Abstract
Analytical and numerical studies of the thermal characteristics of conventional and composite laser rods in laser-diode endpumped geometry are reported in detail using Nd : YAG rods as an example. It has been shown that taking into account the temperature dependence of the heat conductivity, the change of the temperature in the active element can be signicantly higher compared to the data for the temperature-independent heat conductivity coefcient. It has been found that the dependence of heat conductivity on temperature causes the non-parabolic heat distribution even in the region inside the pump beam with the top hat intensity distribution. It has also been shown by direct numerical simulations that the undoped entrance section of the composite rod signicantly reduces the peak temperature rise inside the crystal.
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