High-average-power femtosecond laser at 258  nm.

Abstract

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 being diffraction limited with an M<sup>2</sup> value of 1.3×1.6. The pulse duration is 150 fs, which, potentially, is compressible down to 40 fs. A plain BBO and a… (More)
DOI: 10.1364/OL.42.002826

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