单管半导体激光器光纤耦合技术研究

发布时间：2018-04-01 22:05

本文选题：半导体激光器　切入点：快慢轴准直　出处：《苏州大学》2015年硕士论文

【摘要】：高功率半导体激光器在材料加工、激光器泵浦以及国防安全等领域应用十分广泛。半导体激光器的堆栈(stack)与巴条(bar)可以实现很高的输出功率,但是其光束质量较差,难以耦合进入较细芯径的光纤中。单管半导体激光器光束质量好、寿命长、调试方便,多个单管半导体激光器合束后可以达到较高的功率,容易耦合进较细芯径的光纤之中,因此对单管半导体激光器光纤耦合的研究具有十分重要的意义。本论文从方案设计、理论模拟以及实验验证等方面进行了单管半导体激光器光纤耦合技术研究。本论文设计了一种单管半导体激光器光纤耦合模块,其中半导体激光器的中心波长为980 nm,单管半导体激光器的输出功率为12 W。模块中采用非球面柱透镜和球面柱透镜对16个单管半导体激光器输出光束进行准直,经过等腰直角棱镜空间合束以及一维伽利略望远系统慢轴扩束后,利用三片式消球差聚焦镜将光束耦合进芯径100μm、数值孔径(NA)0.22的光纤中,耦合效率理论上可达88.9%。全系统模拟结果表明:该方案可实现137 W的激光输出,全系统效率可达71%。为光纤耦合实验奠定了理论基础。对单管半导体激光器光纤耦合模块各部件的设计进行了容差分析。采用光线追迹法模拟了快慢轴准直镜的位置偏差与角度偏差、等腰直角棱镜的位置偏差以及扩束系统的位置偏差对全系统效率的影响。模拟结果表明,快轴准直镜在快轴方向的位置偏差对全系统效率的影响最大,其位置偏差应该控制在-470~500 nm以内。该分析结果对于光纤耦合实验具有一定的指导作用。选取模块中空间排布上位于两边带与中心共3个单管半导体激光器开展了光纤耦合实验,实验结果表明:半导体激光器光纤耦合的全系统效率为67.1%,实验结果与设计值基本吻合。该方案满足高功率半导体激光器光纤耦合的应用要求。
[Abstract]:High power semiconductor lasers are widely used in material processing, laser pumping, and national defense security. The stack stack and barbar of semiconductor lasers can achieve high output power, but the beam quality is poor. It is difficult to couple into fine core diameter fiber. Single tube semiconductor laser beam quality is good, life is long, debugging is convenient. After multiple single tube semiconductor laser beams are closed, it can achieve higher power and is easily coupled into fine core diameter optical fiber. Therefore, it is of great significance to study the fiber coupling of single-transistor semiconductor lasers. Theoretical simulation and experimental verification are carried out to study the fiber coupling technology of single-tube semiconductor laser. In this paper, a fiber coupling module of single-tube semiconductor laser is designed. The central wavelength of semiconductor laser is 980 nm and the output power of single-tube semiconductor laser is 12 w.The output beam of 16 single-tube semiconductor lasers is collimated by aspheric cylindrical lens and spherical cylindrical lens in the module. After the spacial beam of isosceles right angle prism and the slow axial beam of one dimensional Galileo distant system are expanded, the beam is coupled into a fiber with a core diameter of 100 渭 m and a numerical aperture of 0.22 using a three-slice Aspheric focusing mirror. In theory, the coupling efficiency can reach 88.9.The whole system simulation results show that this scheme can realize the laser output of 137W. The efficiency of the whole system can reach 71.The theoretical foundation for the fiber coupling experiment is established. The tolerance analysis of the components of the fiber coupling module of a single transistor semiconductor laser is carried out. The position of the fast and slow axis collimation mirror is simulated by the ray tracing method. Set deviation and angle deviation, The effect of the position deviation of the isosceles right angle prism and the position deviation of the beam expansion system on the efficiency of the whole system. The simulation results show that the position deviation of the fast axis collimating mirror in the fast axis direction has the greatest influence on the efficiency of the whole system. The position deviation should be controlled within -470 nm. The results of the analysis can be used to guide the fiber coupling experiment. Three single-transistor semiconductor lasers with two sides and one center in the space arrangement of the module are selected to carry out the fiber coupling experiment. The experimental results show that the overall system efficiency of fiber coupling is 67.1, and the experimental results are in good agreement with the designed values. This scheme can meet the requirements of fiber coupling of high power semiconductor lasers.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.4

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