9.6 kW combined light source using dichroic-mirror-based spectral beam combining
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摘要: 通过光纤激光光谱合成技术，可以打破单个光纤激光器输出功率受非线性因素制约的限制，实现更高功率的激光输出。通过梳理光谱合成技术的发展历程并分析其现状，对其原理及优劣势进行分析，结合自身研究，设计了一款便携式3路合成系统，通过设计及优化光纤激光器的放大结构，严格把控参与合束的子束光源的质量，将1055、1070和1085 nm三路高功率窄线宽光纤激光进行合束，对合成系统中采用的双色镜进行研究，对其膜系指标进行严格的设计，对高陡度截止滤光膜的设计方法以及制备工艺进行分析，对其热损伤规律及控制技术进行研究，优化整个合成系统，最终实现合成功率9650 W的高功率激光输出，合成效率92%，光束质量M2为1.7，并对未来双色镜光谱合成进行了展望。Abstract: Using the fiber laser spectral beam combining technology, the limitation of the output power of a single fiber laser due to nonlinear factors can be broken, and a higher power laser output can be realized. Combing the development history of spectral beam combing technology and analyzing its current situation, principle, advantages and disadvantages, and combining with our research, we have designed a portable 3-channel combining system. By optimizing the entire combining system, three high power narrow linewidth fiber lasers of 1055 nm, 1070 nm and 1085 nm were combined to achieve a high-power laser output of 9650 W, with combincotion efficiency of 92%, and beam quality M2 of 1.7. The future dichromatic mirror spectral beam combining is also prospected.
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Key words:
- fiber laser /
- high power /
- narrow linewidth /
- dichroic mirror /
- spectral beam combining
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图 2 3.5 kW窄线宽光纤激光器原理示意图
Figure 2. Schematic diagram of the 3.5 kW narrow linewidth fiber laser
图 4 激光损伤阈值测试示意图
Figure 4. Schematic diagram of the optical damage threshold test of coatings
图 5 温度变化情况以及显微镜下的观测结果
Figure 5. Temperature variation on surface of the coatings and observations results
图 8 合成激光功率以及效率变化曲线
Figure 8. Variation of combined output power and combination efficiency
表 1 双色镜合成相关参数对比
Table 1. Comparison of parameters related to bicolor mirror combination
year authors power/kW beam quality combined efficiency/% 2015 Zhou Taidou et al 2.50 Mx2=4.21
My2=2.83/ 2016 Zhou Taidou et al 0.72 M2=1.54 94 2019 K. Ludewight et al 5.90 M2=1.90 / 2019 Ma Jun et al 10.25 Mx2≈12.00，My2＞14.00 98 
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