Improved method for semiconductor laser coupling
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摘要:提出了一种脱离国外模式的半导体 耦合新方法,使用该方法既可以直接将半导体 耦合成亮度均匀、光束参数积(BPP)值在两个方向相等的方形光斑,也可和光纤耦合得到一个圆形光斑,且只用球面镜和柱面镜两种光学元件,不需采用国外方法中用到的其它类型微光纤元件。将系统的出瞳作为光斑来解决亮度均匀分布问题;通过消除光源间隔对BPP值的影响来减小慢轴的BPP值;利用点光源的特点使快轴和慢轴的BPP值相等。采用该方法设计了各种要求和规格的半导体 耦合光学系统,如本文设计实例中的参数为:巴条上的光源数为19个,巴条数为21个,故光源总数为399个。得到的方形光斑尺寸为0.6 mm0.6 mm,NA值为0.22。此外,和直径为1 mm 光纤耦合还得到了一圆形光斑。与国外方法比较,该方法结构简单,工艺要求低,更适用于高功率、低BPP值的半导体 器。Abstract:This paper attempts to look for a new method to obtain a square spot whose brightness distribution is homogeneous and the value of BPP is equal in two directions. Moreover, a spherical spot may be obtained too, if it is coupled with a fiber. The method only adopts the cylindrical and the spherical lenses and no other kinds of micro optical elements unlike the methods in foreign countries. An exit pupil of the system is taken as a spot to solve the problem of brightness homogeneous distribution, and the spacing influence of the light sources upon the value of BPP is clean up to decrease the value of BPP of the slow axis. Furthermore, the characteristic of the point light source is utilized to allow the BPP values of the fast axis and the slow axis to be equaled. Finally, this new method is used to design the coupling optical systems with different demands and specifications. The design example in this paper shows that there are 19 light sources at a bar, and the number of the bars is 21, then the total number of the light sources is 399. The size of the square spot obtained is 0.6 mm0.6 mm and NA is 0.22. The spherical spot can be obtained if the system is coupled with the fiber with a diameter of 1 mm. Compared to the foreign methods, the construction of the new method is simpler and the demand for crafts is lower. The new method is suitable for the semiconductor lasers with high power and low values of BPP.
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Key words:
- semiconductor laser/
- diode laser/
- fiber coupling/
- beam shaping
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[1] DORSCH,HENNIG P,NICKEL M. High-brightness Fiber-coupled laser diode module[J].SPIE,1998,3285:12-198. [2] DORSCH F,DAIMINGER F X,HENNIG P,et al.. 2 KW cw-fiber-coupled diode laser system[J].SPIE,2000,3889:45-53. [3] WANG ZH J,BAR D,GHEEN A Z,et al.. Optical coupling system for a high power diode-pumped solid state laser:US 6,377,410 B1.2002-02-02. [4] MICHAEL,BERGER L,BRAUCH U,et al.. Fiber coupling of single-modes with power-density conservation[J].SPIE,1996,2682:188-195. [5] HEINEMANN S,LEININGER L. Fiber coupled diode lasers and beam-shaped high-power stacks[J].SPIE,1998,3267:115-124. [6] FAIRELOTH B. High brightness high power fiber coupled diode laser system for material processing and laser pumping[J].SPIE,2003,4973:34-41. [7] TANG Z,ZHANG R. Optimization of fiber-optic coupling and alignment tolerance for coupling between a laser diode and a wedged single-mode fiber[J].Optics Commun.,2001,199:95-101. [8] SOSNIND Y G. Diode laser beam shaping and propagation characteristics[J].SPIE,2009,7221:2-5. [9] 王鹏程,邓永丽,张立平,等. 高亮度半导体 阵列光纤耦合模块[J]. 发光学报,2012,33(12):1335-1341. WANG P CH,DENG Y L,ZHANG L P,et al.. High brightness fiber coupled diode laser module[J].Chinese J. Luminescence,2012,33(12):1335-1341.(in Chinese) [10] 郝明明,朱洪波,秦莉,等. 百瓦级高亮度光纤耦合半导体 模块的研制[J]. 发光学报,2012,33(6):651-659. HAO M M,ZHU H B,QIN L,et al.. Reaearch on high brightness fiber coupled diode laser module with hundred watts class output power[J].Chinese J. Luminescence,2012,33(6):651-659.(in CHinese) [11] 朱洪波,刘云,郝明明,等. 高效率半导体 器光纤耦合模块[J]. 发光学报,2011,32(11):1147-1151. ZHU H B,LIU Y,HAO M M,et al.. High efficiency module of fiber coupled diode laser[J].Chinese J. Luminescence,2011,32(11):1147-1151.(in Chinese) [12] 张俊,冯莹,陈爽. 高功率 光纤耦合系统设计与分析[J]. 光学与光电技术,2007,5(1):47-52. ZHANG J,FENG Y,CHEN SH. Design and analysis of coupling system between fibers for high power laser[J].Opt. Optoelectronic Technology,5(1):47-52.(in Chinese). [13] 彭航宇,单肖楠,马军龙,等. 2600 W偏振耦合高效率半导体 光源[J]. 发光学报,2011,32(10):1036-1040. PENG H Y,LIU Y,SHAN X N,et al.. 2600 W high efficiency laser diode source with polarization coupling[J].Chinese J. Luminescence,2011,32(10):1036-1040.(in Chinese). [14] 张俊,彭航宇,刘云,等. 适用于金属薄板焊接的柔性光纤耦合半导体 加工光源[J]. 发光学报,2012,33(8):895-900. ZHANG J,PENG H Y,LIU Y,et al.. Fiber-coupled diode laser flexible processing source for metal sheet welding[J].Chinese J. Luminescence,2012,33(8):895-900.(in Chinese) [15] 冯广智,顾媛媛,单肖楠, 等.808 nm大功率半导体 迭阵偏振耦合技术[J]. 发光学报,2008,29(4):695-700. FENG G ZH,GU Y Y,SHAN X N,et al.. 808 nmhigh power diode laser stack with polarization coupling[J].Chinese J. Luminescence,2008,29(4):695-700.(in Chinese)
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