780纳米波段自倍频激光晶体及器件研究

项目名称： 780纳米波段自倍频激光晶体及器件研究

项目编号： No.50802094

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 无线电电子学、电信技术

项目作者： 陈雨金

作者单位： 中国科学院福建物质结构研究所

项目金额： 20万元

中文摘要： 780纳米波段激光在微量气体探测、医学、环境监测、超冷原子物理研究以及量子通讯等众多高新技术领域都有重要应用。现有的该波段激光器在输出光束质量或器件紧凑性和使用方便性等方面均存在一些不足，使其在许多领域无法得到应用。我们采用1.5-1.6微米波段高性能铒镱双掺四硼酸铝盐非线性激光晶体作为增益介质，利用该类晶体优秀的激光和非线性光学性能，开展780纳米波段自倍频固体激光研究。通过对晶体生长工艺、介质厚度、激活离子浓度、光谱和激光性能参数、晶体热效应、脉冲及自倍频激光运转等各个方面的深入分析和研究，总结获得了基波和自倍频激光有效运转的一些技术路线。获得了迄今效率最高（26%）的半导体激光泵浦一体化1.5-1.6微米波段微片激光；利用声光调Q器件，在国际上首次实现了晶体介质中高脉冲能量的腔内倍频780nm（30微焦）主动调Q脉冲激光运转；采用沿自倍频相位匹配角切割的Er:Yb:YAl3(BO3)4晶体作为增益介质，首次实现了20微焦的自倍频800nm固体脉冲激光输出。本项目至今共正式发表SCI论文13篇，申请中国发明专利4项。

中文关键词： 铒镱双掺四硼酸铝盐晶体；1.5-1.6微米；780纳米；自倍频；声光调Q脉冲

英文摘要： Laser around 780nm has important applications in many high technical fields, such as trace gas sensing, medicine, enviromental monitoring, ultra-cold atomic physics,and quantum communication. At present, the available 780nm lasers have some deficiencies in beam quality, compactness, and convenience, etc., which restrain their applications in many areas. Using the Er:Yb:RAl3(BO3)4 nonlinear laser crystals, which have the excellent laser performance at 1.5-1.6 micrometer and nonlinear optical characteristic, as the gain media, self-frequency-doubling 780nm solid-state laser is researched.By investigating on the crystal growth technique, thickness of gain medium, concentration of dopant ions,spectroscopic and laser performance parameters, thermal effect, pulse and self-frequency-doubling lasers,some techincal schemes for realizing the efficient fundamental and self-frequency-doubling laser operations have been summarized.The most efficient diode-pumped monolithic 1.5-1.6 micrometer micro-laser with slope efficiency up to 26% has been achieved. High performanced acousto-optic Q-switched intracavity frequency doubling 780nm pulse laser with energy of 30 microjoule have been realizied for the first time.Using an Er:Yb:YAl3(BO3)4 crystal cut for type I phase-matched operation as gain medium,self-frequency-doubling solid-state 800nm acousto-optic Q-switched pulse laser with energy of 20 microjoule has been obtianed firstly.Thirteen papers have been published in SCI journals and four inventions have been applied for chinese patents.

英文关键词： Er:Yb:RAl3(BO3)4; 1.5-1.6 micrometer; 780 nm; self-frequency-doubling; acousto-optic Q-switched pulse