Post-weld-shift in semiconductor laser packaging

Post-weld-shift (PWS) in laser welding technique for a package (DIP) with fiber pigtail to laser connection has been studied experimentally and numerically modelled. Experimental results show that the PWS of optical component welded by a dual-beam laser welding system shifts more to the counterclockwise as the energy difference of the laser beam increases. This indicates that the PWS in laser packaging can be minimized by properly controlling the laser beam energy delivery. A finite-element method (FEM) has been carried out to analyse the effect of laser beam energy variation on PWS in laser packaging. A satisfactory agreement between the experimental results and FEM calculations suggests that the FEM provides one of the effective methods for predicting the PWS in laser welding technique for optoelectronic packaging