Red, green and infrared three-wavelength lasers generated from LD side-pumped Nd3+:YAG crystal

Monitoring of welding status by molten pool morphology during high-power disk laser welding

“…High power laser beam has excellent beam quality, more homogeneous distribution of temperature, and lead to minimal distortions of specimen when it is applied in hot working and manufacturing [1][2][3]. Welding technology with high-power disk laser beam, as a high quality joining technology, is widely applied in many fields, such as automotive industry and manufacturing [4][5][6].…”

“…The goal of histogram equalization was to transform histogram of these images to be uniform distribution. Different with traditional histogram equalization methods, the range of histogram of the molten pool image was divided into M sections, and in each section the distribution of gray value was not strictly uniform, but they (Marked as T m ) should satisfy Equation(2).…”

Theoretical analysis of the multi-pumped light intensity distribution of laser system with different pumping parameters

“…The thermal effect is the important influence factor of the LD pumped high power solid state lasers, which including the thermal lens effect, the thermally induced stress birefringence effect and the end effect [1]. The thermal lens effect aspects the laser system seriously, such as the system stability, the efficiency, the mode size, the output beam quality, etc.…”