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The first direct measurements of thermally induced lensing in end-pumped Cr 3+ -doped LiSAF, LiSGAF, LiSCAF, and LiCAF are reported. Using a sensitive measurement technique, focal lengths as long as 40 m were measured. A thermal model has been created to determine the temperature rise as a function of position inside the laser crystal. This new model calculates the temperature distribution by considering quantum defect, upconversion, and upper state lifetime quenching as heating sources.doi:10.1109/3.668779 fatcat:r4wkkocuhbfx5ccxvaop3v4b7i