TY - JOUR
TI - Thermal and stress analysis in Nd: YAG laser rod with different double end pumping methods
AU - Shibib Khalid S
AU - Minshid Mohammed A
AU - Alattar Nebras E
JN - Thermal Science
PY - 2011
VL - 15
IS - 12
SP - 399
EP - 407
PT - Article
AB - In this work, the finite element analysis has been used to predict the  temperature distribution in Nd: YAG laser rod; double end-pumped by two  methods Gaussian or top hat beam. The rod is cooled by water passing through  annular, which surrounds the active media. The temperature distribution has  been used to predict numerically, the nodal displacements, strain and stress  based on the principle of virtual work. The main task is to determine the  temperature distribution in Nd: YAG laser rod, the subsequent value and  location of maximum tensile hoop stress associated with the two types of the  double end pumping for different absorption power. Some conclusions are  obtained; as the radius pumping ratio increases the location of maximum hoop  stress will move toward the periphery and vice-versa. Small reduction is  observed in the location of maximum hoop stress when pumping method change  from the top-hat beam to Gaussian beam, especially at low radius pumping  ratio and high absorption power. Top hat beam end pumping will cause more  intense tension hoop stress at the facets of the rod than that of Gaussian  beam even the later may produce high center temperature. This work may be  important for designer while choosing the type of pumping, maximum produced  tensile hoop stress and its location, especially when hoop stress is  ultimate.