基于多模光纤的高斯光束平顶化整形技术
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摘要
高功率平顶光束在激光加工领域具有广泛的应用。针对光束平顶化的问题,提出利用大芯径多模光纤对高斯光束整形的方法。采用RP Fiber Power建立高斯光束传输模型,仿真分析光纤内光束的传输及强度分布特性。研究结果表明,多模光纤对高斯光束具有整形作用。高斯光束经多模光纤传输后,传导模数量增加,能量由中心向径向移动,光束质量下降,能量分布趋于均匀化。光纤的芯径越大,传输长度越长,匀化效果越明显。采用D型纤芯结构,或凹面折射率分布光纤,均可快速匀化光束。
High Power and flat-topped laser radiation has many widely uses in laser industrial application. Gaussian beam can be converted to flat-topped beam by utilizing larger core multimode fiber. Laser beam transmission model was created up with RP Fiber Power soft. The results show that the multimode fibers have the function of beam shaping. After transmitting of single mode Gaussian beam laser, the number of guide modes increases, and the energy transfers from central to edge. The beam quality decreases and the intensity distribution becomes more homogeneous. The larger radius and length of fiber lead to better homogeneous effect. Both D-shaped multimode fiber and fiber with central-dip profile index can be used to improved the uniformity of transmitting beam.
High Power and flat-topped laser radiation has many widely uses in laser industrial application. Gaussian beam can be converted to flat-topped beam by utilizing larger core multimode fiber. Laser beam transmission model was created up with RP Fiber Power soft. The results show that the multimode fibers have the function of beam shaping. After transmitting of single mode Gaussian beam laser, the number of guide modes increases, and the energy transfers from central to edge. The beam quality decreases and the intensity distribution becomes more homogeneous. The larger radius and length of fiber lead to better homogeneous effect. Both D-shaped multimode fiber and fiber with central-dip profile index can be used to improved the uniformity of transmitting beam.
引文
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[17] 金亮, 邹永刚, 丁晔, 等. 双包层光纤折射率研究及纤芯结构优化设计[J]. 强激光与粒子束,2013,25(10):2496—2500.Jin Liang, Zou Yonggang, Ding Ye, et al. Research and optimization on refractive index and core of double cladding fiber[J]. High Power Laser and Particle Beams,2013,25(10):2496—2500.
[2] 刘江, 谭方舟, 刘晨, 等. 高功率超短脉冲掺铥光纤激光器的研究进展[J]. 中国激光,2017,44(2):45—57.Liu Jiang, Tan Fangzhou, Liu Chen, et al. Progress on high-power ultrashort-pulsed thulium-doped fiber lasers [J]. Chinese Journal of Laser,2017,44(2):45—57.
[3] 李川, 韩一平, 赵文娟. 31kW窄线宽线偏振纳秒全光纤激光器[J]. 中国激光,2018,45(4):126—130.Li Chuan, Han Yiping, Zhao Wenjuan. 31 kW narrow-linewidth linearly polarized nanosecond polarization-maintaining all-fiber laser[J]. Chinese Journal of Laser,2018,45(4):126—130.
[4] Streek A, Lee M. Ultrafast material processing with high‐brightness fiber lasers[J]. Laser Technik Journal,2017,14(4):22—25.
[5] Kalaycioglu H, Elahi P, Ilday F O, et al. High-repetition-rate ultrafast fiber lasers for material processing[J]. IEEE Journal of Selected Topics in Quantum Electronics,2018,24(3):8800312.
[6] 张冲, 王冠, 杨志刚, 等. 脉冲光纤激光加工36MnVS4连杆裂解槽的研究[J]. 激光与红外,2018,48(3):285—290.Zhang Chong, Wang Guan, Yang zhigang, et al. Study on fracture splitting groove of 36MnVS4 connecting rod fabricated by pulse fiber laser[J]. Laser & Infrared ,2018,48(3):285—290.
[7] Kerse C, Kalayclolu H, Elahi P, et al. 3.5-GHz intra-burst repetition rate ultrafast Yb-doped fiber laser[J]. Optics Communications,2016,366(1):404—409.
[8] 李磐, 师红星, 符聪, 等. 激光清洗用高功率纳秒脉冲掺镱光纤激光器[J]. 激光与光电子学进展,2018,55(12):121406.Li Pan, Shi Hongxing, Fu cong, et al. High power nanosecond ytterbium-doped fiber laser for laser clean[J]. Laser & Optoelectronics Progress,2018,55(12):121406.
[9] 杨敬文, 张培培, 吕晓英, 等. 全国产化单纤高功率光纤激光器的研究[J]. 激光与红外,2018,48(3):318—321. Yang Jingwen, Zhang Peipei, Lv Xiaoying, et al. Study on localization single-mode high power fiber laser[J]. Laser & Infrared,2018,48(3):318—321.
[10] 刘华. 利用汉克尔变换设计高斯光束整形衍射元件的应用研究[J]. 中国光学,2016,9(2):277—283.Liu Hua. Gaussian beam shaping diffractive optical element designed by Hankel transformation [J]. Chinese Optics,2016,9(2):277—283.
[11] 夏国才, 孙小燕, 段吉安. 用于实现激光高效率加工的光束整形技术[J]. 激光与光电子学进展,2012,49(10):16—25.Xia Guocai, Sun Xiaoyan, Duan Jian. Beam shaping technologies for high efficiency laser fabrication[J]. Laser & Optoelectronics Progress,2012,49(10):16—25.
[12] 高瑀含, 安志勇, 李娜娜, 等. 高斯光束整形系统的光学设计[J]. 光学精密工程,2011,19(7):1464—1471.Gao Yuhan, An Zhiyong, Li Nana, et al. Optical design of Gaussian beam shaping [J]. Optics and Precision Engineering,2011,19(7):1464—1471.
[13] 包海廷, 欧阳名钊, 王志勇, 等. 基于DOE的标识光场整形系统设计[J]. 长春理工大学学报:自然科学版,2017,40(2):27—32.Bao Haiting, Ouyang Mingzhao, Wang Zhiyong, et al. Design of light field shaping system based on DOE identification[J]. Laser & Infrared Journal of Changchun University of Science and Technology:Natural Science Edition,2017,40(2):27—32.
[14] 刘子学, 冯奇斌, 吕国强. 用于直下式激光背光模组的衍射光学元件设计[J]. 光电子,2018,08(02):66—74. Liu Zixue, Feng Qibin, Lv Guoqiang. Diffractive optical element for direct-lit laser backlight unit[J]. Optoelectronics,2018,08(02):66—74.
[15] 陈寒, 邹淑珍, 于海娟, 等. 单模激光在多模光纤中的传输实验研究[J]. 激光与光电子学进展,2015,52(4):58—63.Chen Han, Zhou Shuzhen, Yu Haijuan, et al. Experimental study of the transmission in multimode fiber with a single mode laser[J]. Laser & Optoelectronics Progress,2015,52(4):58—63.
[16] 吴丽双. 激光经D形多模光纤输出的光场特性实验研究[J]. 激光与光电子学进展,2013,50(9):29—33.Wu Lishuang. Experimental study of the characteristics of the light field of the laser output through the D-shaped multimode fiber[J]. Laser & Optoelectronics Progress,2013,50(9):29—33.
[17] 金亮, 邹永刚, 丁晔, 等. 双包层光纤折射率研究及纤芯结构优化设计[J]. 强激光与粒子束,2013,25(10):2496—2500.Jin Liang, Zou Yonggang, Ding Ye, et al. Research and optimization on refractive index and core of double cladding fiber[J]. High Power Laser and Particle Beams,2013,25(10):2496—2500.