低温下运行的光纤耦合激光二极管抽运Tm,Ho∶YLF激光器  

High Efficient CW Tm,Ho∶YLF Laser Pumped by Fiber-Coupled Diodes

作　　者：姚宝权[1] 王月珠[1] 贺万骏[1] 李玉峰[1] 鞠有伦[1] 

机构地区：[1]哈尔滨工业大学可调谐激光国家级重点实验室,黑龙江哈尔滨150001

出　　处：《中国激光》2005年第7期881-884,共4页Chinese Journal of Lasers

基　　金：哈尔滨工业大学校基金(HIT-2002-14)资助项目。

摘　　要：为了实现小型化、高功率、高效率连续2μm激光输出,采用中心波长792nm激光二极管(LD)抽运双掺杂Tm,Ho∶YLF晶体,将晶体封装在装有350mL液氮的杜瓦装置中,使其工作在77K温度条件下。光纤耦合激光二极管出纤功率14.8W,数值孔径0.3,芯径400μm。激光二极管端面抽运Tm,Ho∶YLF激光器,产生2.05μm线偏振连续激光输出,最大功率5.2W。由于Tm3+离子能级间的交叉弛豫效应导致的高抽运量子效率,实验获得的光-光转换效率为35%,斜度效率达到40%。采用双端面抽运结构,两个激光二极管注入功率29.6W时,Tm,Ho∶YLF激光器输出功率达10.2W,相当于光-光转换效率33%,斜度效率36%。In this paper, a high power of cryogenic Tm(8 at.-%), Ho(1.4 at.-%):YLF end-pumped by a fiber-coupled laser diode (LD) with numerical aperture of 0.3, core diameter of 0.4 mm, and central wavelength of 792 nm at 20°C temperature is reported. The highest continuous-wave (CW) power of 5.2 W at 2.05 μm is achieved under pump power of 14.8 W, corresponding to optical-optical conversion efficiency of 35%, and the slope efficiency is greater than 40%. The threshold power is only about 0.48 W because of the long lifetime, large effective emission cross section, and low reabsorption loss in Tm,Ho:YLF crystal. Under pumping power of 29.6 W with dual-end pumping configuration, the highest CW power of 10.2 W at 2.051 μm is attained, corresponding to optical-optical conversion efficiency of 33%, and the slope efficiency is greater than 36%.

关 键 词：激光技术 固体激光器 激光二极管抽运 光纤耦合 Tm Ho:YLF激光器 低温 

分 类 号：TN248.1[电子电信—物理电子学]