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In this article, we explore how cryogenic cooling of the Ti:sapphire lasercrystal greatly reduces thermal lensing by over an order of magnitude becauseof two factors: (i) the increase in the thermal conductivity of the crystal,and (ii) the decrease in the temperature dependence of the refractive index. Weobtained analytical expression of the focal length of thermal lens for the pumpinside the laser crystal being a Gaussian beam. Through analysis of the lasercavity stability, we found that in order for the relative difference betweenthe optimal laser cavity path lengths in the horizontal and vertical directionsto be less than 0.1%, the focal length of thermal lens should be longer than0.5 m. Such a requirement can be met if the laser crystal is cooled totemperatures below 100 K while being pumped at a power that is enough toproduce 100 W output. Therefore, it is very likely that an output power of 100W can be achieved on a single Ti:sapphire laser by cryogenic cooling of thelaser crystal.

A study of enhancing the power of a CW Ti:sapphire laser by cryogenic cooling