钛宝石端面泵浦Yb^3＋：YAG激光器输出功率的理论分析  

Theoretical Analysis of Yb^(3+):YAG Laser End-pumped by Ti:Sapphire

作　　者：张智群[1] 黄志云[1] 邱怡申[1] 李高明[1] 

机构地区：[1]福建师范大学激光与光电子技术研究所、福建省光子技术重点实验室、医学光电科学与技术教育部重点实验室,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2009年第2期44-49,共6页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省科技厅基金资助项目(2007F505010041)

摘　　要：从准三能级速率方程出发,模拟分析了940 nm钛宝石激光端面泵浦Y b3+:YAG输出1 030 nm激光的性能.在此过程中,着重考虑了泵浦光的吸收饱和以及Y b3+的自吸收损耗.结果表明:由于输出波长在1 030 nm附近的Y b3+:YAG晶体存在严重的自吸收损耗,入射功率必须足够强时才能有激光输出,因此激光器的阈值较高;同时,自吸收损耗与Y b3+离子浓度、晶体厚度有关,存在最佳的晶体厚度和Y b3+离子浓度,使激光器的输出功率最大.泵浦光的吸收饱和使激光器运转时激光下能级的粒子数减少,吸收系数下降,相同入射泵浦功率时,激光器的输出功率较低.The 1 030 nm output power of Yb3＋. YAG laser end-pumped by 940 nm Ti. sapphire laser is studied theoretically, where the model is developed based on the quasithree-level rate equation. In the derived model, the pump absorption saturation and re-absorption of Yb^3＋ ion are taken into account. The results show that, due to the significant reabsorption of Yb^3＋ ion in the lower laser level, it results in the high pump threshold. The loss resulted from re-absorption is affected by the medium length and the active ion concentration, and it implies there is an optimal combination of the length and the concentration maximizing the output laser power. For pump absorption saturation, it reduces the population of the lower pump level and so the absorption coefficient. Therefore, for the given pump power, the output power may be lower if the pump absorption saturation is taken into account.

关 键 词：激光器 钛宝石激光 端面泵浦 Yb3+:YAG晶体 

分 类 号：O436[机械工程—光学工程]