基于侧面热对流的LD泵浦Yb∶KGd(WO_4)_2热透镜效应研究  

Thermal Lensing Effect of Diode-pumped Yb:KGd(WO_4)_2 Based on Convective Heat-transfer on the Side Surface

作　　者：牛荣莲[1] 刘成成[1] 刘莹[1] 刘杰[1] 秦连杰[2] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014 [2]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《光子学报》2011年第1期78-82,共5页Acta Photonica Sinica

基　　金：山东省科技攻关计划基金(No.2010GGX10113);济南市高校自主创新计划基金(No.201004007);山东省自然科学基金(No.Y2008F10)资助

摘　　要：基于对LD端面泵浦Yb∶KGW激光晶体工作特点的分析,建立了符合条件的激光晶体热模型.考虑晶体侧面的热对流,运用MATLAB和FORTRAN软件,通过有限差分法求解各向异性介质热传导方程,得到了该晶体的温度场分布、端面热形变分布和不同泵浦功率下的热焦距.结果表明:在泵浦功率为14 W时,泵浦面最高温度达272.8℃、最大形变为0.48μm,光斑附近的热焦距为4.8 cm.Based on the features of LD end-pumped Yb∶KGW laser crystal,the thermal model was established.Considering the convective heat transfer on the side faces,the temperature distribution,pumped-face distortion and thermal focal length under different pump power were obtained by solving anisotropy heat conductive equation through finite difference method.Under the pump power of 14 W,the highest temperature located at the center of the pumped face is 272.8 ℃,the highest distortion is 0.48 μm,and the thermal lens focal length at the pump spot is 4.8 cm.

关 键 词：固体激光器 Yb∶KGW晶体 有限差分法 热透镜效应 

分 类 号：TN248[电子电信—物理电子学]