Theoretical and experimental study on post-weld-shift of coaxial laser diodes

In order to study laser welding post-weld-shift (PWS) of coaxial laser diodes based on finite element thermal theory and structural coupling theory, 3 beams laser welding model of coaxial laser diode was developed. Parameters affecting PWS were analyzed and meanwhile, correction experiment of laser hammer was studied. Coupling optical power value was obtained before and after laser welding and after correction. The simulation results demonstrate that power distribution and position distribution of three weld spots have influence on PWS of laser welding of coaxial laser diodes. Coupling light power is on the rise after laser hammering correction, and the maximum coupling power can be up to 94%. Finite element method can be used to prove the reasonable predict of PWS direction. The results have a certain guiding significance on production of coaxial laser in laser welding.