激光二极管纵向抽运(Tm,Ho)∶YLF激光器的研究  

Study of Laser Diode End-Pumped (Tm,Ho)∶YLF Laser

作　　者：张新陆 王月珠[1] 姚宝权[1] 董力强[1] 

机构地区：[1]哈尔滨工业大学光电技术研究所可调谐激光国家重点实验室

出　　处：《光学学报》2004年第1期88-93,共6页Acta Optica Sinica

摘　　要：对激光二极管端面抽运 (Tm ,Ho)∶YLF固体激光器的激光特性进行了研究。根据激光二极管抽运准三能级系统的特性 ,详尽地分析了能量在Tm3 + 离子和Ho3 + 离子之间的传递过程 ,给出了 (Tm ,Ho)∶YLF激光器准三能级的速率方程 ,对上转换及激光下能级粒子再吸收对激光二极管抽运 (Tm ,Ho)∶YLF激光器运转的影响进行了理论分析 ,得出了 (Tm ,Ho)∶YLF激光器的阈值抽运功率和斜率效率的解析表达式。同时对 (Tm ,Ho)∶YLF微片激光器的激光特性进行了实验研究 ,当保持晶体温度为 19℃时 ,阈值抽运功率为 4 2 5mW ,斜率效率为 2 2 .5 % ,最大光光转换效率为 17.4 % ,并且在将晶体保持在四个不同的温度下 ,给出了激光输出功率随抽运功率变化的实验结果。将理论与实验结果进行比较 ,发现吻合得比较好。The laser properties of laser diode end-pumped (Tm,Ho)∶YLF laser are studied. Based the characteristics of laser diode pumped quasi-three-level system,the energy transfer between Tm 3+ and Ho 3+ is discussed and the rate equations of (Tm,Ho)∶YLF laser are given. The influences of up-coversion effect and reabsorption loss on operation of laser diode pumped (Tm,Ho)∶YLF laser are analyzed theoretically,and the analytical expressions of threshold pump power and slope efficiency are gotten. At the same time,the experiment of (Tm,Ho)∶YLF microchip laser is conducted,when thre crystal is kept at 19 ℃,the threshold pump power is 425 mW,the slope efficiency is 22.5%,the maximum optical-to-optical efficiency is 17.4%, and the relation between the input power and the output power at four different temperature is obtained. The experimental results are in good agreement with theoretical results.

关 键 词：激光二极管抽运 YLF激光器 铥离子 钬离子 上转换效应 阈值抽运功率 斜率效率 转换效率 

分 类 号：TN248.1[电子电信—物理电子学]