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高功率光纤激光具有光束质量好、转换效率高、热管理方便和柔性传输等优势, 在工业加工和国防领域具有广泛的应用需求. 目前, 受限于光纤中的非线性效应和模式不稳定效应, 单链路光纤激光器输出功率的提升遇到了巨大挑战. 为突破单链路激光功率限制, 本文基于双色镜合成技术, 利用两路自研近单模宽谱光纤激光放大器实现了10 kW近单模合束激光输出, 合成效率约为98.3%, 光束质量因子M 2约为1.29. 为进一步提升功率, 采用三路宽谱激光实现了13.52 kW合束激光输出, 合成效率约为96.8%, 光束质量因子M 2约为1.61. 本文首次在实验上验证了双色镜合成技术的对宽谱激光的功率提升潜力和光束质量保持能力, 通过增加合成路数以及提高单路激光功率, 有望在保持高光束质量的情况下实现更高功率激光输出.Owing to the advantages of good beam quality, high conversion efficiency, convenient thermal management and compact structure, high power fiber lasers have been widely desired in industrial processing. So far, the output power has been strictly limited by the nonlinear effects and transverse mode instability. In order to break through the power limitation, here we experimentally demonstrate a power boosting technology called spectral beam combination based on dichromatic mirrors. Firstly, high power fiber amplifiers with different central wavelengths are established for the spectral combination. Secondly, utilizing a dual-beam combined system and two homemade high power fiber amplifiers, an output power of 10 kW is achieved, with a remarkable combination efficiency of 98.3% and a beam quality of M 2～1.33. Secondly, using a three-beam combined system, an output power of 13.5 kW is obtained with a combination efficiency of 96.8% and beam quality of M 2～1.61. By increasing the number of input beams and their output power as well, we believe that a higher output power can be achieved based on dichromatic mirror spectral beam combination.
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Keywords:
- high power /
- fiber laser /
- dichromatic mirror /
- spectral beam combination
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图 2 两路合束实验中激光器在最高输出功率时的光谱
Fig. 2. Optical spectra of the fiber amplifiers at the maximum output power for the dual-beam combination experiment.
图 8 (a)三路激光合束装置示意图; (b)三路激光光谱以及双色镜的透射曲线
Fig. 8. (a) Schematic of the three-beam combining setup; (b) beam spectra and transmission curve of the dichromatic mirrors.
图 4 三路合束实验中单路激光器最高功率时的光谱
Fig. 4. Optical spectra of the fiber amplifiers for the three-beam combination experiment.
图 5 (a)两路激光合束装置示意图和(b)双色镜透射曲线(CL, 凹透镜; PM, 功率计)
Fig. 5. (a) Schematic diagram of the dual-beam combining setup; (b) transmission curve of the dichromatic mirror (CL, concave lens; PM, power meter).
图 6 两路合成实验结果 (a)功率与效率; (b)合成输出光谱和光斑
Fig. 6. Results of the dual-beam combining experiment: (a) Optical power and combining efficiency; (b) output spectrum and beam profile.
图 7 两路合束系统中单路(a), (b)和合束后(c)激光的光束质量测量结果
Fig. 7. Measured beam quality of the (a), (b) fiber amplifiers and the (c) dual-beam combined laser.
图 9 单路激光光束质量测量结果 (a) 1050 nm; (b) 1069 nm; (c) 1085 nm
Fig. 9. Measured beam quality of the pre-combining lasers: (a) 1050 nm; (b) 1069 nm; (c) 1085 nm.
