半导体激光器光栅—外腔光谱合束技术研究

发布时间：2018-05-16 06:11

本文选题：半导体激光器 + 光束质量　；参考：《中国工程物理研究院》2015年硕士论文

【摘要】：高功率、高光束质量是半导体激光器作为直接光源应用的重要技术指标,目前光栅-外腔光谱合束方法是直接半导体激光器(Direct Diode Laser, DDL)获得高亮度激光输出的最为有效方法之一,可以实现数十KW的高光束质量激光输出。美国TeraDiode公司利用麻省理学院林肯实验室光谱合束专利技术,将大量独立的半导体激光器合成一束高功率、高光束质量的激光束,使其达到现有工业级CO2、光纤和固体激光器的功率和光束质量水平。这种直接半导体激光器近期内将用于红外对抗、目标指示器、目标照射器和工业加工等领域,在长期目标上,将应用于定向能武器,例如路边炸弹远距离清除,反火箭弹、炮弹和迫击炮弹任务,以及防空任务等各方面应用。由此可以看出：光谱合束技术将成为半导体激光器光束整形合束方法的革新,使半导体激光器跻身于直接应用激光光源行列。本论文工作主要围绕光栅-外腔反馈光谱合束技术,展开高亮度半导体激光器光谱合束光源的研究,完成主要工作如下：1)介绍了提高输出光功率密度和输出光束质量的非相干合束技术：光栅-外腔反馈光谱合束技术近几年来的国内外发展现状,梳理了半导体激光器外腔光谱合束技术发展的若干重要动向,为下一步的研究工作提供参考指导。同时就该工作完成了一篇学术调研论文,发表在《激光与光电子学进展》2015年52卷。2)根据实验过程中遇见的问题,提出了光谱互锁的概念,并就其造成原因做了简单的分析和实验验证,提出了几种有效的抑制合束单元间光谱互锁的方法。3)为了满足激光泵浦需要,设计了窄光谱输出的光谱合束光学系统,获得了谱宽宽度为3.25nm的激光输出,获得的该光谱结果,国内外尚未出现报道,该结果发表在《中国激光》2015年42卷。在此基础上完成了该窄光谱高亮度光源结构的小型化设计,获得授权实用新型发明专利1项。4)为了获得较高合束功率和快慢轴方向上等光束质量激光输出,设计了基于透射光栅的3-Bar叠阵光谱合束光学系统,并且首次提出了将平凸柱面镜作为外腔反馈镜的结构形式,很好的实现了光谱互锁的抑制和光束质量的改善。5)提出了分束反馈式的光谱合束结构,来实现最终合束输出光束质量的改善,并获得了授权实用新型发明专利1项。
[Abstract]:High power, high beam quality is an important technical index of semiconductor laser as a direct light source. At present, grating and external cavity spectral beam combination method is one of the most effective methods to obtain high brightness laser output by direct Diode Laser, DDL). Dozens of kilowires of high beam quality laser output can be realized. The TeraDiode Company of the United States uses the patented technology of the Lincoln Laboratory of Massachusetts Institute of Science to synthesize a large number of independent semiconductor lasers into a laser beam with high power and high beam quality. It reaches the existing power and beam quality of industrial CO _ 2, fiber and solid-state lasers. This type of direct semiconductor laser will be used in the near future in areas such as infrared countermeasures, target indicators, target irradiators and industrial processes, and in the long term will be used for targeted energy weapons, such as long-range clearance of roadside bombs, anti-rockets, etc. Artillery shells and mortar shells, as well as air-defense tasks and other aspects of the application. It can be seen that the spectral beam bonding technique will become the innovation of laser beam shaping method and make semiconductor laser become one of the direct application of laser light source. In this paper, the research of spectral beam binding of high brightness semiconductor laser is carried out around the grating external cavity feedback spectral beam binding technology. The main work of this paper is as follows: (1) the incoherent beam combination technology to improve the output power density and the output beam quality is introduced: the development of the grating external cavity feedback spectral beam bonding technology in recent years at home and abroad. Some important trends in the development of laser diode external cavity spectroscopic beam bonding technology are reviewed, which provides a reference for the next research work. At the same time, an academic research paper on this work was completed, published in the Progress of Laser and Optoelectronics 2015 (vol. 52. 2) based on the problems encountered in the experiment, the concept of spectral interlocking was proposed. In order to meet the need of laser pumping, a narrow spectral beam coupling optical system is designed, and several effective methods to suppress the spectral interlocking between beam units are proposed in order to meet the needs of laser pumping. The results are as follows: (1) in order to meet the needs of laser pumping, a narrow spectrum output optical system is designed. The laser output with a width of 3.25nm has been obtained, which has not been reported at home and abroad, and published in 42 volumes of China Laser 2015. On this basis, the miniaturization design of the narrow spectrum and high brightness light source structure has been completed. In order to obtain the laser output with high beam matching power and equal beam quality along the fast and slow axis, a patent for a utility model has been granted. The optical system of 3-Bar stacked array spectral beam combination based on transmission grating is designed, and the structure of the flat convex cylindrical mirror as the external cavity feedback mirror is proposed for the first time. The suppression of spectral interlocking and the improvement of beam quality are well realized. (5) A split-beam feedback structure is proposed to improve the output beam quality of the final beam, and a patent for utility model invention is obtained.
【学位授予单位】：中国工程物理研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.4

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