Simulation and Experimental Study of Laser Hammering for Laser Diode Packaging

Abstract

Laser hammering is a key and effective technique to correct the post-weld-shift in laser welding process. In order to obtain a detailed understanding of the shrinkage deformation principle and magnitude induced by laser Hammering, a finite-element-method (FEM) is employed to analyze the welding shift for the TO-CAN style laser diode package. Detailed relations between welding shift and the beam energy pulse width are obtained. A welding shift measurement system with two noncontact capacitive displacement sensors with high accuracy and high resolution is established. The measurement system can determine the shift direction or deformation angle in real time. The experiment results of this paper will be helpful for the selection of laser beam parameters in the laser hammering process to achieve fast and accurate shift correction.Index Terms-Laser diode, laser hammering, laser welding, package, post-weld-shift (PWS).

New packaging concepts for highly stable laser diode modules

“…This method is well established for telecommunication products [1], [2]. Even the welding-induced alignment distortion of the optics is well understood and can be corrected very precise and efficiently with the same equipment [3], [4].…”

Defect Detection for Metal Base of TO-Can Packaged Laser Diode Based on Improved YOLO Algorithm

“…Laser diode (LD), also known as a semiconductor laser, is widely used in the field of optical communication. As the most common means of the coaxial package in the LD industry, the TO-can package has been wildly used in the field of low-power laser packages [1][2][3]. As shown in Figure 1, the metal base is an important part of a TO-can, used to connect pins and luminous semiconductors.…”

Laser forming for sub-micron adjustment: with application to optical fiber assembly

“…An application of laser forming that received substantial attention in the recent years, is the high precision alignment and assembly of (small) components. This process is often referred to as 'laser adjusting' [10] or 'laser hammering' [26,27]. This process has been applied to several industrial applications where a sub-micron assembly accuracy was required [18,[27][28][29][30].…”