高亮度绿光半导体激光器光纤耦合系统设计与仿真  

Design and Simulation of High Brightness Fiber Coupling System of Green Laser Diodes

作　　者：丁兵 赵鹏飞[1] 段程芮 娄博杰 林学春[1] Ding Bing;Zhao Pengfei;Duan Chengrui;Lou Bojie;Lin Xuechun(Laboratory of All-Solid-State Light Sources,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Science,Beijing 100049,China;Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国科学院半导体研究所全固态光源实验室,北京100083 [2]中国科学院大学材料科学与光电技术学院,北京100049 [3]北京工业大学材料与制造学部激光工程研究院,北京100124

出　　处：《中国激光》2021年第5期210-217,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2016YFB0401804)。

摘　　要：针对矩形阵列光束与光纤耦合的角度填充系数低,以及未能充分利用光纤数值孔径的缺点,提出密堆积阵列光束的光纤耦合方式以最大化角度填充系数,从而提升光纤耦合的输出亮度。基于该排布方式设计无像差平行平板缩束装置,相比于望远镜缩束系统,该装置可保持光束发散角不变,消除阵列光束之间的暗区,改善组合光束的光束质量。仿真结果表明,该装置可将14支功率为1.5 W绿光单管耦合进数值孔径为0.15和芯径为105μm的光纤中,获得93.75%的光纤耦合效率,输出功率为19.13 W,对应亮度为3.125 MW·cm^(-2)·Sr^(-1),系统的总光-光传输效率达91.10%。Objective In the field of ultrashort pulse laser,green laser diodes(LDs)as the pump source of Ti:sapphire laser have received increasing attention.It has been reported that increasing the power of the green laser-pumping source can further improve the output power of Ti:sapphire lasers.However,compared with gallium arsenide-based materials in the near-infrared band,gallium nitride-based materials with a wider bandgap can radiate green light and are prone to produce defects in the growth process,which reduce the radiation efficiency and output power.The maximum power of a single LD commercially available is 1.5 W.Thus,it is necessary to use a beam combining technology to improve the output power.Presently,the incoherent beam combining methods,such as spatial or polarized combination,are mostly used to improve the output power of LD modules.However,it is found that the combined beam,in most cases,is a rectangular beam array.When such a beam is focused by a coupling lens,the angular filling factor(AFF)is low(AFF is defined in Section 2.1),resulting in wasting part of the angle space.If the beam filling can be performed in this region,the brightness of the fiber output can be improved further.The brightness of the pump source is also the key factor to increase the output power of the titanium sapphire laser.This study proposes a method for increasing the AFF to fully use the angle space by combining beams in a closest-packed structure.Based on the proposed method,a high-brightness fiber-coupled green LD module is demonstrated using ZEMAX.Methods To solve the problem of low AFF and the inability of the numerical aperture of a fiber to be fully used when the beam in a rectangular array is coupled into the fiber,we propose to arrange the beams according to a closest-packed structure.Based on this arrangement,we design a high-brightness fiber-coupled module of green LDs.First,we divide 141.5-W green LDs into two groups of 7 each and placed them on the six vertices and centers of the regular hexagon to form a dense struct

关 键 词：激光光学 半导体激光器 绿光 光束整形 高亮度 

分 类 号：O439[机械工程—光学工程]