Abstract
This paper has established a thermal model of Vertical-external-cavity surface-emitting semiconductor laser (VECSELs)
with water-cooled heatsink, calculated the distribution of temperature field with finite element method, and studied the
effects of pumping light, heat transfer coefficient, and heatsink characteristics on the maximum temperature of the
quantum well. Calculations show that there is an optimal heat transfer coefficient value interval, thermal conductivity of
the VECSELs heatsink will have a significant impact on the maximum temperature of the quantum well, and increasing
area of cooler heatsink would help to improve heat dissipation performance. It also shows that the maximum temperature
of the quantum well has a linear relationship with pump power, and a nearly inverse relationship with the spot size. Due
to thermal diffusion of water-cooled heatsink for VECSELs point heat source, the maximum temperature of quantum
well is not sensitive to thickness and area of the heatsink, heat dissipation performance which uses a diamond heatsink is
about 1.7 times the oxygen-free copper heatsink.
