Coherent beam combining of fiber laser array based on diffractive optical element
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摘要: 从衍射光学元件的基本原理出发，围绕连续波和脉冲波两大应用领域，综述了国内外基于衍射光学元件实现共孔径相干合成的研究进展。在国内，上海光学精密机械研究所分别实现了连续光和脉冲光的合成，连续光实现了206 W的输出功率，光束质量1.38，合束效率29.6%；脉冲光实现了峰值功率1.02 kW，重复频率2.2 MHz的ns级脉冲相干合成光束，合束效率61%。在国外，连续光方面实现了5 kW量级的合成光输出，合束效率82%；脉冲光方面实现了平均功率150 mW，重复频率100 MHz的fs级脉冲相干合成光束，合束效率83.4%。最后对基于衍射光学元件的激光相干合成技术的未来发展做出了展望，相信在不久的将来，基于衍射光学元件的相干合成技术会不断发展，逐渐突破技术瓶颈，从而为更多的应用领域奠定坚实基础。Abstract: This article summarizes the research progress of common aperture coherent beam combining based on diffraction optical elements domestically and abroad, starting from the basic principles of diffraction optical elements, and focusing on the two application fields of continuous waves and pulsed waves. Domestically, the Shanghai Institute of Optics and Fine Mechanics has achieved the synthesis of both continuous and pulsed light. Continuous light output of 206 W was achieved with a beam quality of 1.38 and a beam combining efficiency of 29.6%; pulsed light output of a nanosecond-level pulse coherent combining beam with a peak power of 1.02 kW and a repetition frequency of 2.2 MHz was achieved, beam combining efficiency is 61%. Abroad, 4.9 kW coherent beam combining output has been achieved in continuous light, with a beam coupling efficiency of 82%; in the case of pulsed light, a femtosecond-level pulsed coherent beam combining beam with an average power of 150 mW and a repetition frequency of 100 MHz has been achieved, with a beam coupling efficiency of 83.4%. Finally, the future development of laser coherent beam combining technology based on diffraction optical elements is discussed, and it is believed that in the near future, diffraction optical element-based coherent beam combining technology will continue to develop, gradually break through technical bottlenecks, and lay a solid foundation for more application fields.
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Key words:
- laser optics /
- diffractive optical element /
- coherent beam combining /
- fiber laser /
- phase locking
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图 2 二值光栅相干合成技术共腔结构注入锁定结构示意图
Figure 2. Schematic diagram of injection locking structure of binary grating coherent beam combining (CBC) technology co-cavity structure
图 3 三路单模光纤激光的相干合成基本原理与实验装置
Figure 3. Basic principle and experimental setup of coherent beam combining of three-channel single-mode fiber lasers
图 4 基于达曼光栅的半导体激光器相干合成原理
Figure 4. Principle of coherent beam combining of semiconductor lasers based on Damman gratings
图 5 光栅的被动相干光束合成实验装置
Figure 5. Experimental setup and spectrogram of passive coherent beam combining based on quantum cascade lasers (QCLs) and Dammann gratings
图 6 全光反馈环形腔实验装置与实验结果图
Figure 6. All-optical feedback ring cavity experimental setup and experimental results
图 11 2.4 kW DOE相干合成实验结构图
Figure 11. 2.4 kW DOE coherent beam combining experiment structure diagram
图 12 4.9 kW DOE相干合成实验结构
Figure 12. Structure diagram of 4.9 kW DOE coherent beam combining system
图 13 4路超短脉冲衍射相干合成实验装置
Figure 13. Experimental setup of two-dimensional combination of four ultrashort pulsed beams using a diffractive optic pair
图 14 8路超短脉冲衍射相干合成实验装置及原理图
Figure 14. Experimental setup of 8-array ultrashort pulse diffraction coherent beam combining
图 15 DOE2分束形成5×5子光束阵列，子光束在合成前后的光斑图样
Figure 15. Formation of the 5 × 5 uncombined beam array exiting DOE2, with a 3 × 3 incident beam array
图 16 基于模式识别8路衍射相干合成实验装置
Figure 16. Experimental setup of deterministic stabilization of eight-way 2D diffractive beam combining using pattern recognition
图 17 81路衍射相干合成验证系统和SLM产生9×9光束的全息图
Figure 17. SLM combiner experiment and hologram on SLM for generating 9×9 beams
图 18 输出为81路光束的神经网络结构图、光束相位模式及衍射强度模式
Figure 18. Structure of the neural network, with interference patterns (17×17) as input and the corresponding 81-beam phases array (9×9) as the output
图 19 3路平铺孔径阵列相干合成远场图样（23 W平均输出功率）
Figure 19. Far-field interference pattern of three tiled aperture pulsed beamlets by an all-optical feedback loop
图 20 相干合成光束5个脉冲的序列图
Figure 20. Measured pulse shape of the combined beam in five cycles
表 1 DOE连续光相干合成代表性研究成果
Table 1. Representative research results of DOE CW CBC
year institution result reference 2008 Northrop Grumman 5 fiber lasers with 109 mW overall power, M2=1.04, combination efficiency is 91.4% [53] 2012 Massachusetts Institute of Technology 5 fiber lasers with 1.93 kW overall power, M2=1.1,
combination efficiency is 79%[54] 2012 Northrop Grumman 15 fiber lasers with 600 W overall power, M2=1.1,
combination efficiency is 68%[55] 2014 Northrop Grumman 3 fiber lasers with 2.4 kW overall power, M2=1.2,
combination efficiency is 80%[56] 2016 Air Force Research Laboratory 5 fiber lasers with 4.9 kW overall power, M2=1.1,
combination efficiency is 82%[57-58] 
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表 2 DOE脉冲光相干合成代表性研究成果
Table 2. Representative research results of DOE pulse CBC
Year institution result reference 2014 Shanghai Insititute of Optics and Fine Mechanics,
Chinese Academy of Scienceschannel number is 2; tp=9.6 ns; fp=2.2 MHz; Pp=1.02 kW; η=61% [64] 2017 Lawrence Berkeley National Laboratory channel number is 4; tp=120 fs; fp=100 MHz; Pa=150 mW; η=83.4% [59] 2018 Lawrence Berkeley National Laboratory channel number is 8; tp=120 fs; fp=100 MHz; η=85.4% [60] 2019 Lawrence Berkeley National Laboratory channel number is 8; tp=100 fs; η=84.6% [61] 2021 Air Force Research Laboratory channel number is 81; η=60.4% [62]
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