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4-channel coherently combined long-term-stable ultrafast thulium-doped fiber CPA

: Gaida, C.; Stutzki, F.; Gebhardt, M.; Heuermann, T.; Breitkopf, S.; Eidam, T.; Rothhardt, J.; Limpert, J.


Optical Society of America -OSA-, Washington/D.C.:
Advanced Solid State Lasers, ASSL 2020 : Part of Laser Congress : 13-16 October 2020, Washington, D.C., United States
Washington, D.C.: OSA, 2020
ISBN: 978-1-943580-84-2
Paper AW5A.1
Advanced Solid State Lasers Conference (ASSL) <2020, Online>
Laser Congress <2020, Online>
Conference Paper
Fraunhofer IOF ()

We present the first coherently combined, thulium-doped fiber CPA delivering >100 W average-power and simultaneously >1 GW of peak-power. Incorporating four amplifier channels the laser delivers pulses with >228 µJ energy and <120 fs duration at 1940 nm center wavelength. Excellent long-term stability is achieved with an average power fluctuation of <0.5% RMS over >48 hours - ideal prerequisites for next-generation industrial and scientific applications.