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3.5 kW coherently combined ultrafast fiber laser

: Müller, M.; Klenke, A.; Steinkopff, A.; Tünnermann, A.; Limpert, J.


Optics Letters 43 (2018), No.24, pp.6037-6040
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We present a coherently-combined ultrafast fiber laser system consisting of four amplifier channels delivering 3.5 kW average power at 80 MHz repetition rate with a pulse duration of 430 fs FWHM and a close-to-diffraction-limited beam quality with an M2 < 1.2. The system incorporates a fully automated self-adjustment of the beam combination, allowing for a quasi-turn-key operation of the system. At the date of publication, this system delivers the highest average power reported from an ultrafast laser.