248
计量
- 文章访问数: 9
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- 被引次数: 0
出版历程
- 收稿日期: 2025-11-30
- 修回日期: 2025-01-01
- 录用日期: 2025-12-25
- 网络出版日期: 2026-01-21

Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification

1.
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2.
School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China

摘要

摘要: 高功率飞秒光纤激光在先进制造、激光粒子加速和高次谐波产生等领域具有广泛的应用，飞秒光纤激光相干合成技术是突破单根光纤功率极限、实现高功率飞秒激光输出的有效技术手段。搭建了一套基于全光纤结构啁啾脉冲放大的飞秒激光相干偏振合成系统，采用光纤拉伸器并结合随机并行梯度下降算法实现了三路激光放大器的相位调节与稳定相干合成。在总输出功率为1219.1 W时，系统合成功率为1072 W，对应的合成效率为87%。合成光束具有近衍射极限光束质量（M²=1.23），压缩后脉冲宽度为899 fs。此外，还理论分析了光束质量退化对合成效率的影响。该全光纤结构飞秒激光相干合成系统具有优异的稳定性并兼具高功率输出，未来通过增加合成通道数量可以进一步提升输出功率，为高通量超快超强激光的前沿应用提供技术支撑。
- 超快光纤激光 /
- 相干光束合成 /
- 高功率飞秒激光 /
- 啁啾脉冲放大 /
- 主动相位控制
Abstract: Background
High-power femtosecond fiber lasers have extensive applications in advanced manufacturing, laser particle acceleration, high-order harmonic generation and so on. Coherent beam combining (CBC) of femtosecond fiber lasers serves as an effective technical approach to overcome the power limitations of single fibers and achieve high-power femtosecond laser output.
Purpose
This work aims to develop a high-power femtosecond fiber laser CBC system to achieve kilowatt-level average power output with high stability.
Methods
The presented femtosecond fiber laser CBC system is based on a three-channel all-fiber chirped pulse amplifier. Phase adjustment and stable coherent combining of three laser amplifiers are achieved using fiber stretchers in combination with the stochastic parallel gradient descent (SPGD) algorithm.
Results
At a total output power of 1219.1 W, the system delivers a combined power of 1072 W, corresponding to a combining efficiency of 87%. The combined beam exhibits near-diffraction-limited beam quality (M²=1.23), and the compressed pulse width is 899 fs. Furthermore, the influence of beam quality degradation on the combining efficiency is theoretically analyzed. The results show that the combining efficiency would decrease as the beam quality degradation rate increased, and the combining efficiency is more sensitive to the degradation of multi-channel beam quality.
Conclusions
The demonstrated all-fiber coherent beam combining system exhibits excellent stability and high-power output. Further power scaling can be realized by increasing the number of combining channels, thereby providing crucial technical support for the advanced applications of high flux ultrafast and ultra-intense lasers.
- ultrafast fiber laser /
- coherent beam combination /
- high power femtosecond laser /
- chirped pulse amplification /
- active phase control

HTML全文

图 1 基于全光纤飞秒激光啁啾脉冲放大的相干合成系统实验装置图，其中CFBG为啁啾光纤布拉格光栅，pre-amp为预放大器，ODL为光学延迟线，main-amp为主放大器，CO为准直器，HWP为半波片，M为高反镜，PBS为偏振分束棱镜，BS为分束镜，TFP为薄膜偏振片，PD为光电探测器

Figure 1. Schematic setup of the coherent beam combining system based on all-fiber femtosecond laser chirped pulse amplification. CFBG: chirped fiber Bragg grating; pre-amp: pre-amplifier; ODL: optical delay line; main-amp: main amplifier; CO: collimator; HWP: half-wave plate; M: mirror; PBS: polarization beam splitter; BS: beam splitter; TFP: thin-film polarizer; PD: photodetector

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图 2 种子源的输出脉冲特性

Figure 2. Output pulse characteristics of the seed laser

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图 3 相干合成系统的输出功率与合成效率

Figure 3. The output power and combining efficiency of the CBC system

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图 4 相干合成系统的功率谱密度曲线和输出光谱

Figure 4. Power spectral density curves of the CBC system and output spectrum

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图 5 最高功率下单路及合成后的光斑

Figure 5. Beam profiles of the individual channels and after combination at the highest power

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图 6 合成光束的光束质量

Figure 6. The beam quality of the combined beam

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图 7 光束质量劣化率对合成效率的影响

Figure 7. Combining efficiency as a function of beam quality degradation rate

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图 8 最高功率下单路及合成光束的压缩脉宽

Figure 8. Compressed pulse width of the individual channels and combined beam at the highest power

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