880nm双端泵浦论文：880nmLD双端端面泵浦Nd-YVO_4-LBO全固态连续红光激光器.doc

880nm双端泵浦论文：880nmld双端端面泵浦nd:yvo_4/lbo全固态连续红光激光器【中文摘要】激光二极管泵浦的全固态激光器由于其自身在效率、光束质量、稳定性、结构、寿命等方面的显著优势,是近年来国际上发展速度最快的一种新型激光器；其应用范围已经遍及科研、军事、工业等国民经济的重要领域；其中,全固态红光激光器在激光医学、彩色显示、激光存储以及作为可调谐激光器的泵浦源等领域受到了国内外的高度重视。本文采用直接泵浦技术,通过双端端面偏振泵浦nd:yvo4复合晶体,合理设计三镜折叠激光谐振腔,优化实验条件,在泵浦功率为51w时,获得了最大输出功率为12.4w的连续单横模1.34m激光输出；在此基础上,我们设计了z型四镜折叠激光谐振腔,并采用i类临界相位匹配晶体lbo进行内腔倍频,获得了高功率连续单横模671nm红光激光输出；当注入晶体的功率为42.5w时,激光器最大输出功率为5.2w,光-光转换效率为12.2%,激光器1小时功率稳定性优于2.5%。本论文主要内容概括如下：第一章：绪论回顾了激光二极管泵浦的全固态激光器的历史发展概况,着重对全固态1.3m激光器和671nm红光激光器的应用以及研究现状作了详细的介绍；同时,对直接泵浦技术的发展及研究现状作了简单的概述。第二章：全固态1.3mnd:yvo4激光器首先介绍了激光晶体nd:yvo4的特性；然后从理论上分析了激光晶体热效应的来源,并提出了降低热效应的方法措施；进一步模拟了实验中所用晶体的温度分布,并测量了晶体的热焦距：根据热焦距的测量结果以及谐振腔的设计原则,设计了三镜折叠激光谐振腔；通过优化实验条件,获得了最大输出功率为12.4w的1.34m连续单横模激光输出,并测量了输出激光的各项性能指标。第三章：全固态nd:yvo4/lbo红光激光器首先对常用的内腔倍频非线性晶体进行了比较,结合实际情况选取了类临界相位匹配晶体lbo作为实验中的倍频晶体；然后进一步对所选倍频晶体lbo做了详细的介绍,包括其物理、化学及光学等性质：考虑到影响倍频效率等因素,并结合谐振腔的设计原则,设计了z型四镜激光谐振腔；通过改变谐振腔腔长来控制激光晶体和倍频晶体处的基频光光斑半径,从而达到最佳的倍频转化效率；最终,在泵浦功率为42.5w时,获得了最大输出功率为5.2w的连续单横模671nm红光输出,光-光转换效率达到12.2%,激光器1小时功率稳定性优于2.5%。第四章：总结与展望【英文摘要】diode-pumped solid-state lasers have been the fastest growing laser in recent years and applied in important areas of national economy such as scientific researches, military affairs and industry and so on due to its advantages in high efficiency, excellent beam quality, high reliability, compact configuration, and long lifetime. moreover, all-solid-state red lasers have been attracting great attention in the field of laser biomedical, color display, laser storage and pumping sources for tunable lasers.in this thesis, through using directly pumped technology, we achieved a cw nd:yvo4temoo laser operating at1.34m by double-end polarization pumping composite crystal. through designing three-mirror folded cavity and optimizing the experimental conditions, the maximum output power of12.4w was obtained under pump power of51w. on this basis, we achieved a cw tem00laser operating at671nm by designing z shaped four-mirror folded cavity, and using a type-i critical phase-matched lbo crystal as the nonlinear crystal for intracavity frequency doubling. maximum output power of5.2w was obtained under pump power of42.5w, with optical-to-optical conversion efficiency of12.2%. the stability of the red laser output was better than2.5%in the given one hour.the main contents of the dissertation are as follows:chapter1:introductionthe progressing history and developing tendency of laser diode pumped solid state lasers were reviewed. especially the application and research status of1.3m and671nm red lasers were introduced in detail. furthermore, the development and research status of directly pumped technology were summarized briefly.chapter2:all-solid-state nd:yvo4laser at1.3mfirst, many properties of the nd:yvo4crystal were introduced. then the sources of the thermal effect was analyzed in theory, and how to reduce it was put forward. furthermore, the temperature distribution of the crystal used in our experiment was simulated and the thermal focal length was measured. finally, the three-mirror folded cavity was designed according to the measurement of the thermal focal length and principles of the designing the cavity. by optimizing the experimental conditions, the cw temoo laser operating at1.34m of maximum output power of12.4w was obtained and its performance indexes are measured.chapter3:all-solid-state nd:yvo4/lbo red laserfirst, different nonlinear crystals for intracavity frequency doubling were compared, a type-i critical phase-matched lbo crystal was selected as the nonlinear crystal for intracavity frequency doubling. then the physical properties, chemical properties and optical properties of lbo were introduced in detail. taking into account of influencing factors on frequency-doubling efficiency, and combining with principles of the designing the cavity, z shaped four-mirror folded cavity was designed. the beam waist in nd:yvo4and in lbo were controlled by changing the length of cavity in order to achieve the best efficiency of frequency-doubling. finally, the cw tem00red laser operating at671nm of maximum output power of5.2w was obtained under pump power of42.5w, with optical-to-optical conversion efficiency of12.2%. the stability of the red laser output was better than2.5%in the given one hour. chapter4: conclusions and outlook【关键词】880nm双端泵浦 热效应 内腔倍频 1.34m激光 671nm红光【英文关键词】dual-end-pumped at880nm the thermal effect intracavityfrequency doubling 1.34m laser 671nm red laser【目录】880nmld双端端面泵浦nd:yvo_4/lbo全固态连续红光激光器中文摘要8-10abstract10-11第一章 绪论12-181.1 全固态激光器的发展概况13-141.2 全固态1.3m激光器的应用及研究现状141.3 全固态红光激光器的应用及研究现状14-151.4 直接泵浦技术的发展及研究现状15-161.5 本论文的主要工作16-18第二章 全固态1.3m nd：yvo_4激光器18-342.1 nd：yvo_4晶体的性质18-212.2 激光晶体的热效应及改善方法21-242.2.1 减小进入晶体内的热量21-222.2.2 对晶体进行有效地散热222.2.3 晶体内温度分布22-232.2.4 测量激光晶体的热焦距23-242.3 1.3 m激光谐振腔的设计24-282.4 实验装置及结果28-322.4.1 实验装置28-292.4.2 实验结果29-322.5 本章小结32-34第三章 全固态nd：yvo_4/lbo内腔倍频红光激光器34-463.1 倍频晶体的选择34-35