Optical EngineeringMinimization of welding-induced alignment distortion in butterfly laser module packages: a study of laser pulse shape
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Laser welding technology is widely used in fiber optic components assembling. A big issue in fiber optic packaging using laser welding is the welding-induced alignment distortion (WIAD), which significantly reduces the fiber optic coupling efficiency. Various studies have been conducted to investigate the factors affecting the WIAD in butterfly laser module packaging, but the influence of laser parameters on the WIAD remains unnoticed. We present a study in minimizing the WIAD by laser pulse shape. Finite element method is employed and a realistic laser-materials interaction model is developed and incorporated into the analysis to investigate the influence of six types of laser pulse shape on the WIAD in the butterfly packages. The results show that the pulse shape significantly affects WIAD. Ideally, a properly selected pulse shape can eliminate or minimize the WIAD in the butterfly laser module packages.