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Thermal and stress analyses in an end-pumped Nd:YAG slab laser using finite element method
Mina Babaei Bavil,Ebrahim Safari 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
The increasing application on high laser power in industries required studies in the portion of pump radiation absorbed by laser mediathat exchanges to heat. Heat may cause thermal stress, stress birefringence and thermal lens effects. These effects can destroy the opticalproperties of the laser medium, decrease the beam quality and may lead to medium break. In this paper, the thermal and stress analyses ofcontinuous and pulsed end-pumped Nd:YAG slab laser are studied using finite element method. Heat deposited in the slab is removed bycooling water, flowing on the largest faces of the slab, which surrounds the active media. The temperature and stress distributions of theend-pumped Nd:YAG slab are defined by coupled field methods in the ANSYS commercial finite element software. The value of maximumtemperature and stress in the slab which is affected by an end-pumping are calculated. Finally the maximum pump-power rangewhich can be applied to the slab is determined using the limit of maximum stress in the slab. The analyses are done in from transient tosteady-state regimes for continuous pumping. Results show that deposited heat due to the pulsed pumping acts like a mechanical impact.