中文摘要：

建立了晶体管外形罐（TO-can,transistor outline-can）型LD激光焊接封装的三维有限元模型,利用热-结构耦合分析方法,对焊后位移（PWS）进行数值模拟。分析结果表明：焊点位置对称时,其能量差别越大,PWS越大,PWS朝向能量合成的方向;3个焊点的位置不对称引起的PWS较小,主要是轴向位移。PWS特征的理论分析得到了实验结果的证实,因此有限元方法可以有效预测PWS。

英文摘要：

The post-weld-shift（PWS） is a serous issue in opto-electronic fiber pigtail package using laser welding, which resuits in coupling power loss and significantly affects the packaging yield. A 3-D finite element model of a TO-Can laser diode package has been developed and the PWS has been numerically modeled with thermal-structural coupling. The resutls demonstrate that the PWS is increased when the energy difference among the three weld spots are enlarged. The PWS is along the complex direction of the three weld spots. The PWS with unsymmetry welding is less than the PWS with unbalanced energy welding,and the PWS is mainly occurred in z axis when the three weld spots are not symmetric. The theoretic analysis is well confirmed by the experiments. So the finic-element method can be used to effectively predic the PWS.