We report on a thin-disk laser system with more than 10 kW of output power and a beam quality of M 2 = 1.76 at an overall optical-to-optical efficiency of 51%. The system consists of two thin-disk laser oscillators and a thin-disk multi-pass amplifier system. To reach high output powers while maintaining good beam quality, the output beams of two identical laser oscillators are polarization-combined. Subsequently, the beam is amplified in a multi-pass system. To the best of our knowledge, this is the highest output power achieved for a thin-disk laser system with a beam quality close to fundamental mode.

We present a thin-disk multipass amplifier as a power-scaling architecture for ultrafast ps and fs lasers. The system is industrially stable and supports burst functionality. Only minimal CPA is needed.

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