Review of thermo-optic effects in gain media of diode pumped lasers is presented. Methods of modelling and compensation of such effects are discussed. Results of characterization of end-pumped lasers by means of energetic and caustics measurement techniques are presented and discussed. Also application of Wigner distribution method for characterization of aberrated laser beams is discussed. Thermally induced astigmatism was observed for the anisotropic rods at high heat load.
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