Post-weld-shift in dual-in-line laser package

The post-weld shift (PWS) effect in laser welding for a dual-in-line packag e (DIP) with fiber pigtail to semiconductor laser connection has been studi ed experimentally and numerically, Experimental results show that the PWS o f an optical component welded by a dual-beam laser system deforms and the w elded component rotates counterclockwise as the difference of the energies between two laser beams increases. This indicates that the PWS in laser pac kaging can be minimized by properly controlling the laser beam-to-beam ener gy balance. A thermal-plasticity coupled finite-element model (FEM) has bee n also carried out on the analysis of the effect of PWS in laser packaging. Numerical results show that a PWS in the DIP may be introduced from an unb alanced distribution of residual stresses introduced from the solidificatio n shrinkage. A satisfactory agreement between the experimental results and FEM calculations suggests that the FEM may provide an effective method for predicting the PWS in laser welding technique for optoelectronic packaging.