Numerical simulation of medium temperature and stress for high power disk laser

This paper presents the numerical simulation of the Nd:YAG disk as the high power laser medium. The upper surface of the disk is pumped by the diode array, and the other side is cooled by copper heat sink. Temperature and stress are simulated for the disk partly pumped by an area of 7.5 mm×6.2 mm as well as pumped from its whole surface .The results show that with the same pumping power intensity, environment temperature and cooling, the overall stress of the disk fully pumped is smaller than that of the partly pumped disk. As the former is mainly caused by the difference of thermal expansion between the disk and the copper heatsink,it reduces when the compound diamond is used as a medium. While the latter, which is mainly caused by the temperature difference between the pumped and non-pu