High-performance, digitally power controlled mini-laser welder, specially designed for high precision spot welding of optical modules

Owing to the rapid progress in information technology, requirements for optical modules to be used in optical fiber communication systems are appreciably becoming sophisticated and demanding. To meet the stringent requirement for highly reliable and stable optical modules, we have specially developed a new laser-welder M800C, to realize low-distortion, high precision spot welding of optical modules.Our novel laser cavity, designed to have highly rigid structure and good heat dissipation to alleviate thermal strain, has realized high laser output power stability, less than +/−0.6% of standard deviation value (4.6% peak-to-peak in 14,400 shots) in cyclic environmental temperature test from 5 to 35 degrees Celsius. In addition, we have developed a new laser-pulse-energy-dividing device by utilizing simple polarization dependent beam attenuators based on optical polarization for highly balanced dividing ratio. It can equally divide incident beam into three beams with less than +/−1.0% error for the typical ou...