<title>High-average-power solid state lasers with a self-adaptive cavity based on a nonlinear mirror</title>

A high average power laser oscillator with a cavity completed by a nonlinear mirror formed by refractive index gratings which accompany population gratings induced in Nd:YAG laser crystals by generating beams themselves is investigated experimentally. The spatio-temporal self- adaptation of the cavity formed by nonlinear dynamic mirrors is studied. The generation of beams with average power up to 250W, near-diffraction-limited divergence and long coherence length is demonstrated.

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