基于反抛物线型光纤的TE_(01)和TM_(01)模式输出激光器
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摘要
提出一种反抛物线型掺铒光纤,该光纤可以实现二阶模式组中简并矢量模式的有效分离。将其作为光纤激光器的增益介质,采用数值方法分析光纤中铒离子掺杂分布、铒离子掺杂浓度、光纤长度和抽运光功率对掺铒光纤激光器输出模式的影响。通过在光纤不同环形区域内掺杂铒离子,可以实现TE_(01)模式或TM_(01)模式的单独输出,并且激光器的斜率效率分别高达67.4%和63.5%,输出模式纯度分别高达99.97%和99.99%。所提的基于反抛物线型掺铒光纤的激光器具有斜率效率高、输出模式纯度高的优势,该光纤激光器可应用于高功率激光器、光纤通信和光纤传感等领域。
An anti-parabolic erbium-doped fiber is proposed to effectively separate the degenerate vector modes in the second-order mode group. The proposed fiber is used as the gain medium of a laser, and the effects of erbium-dopant distribution, erbium-dopant concentration, fiber length, and pump power upon the output mode of the erbium-doped fiber laser are analyzed through numerical investigation. The TE_(01) or TM_(01) modes are obtained separately by doping erbium in different annular regions of the proposed fiber, and the slope efficiencies of the proposed fiber laser can reach 67.4% and 63.5%, with an output-mode purity reaching 99.97% and 99.99%, respectively. The proposed anti-parabolic-fiber-based erbium-doped laser has the merits of a high slope efficiency and high mode purity, and has many applications such as in high power lasers, optical-fiber communications, and optical-fiber sensing systems.
An anti-parabolic erbium-doped fiber is proposed to effectively separate the degenerate vector modes in the second-order mode group. The proposed fiber is used as the gain medium of a laser, and the effects of erbium-dopant distribution, erbium-dopant concentration, fiber length, and pump power upon the output mode of the erbium-doped fiber laser are analyzed through numerical investigation. The TE_(01) or TM_(01) modes are obtained separately by doping erbium in different annular regions of the proposed fiber, and the slope efficiencies of the proposed fiber laser can reach 67.4% and 63.5%, with an output-mode purity reaching 99.97% and 99.99%, respectively. The proposed anti-parabolic-fiber-based erbium-doped laser has the merits of a high slope efficiency and high mode purity, and has many applications such as in high power lasers, optical-fiber communications, and optical-fiber sensing systems.
引文
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[19] Ung B,Vaity P,Wang L,et al.Few-mode fiber with inverse-parabolic graded-index profile for transmission of OAM-carrying modes[J].Optics Express,2014,22(15):18044-18055.
[20] Liao S Y,Gong M L,Zhang H T.Selection of doping radius for part-doped fibers[J].Chinese Journal of Lasers,2009,36(11):2836-2841.廖素英,巩马理,张海涛.部分掺杂光纤掺杂半径的选择[J].中国激光,2009,36(11):2836-2841.
[21] Townsend J E,Poole S B,Payne D N.Solution-doping technique for fabrication of rare-earth-doped optical fibers[J].Electronics Letters,1987,23(7):329-331.
[22] Gong M L,Yuan Y Y,Li C,et al.Numerical modeling of transverse mode competition in strongly pumped multimode fiber lasers and amplifiers[J].Optics Express,2007,15(6):3236-3246.
[2] Li J L.Research on fiber laser source to generate single mode TM01 and TE01[D].Beijing:Beijing Jiaotong University,2014.李觉灵.单模输出TM01和TE01模式光纤激光源的研究[D].北京:北京交通大学,2014.
[3] Li Y M,Gong L,Li D,et al.Progress in optical tweezers technology[J].Chinese Journal of Lasers,2015,42(1):0101001.李银妹,龚雷,李迪,等.光镊技术的研究现况[J].中国激光,2015,42(1):0101001.
