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We present an obstacle in power scaling of thin-disk lasers related withself-driven growth of misalignment due to thermal lens effects. Thisself-driven growth arises from the changes of the optical phase difference atthe disk caused by the excursion of the laser eigen-mode from the optical axis.We found a criterion based on a simplified model of this phenomenon which canbe applied to design laser resonators insensitive to this effect. Moreover, wepropose several resonator architectures which are not affected by this effect.

Thin-disk laser scaling limit due to thermal-lens induced misalignment instability