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The thermal lens effects in Tm:YAP laser are analyzed by solving the Poisson equation with finite difference method.The thermal focal lengths measured are in the range of 40 -90 mm at the pump power of 16 -34 W, consistent with the simulation results.The temperature contribution coefficient (the linear coefficient between the maximum temperature in the laser crystal and the pump power) of 1.19 K/W is also obtained.The convex lens and plano-concave mirror thermal lens compensation methods are proposed and applied to a high power pumped Tm:YAP laser.
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Yao et al. (2010) studied this question.
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