半导体泵浦掺镝黄光激光特性研究

发布时间：2018-04-01 06:13

本文选题：半导体泵浦　切入点：掺镝　出处：《南京理工大学》2017年硕士论文

【摘要】：黄光激光器在荧光显微成像、流式细胞术、眼科光凝等生物医学领域有着重要的应用前景。近年来,LD泵浦的全固态黄光激光器发展迅速,高稳定性、高效率、高光束质量的全固态黄光激光器是当前激光领域内的研究热点。目前的全固态黄光激光器面临着一个严峻的问题:绝大多数黄光激光器依赖于通过红外激光的非线性频率转换方式实现。这就造成了,一方面,非线性转换过程中基频光模式竞争导致黄光输出功率的稳定性较差、光束质量不佳;另一方面,系统的复杂程度直接导致了激光器的体积较大,从而对激光器的可靠性造成了严重的影响,难以满足实际应用的要求。本文旨在提出一种实现稳定性好、体积小的医用黄光激光器的新思路。采用半导体泵浦掺Dy3+激光介质的一步式方案,实现高稳定性、小体积、高亮度的黄光激光输出。主要做了如下研究工作:理论方面:探索一种高稳定性、小体积全固态黄光激光器的实现方法。根据掺Dy3+激光介质的特殊能级结构,采用半导体激光泵浦,利用4Fg/2→6H13/2的能级跃迁,无需非线性频率转化,直接可以获得黄光波段的激光,从根本上解决困扰全固态黄光激光器的稳定性问题。实验方面:首先,对比分析Dy:YAG单晶、Dy:YAG陶瓷和Dy:BSO单晶的光学性能;然后,设计对热效应不灵敏的谐振腔,并优化泵浦光和振荡光之间的模式匹配;最后,在理论分析和数值模拟的基础上,首次在国内通过Dy:YAG单晶实现了全固态582.7 nm黄光激光输出。
[Abstract]:Yellow laser has an important application prospect in the fields of fluorescence microscopic imaging, flow cytometry, ophthalmic photocoagulation and other biomedical fields.In recent years, the all-solid-state yellow laser pumped by LD-pumped laser is a hot spot in the field of laser field, with rapid development, high stability, high efficiency and high beam quality.At present, the all-solid-state yellow laser is faced with a severe problem: most yellow lasers depend on the nonlinear frequency conversion mode of infrared laser.On the one hand, the fundamental frequency mode competition in the nonlinear conversion process leads to poor stability of the yellow light output power and poor beam quality; on the other hand, the complexity of the system directly leads to the larger volume of the laser.Thus, the reliability of the laser is seriously affected and it is difficult to meet the requirements of practical application.In this paper, a new idea is proposed to realize the good stability and small volume of medical yellow laser.A one step scheme of semiconductor pumped Dy3 doped laser medium is used to realize the yellow laser output with high stability, small volume and high brightness.The main work is as follows: in theory, a high stability, small volume all-solid-state yellow laser is studied.According to the special energy level structure of Dy3 doped laser medium, the laser in yellow wave band can be directly obtained by using semiconductor laser pump and the energy level transition of 4Fg/2 6H13/2 without nonlinear frequency conversion.The stability problem of all-solid-state yellow laser is solved fundamentally.Experimental aspects: firstly, the optical properties of Dy:YAG single crystal Dy: YAG ceramics and Dy:BSO single crystal are compared and analyzed; then, the resonator which is not sensitive to thermal effect is designed, and the mode matching between pump light and oscillating light is optimized.On the basis of theoretical analysis and numerical simulation, the all-solid-state 582.7 nm yellow laser output is realized by Dy:YAG single crystal in China for the first time.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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