激光二极管端面泵浦Yb∶YAG薄片激光器的热效应  

Thermal Effect of Yb∶YAG Slice Laser by Diode Laser End-pumped

作　　者：甘安生[1] 李隆[1] 史彭[1] 

机构地区：[1]西安建筑科技大学理学院应用物理所,西安710055

出　　处：《光子学报》2008年第4期631-635,共5页Acta Photonica Sinica

基　　金：陕西省教育厅专项科研基金(07JK284);西安建筑科技大学基础基金(JC0619);人才基金(RC0608)资助

摘　　要：通过激光二极管端面泵浦Yb∶YAG薄片工作特点分析,建立了符合实际情况的热模型.热模型考虑了介质薄片具有端面绝热、周边恒温冷却、后端面镀膜达到充分利用泵浦光能量等特点.分析并建构了Poisson方程新的求解方法,得出了Yb∶YAG薄片内部温度场以及泵浦端面热形变场的一般解析表达式.理论研究结果表明:若激光二极管泵浦功率为20W、耦合到薄片泵浦面的泵浦光高斯半径为250μm时,长度3mm、半径1.5mm的5.0at.%Yd:YAG薄片泵浦端面的最高温升为44.5℃,最大热形变量为0.83μm.By the analysis of working characteristic of Yb ： YAG slice with diode laser end-pumped, a thermal model that matched practical situation was introduced. In the thermal model, some characteristics of the Yb： YAG slice were considered, such as thermal insulation of end-faces, a constant cooling temperature around the side-face and the high reflective film on the rear surface of the slice to better absorb the pumped-power. A novel solution of the Possion equation was analyzed and established. A general solutions of temperature field and thermal distortion field of Yb ： YAG slice were obtained. The theoretical result shows that when the pumped-power of diode laser is 20 W and the Gaussian radius coupled on the pumped-face of the slice is 0. 25 /μm, the maximal temperature raise of Yb ： YAG slice, which the length and the radius of Yb ： YAG slice is 3 mm and 1.5 mm and the ytterbium doped concentration in Yb ： YAG slice is 5 % ,is 44.5℃ ,and thermal distortion on pump-face is 0.83 μm. These results can offer theoretical basis in the design of stable all-solid-state Yb ： YAG laser.

关 键 词：YB:YAG激光器 端面泵浦 热效应 解析分析 

分 类 号：TN248.1[电子电信—物理电子学]