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[1] Nilsson J, Payne D 2011 Science 332 921
Google Scholar
[2] Shi W, Fang Q, Zhu X, Norwood R A, Peyghambarian N 2014 Appl. Opt. 53 6554
Google Scholar
[3] Zervas M N 2014 Inter. J. Mod. Phys. B 28 1442009
Google Scholar
[4] Richardson D, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B 27 63
Google Scholar
[5] Eidam T, Wirth C, Jauregui C, Stutzki F, Jansen F, Otto H J, Schmidt O, Schreiber T, Limpert J, Tünnermann A 2011 Opt. Express 19 1321
Google Scholar
[6] Smith A V, Smith J J 2011 Opt. Express 19 10180
Google Scholar
[7] 肖虎, 潘志勇, 陈子伦, 奚小明, 黄良金, 王蒙, 杨欢, 闫志平, 冷进勇, 王小林, 王泽锋, 周朴, 许晓军, 陈金宝 2022 中国激光 49 1616002
Xiao H, Pan Z Y, Chen Z L, Xi X M, Huang L J, Wang M, Yang H, Yan Z P, Leng J Y, Wang X L, Wang Z F, Zhou P, Xu X J, Chen J B 2022 Chin. J. Lasers 49 1616002
[8] 林傲祥, 肖起榕, 倪力, 李丹, 彭昆, 齐天澄, 俞娟, 田佳丁, 冷晓晓, 吴与伦, 王小龙, 王乐乐, 戴晓军, 向恒, 闫平, 巩马理 2021 中国激光 48 0916003
Lin A X, Xiao Q R, Ni L, Li D, Peng K, Qi T C, Yu J, Tian J D, Leng X X, Wu Y L, Wang X L, Wang L L, Dai X J, Xiang H, Yan P, Gong M L 2021 Chin. J. Lasers 48 0916003
[9] 李峰云, 黎玥, 宋华青, 衣永青, 楚秋慧, 张昊宇, 黄珊, 郭超, 舒强, 颜冬林, 陶汝茂, 黄智蒙, 庞璐, 沈一泽, 史仪, 高聪, 刘念, 贺红磊, 李雨薇, 刘玙, 吴文杰, 王旗华, 温静, 汪卓, 林宏奂, 王建军, 景峰 2021 中国激光 48 2116002
Li F Y, Li Y, Song H Q, Yi Y Q, Chu Q H, Zhang H Y, Huang S, Guo C, Shu Q, Yan D L, Tao R M, Huang Z M, Pang L, Shen Y Z, Shi Y, Gao C, Liu N, He H L, Li Y W, Liu Y, Wu W J, Wang Q H, Wen J, Wang Z, Lin H H, Wang J J, Jing F 2021 Chin. J. Lasers 48 2116002
[10] Wang Y, Chen G, Li J 2018 High Power Laser Sci. Eng. 6 40
Google Scholar
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Zheng Y, Yang Y F, Zhao X, Gong W C, Bai G, Zhang J P, Liu K, Chen X L, Zhao C, Qi Y F, Jin Y X, He B, Zhou J 2017 Chin. J. Lasers 44 0201002
Google Scholar
[12] 何旭宝, 奚小明, 张汉伟, 王小林, 许晓军 2021 激光与光电子学进展 58 0900004
Google Scholar
He X B, Xi X M, Zhang H W, Wang X L, Xu X J 2021 Laser Optoelectron. Prog. 58 0900004
Google Scholar
[13] 穆让修, 张佳, 龙井宇, 李刚, 卜英华, 韩耀锋, 寿少峻 2022 应用光学 43 792
Google Scholar
Mu R X, Zhang J, Long J Y, Li G, Bu Y H, Han Y F, Shou S J 2022 J. Appl. Opt. 43 792
Google Scholar
[14] 许晓军, 韩凯, 刘泽金, 王小林, 马阎星, 张烜喆, 宁禹, 周朴 2019 CN 105762632B
Xu X J, Han K, Liu Z J, Wang X L, Ma Y X, Zhang X Z, Ning Y, Zhou P 2019 CN Patent 105762632B
[15] Regelskis K, Hou K, Raciukaitis G, Galvanauskas A 2008 Conference on Lasers and Electro-Optic San Jose, USA, May 4–9, 2008 p1
[16] Schmidt O, Wirth C, Nodop D, Limpert J, Schreiber T, Peschel T, Eberhardt R, Tünnermann A 2009 Opt. Express 17 22974
Google Scholar
[17] Chen F, Ma J, Wei C, Zhu R, Zhou W, Yuan Q, Pan S, Zhang J, Yize W, Dou J 2017 Opt. Express 25 32783
Google Scholar
[18] He X B, Xiao H, Ma P F, Zhang H W, Wang X L, Xu X J 2021 Infrared Laser Eng. 50 20200385 [何旭宝, 肖虎, 马鹏飞, 张汉伟, 王小林, 许晓军 2021 红外与激光工程 50 20200385
Google Scholar
He X B, Xiao H, Ma P F, Zhang H W, Wang X L, Xu X J 2021 Infrared Laser Eng.50 20200385 Google Scholar
[19] Yang B L, Wang P, Zhang H W, Xi X M, Wang X L, Shi C, Xu X J, Chen J B 2022 Chin. J. Lasers 49 0816001 [杨保来, 王鹏, 张汉伟, 奚小明, 王小林, 史尘, 许晓军, 陈金宝 2022 中国激光 49 0816001
Yang B L, Wang P, Zhang H W, Xi X M, Wang X L, Shi C, Xu X J, Chen J B 2022 Chin. J. Lasers49 0816001 [20] Yang B L, Wang P, Zhang H W, Xi X M, Shi C, Wang X L, Xu X J 2021 Opt. Express 29 26366
Google Scholar
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