[4] Zhou Z H,Zhang Y L,Zhu L Q.Trapping and manipulation of microparticles using radially polarized beams[J].Journal of Electronic Measurement and Instrumentation,2016,30(7):1016-1022.周哲海,张玉灵,祝连庆.基于径向偏振光束的微粒捕获与操控[J].电子测量与仪器学报,2016,30(7):1016-1022.
[5] Fatemi F K,Bashkansky M,Oh E,et al.Efficient excitation of the TE01 hollow metal waveguide mode for atom guiding[J].Optics Express,2010,18(1):323-332.
[6] Yu A P.Study on super-oscillation focusing device for radially polarized light[D].Chongqing:Chongqing University,2017.余安平.径向偏振光超振荡聚焦器件研究[D].重庆:重庆大学,2017.
[7] Meng J X.Electron acceleration by an circularly polarized electromagnetic wave[D].Beijing:Beijing University of Chemical Technology,2016.孟建勋.圆极化电磁波加速带电粒子的机制研究[D].北京:北京化工大学,2016.
[8] Li J L,Ueda K I,Musha M,et al.Generation of radially polarized mode in Yb fiber laser by using a dual conical prism[J].Optics Letters,2006,31(20):2969-2971.
[9] Thirugnanasambandam M P,Senatsky Y,Ueda K I.Generation of radially and azimuthally polarized beams in Yb:YAG laser with intra-cavity lens and birefringent crystal[J].Optics Express,2011,19(3):1905-1914.
[10] Zou L,Yao Y,Li J L.High-power,efficient and azimuthally polarized ytterbium-doped fiber laser[J].Optics Letters,2015,40(2):229-232.
[11] Lin D,Daniel J M O,Gecevi ytterbium-doped fiber laser with radially polarized output[J].Optics Letters,2014,39(18):5359.
[12] Wei K Y,Zhang W D,Huang L G,et al.Generation of cylindrical vector beams and optical vortex by two acoustically induced fiber gratings with orthogonal vibration directions[J].Optics Express,2017,25(3):2733-2741.
[13] Liu T,Chen S P,Hou J.Selective transverse mode operation of an all-fiber laser with a mode-selective fiber Bragg grating pair[J].Optics Letters,2016,41(24):5692-5695.
[14] Zhou Y,Yan K,Chen R S,et al.Resonance efficiency enhancement for cylindrical vector fiber laser with optically induced long period grating[J].Applied Physics Letters,2017,110(16):161104.
[15] Zhao Y H,Wang T X,Mou C B,et al.All-fiber vortex laser generated with few-mode long-period gratings[J].IEEE Photonics Technology Letters,2018,30(8):752-755.
[16] Wang F,Shi F,Wang T,et al.Method of generating femtosecond cylindrical vector beams using broadband mode converter[J].IEEE Photonics Technology Letters,2017,29(9):747-750.
[17] Wan H D,Wang J,Zhang Z X,et al.Passively mode-locked ytterbium-doped fiber laser with cylindrical vector beam generation based on mode selective coupler[J].Journal of Lightwave Technology,2018,36(16):3403-3407.
[18] Wei J C.Theoretical research and design of vortex fiber[D].Beijing:Beijing Jiaotong University,2017.卫俊超.涡旋光纤的理论研究与设计[D].北京:北京交通大学,2017.
[19] Ung B,Vaity P,Wang L,et al.Few-mode fiber with inverse-parabolic graded-index profile for transmission of OAM-carrying modes[J].Optics Express,2014,22(15):18044-18055.
[20] Liao S Y,Gong M L,Zhang H T.Selection of doping radius for part-doped fibers[J].Chinese Journal of Lasers,2009,36(11):2836-2841.廖素英,巩马理,张海涛.部分掺杂光纤掺杂半径的选择[J].中国激光,2009,36(11):2836-2841.
[21] Townsend J E,Poole S B,Payne D N.Solution-doping technique for fabrication of rare-earth-doped optical fibers[J].Electronics Letters,1987,23(7):329-331.
[22] Gong M L,Yuan Y Y,Li C,et al.Numerical modeling of transverse mode competition in strongly pumped multimode fiber lasers and amplifiers[J].Optics Express,2007,15(6):3236-3246.