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10.4 kW coherently combined ultrafast fiber laser

: Müller, M.; Aleshire, C.; Klenke, A.; Haddad, E.; Legare, F.; Tünnermann, A.; Limpert, J.

Fulltext ()

Optics Letters 45 (2020), No.11, pp.3083-3086
ISSN: 0146-9592
Journal Article, Electronic Publication
Fraunhofer IOF ()

An ultrafast laser delivering 10.4 kW average output power based on a coherent combination of 12 step-index fiber amplifiers is presented. The system emits close-to-transform-limited 254 fs pulses at an 80 MHz repetition rate, and has a high beam quality (M2≤1.2) and a low relative intensity noise of 0.56% in the frequency range of 1 Hz to 1 MHz. Automated spatiotemporal alignment allows for hands-off operation.