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High-average-power femtosecond laser at 258 nm

We present an ultrafast fiber laser system delivering 4.6 W average power at 258 nm based on two-stage fourth-harmonic generation in beta barium borate (BBO). The beam quality is close to diffraction limited with an M2- value of 1.3 x 1.6. The pulse duration is 150 fs, which potentially is compressible down to 40 fs. A plain BBO and a Sapphire-BBO compound are compared with respect to the achievable beam quality in the conversion process. This laser is applicable in scientific and industrial fields. Further scaling to higher average power is discussed

preprint2021arXivOpen access
Michael MüllerArno KlenkeThomas GottschallRobert KlasCarolin RothhardtStefan DemmlerJan RothhardtJens LimpertAndreas Tünnermann
physics.optics
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Michael MüllerArno KlenkeThomas GottschallRobert KlasCarolin RothhardtStefan DemmlerJan RothhardtJens LimpertAndreas Tünnermann

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