High laser power can cause thermal stresses on the optical lens that is positioned in the cutters head. Due to the x-y-z movement of the head, a small, lightweight and high-power cooling solution was required to retain the laser specifications.
Cryogenic high-power cooling is implement to retain the cutters head within acceptable thermal boundaries. Because of the high-temperature gradient, a lot of power could be transported within a relatively small surface area. The thermal design is made using fast dynamic LEM methods. The final design is analyzed and performance is validated using extensive numerical methods (FEM).
A thermal layout was made of the cryogenic cooling system which consisted of a open cryogen-loop system using liquid nitrogen. This layout was optimized for the required LN2 mass flow and optimal thermal interfacing.