Haqi I Qatta
Articles written in Pramana – Journal of Physics
Volume 79 Issue 2 August 2012 pp 287-297
A time-dependent analytical thermal model of the temperature and the corresponding induced thermal stresses in continuous wave double-end-pumped laser rod are derived from the ﬁrst principle using the integral transform method. The aim of the paper is to study the effect of increasing the pumping powers while the laser crystals are still in the safe zone (i.e. far away from failure stress) and to suitably choose a crystal that achieves this task. The result of this work is compared with a well-veriﬁed ﬁnite element solution and a good agreement has been found. Some conclusions are obtained: Tm:YAP crystal, which has high thermal conductivity, low expansion coefﬁcient, low absorption coefﬁcient, low thermal factor and low product of $\gamma E/(1−\nu)$, is the best choice to reduce induced stress although it is responded and brought to thermal equilibrium faster than the other types of crystal usually used in the end-pumped solid-state laser.
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