188 W average power coherently combined Tm-doped fiber laser system delivering ultrashort pulses with 1.86 mJ energy

Tobias Heuermann; Ziyao Wang; Mathias Lenski; Martin Gebhardt; Christian Gaida; Mahmoud Abdelaal; Joachim Buldt; Michael Müller; Arno Klenke; Jens Limpert

doi:10.1117/12.2650327

8 March 2023 188 W average power coherently combined Tm-doped fiber laser system delivering ultrashort pulses with 1.86 mJ energy

Tobias Heuermann, Ziyao Wang, Mathias Lenski, Martin Gebhardt, Christian Gaida, Mahmoud Abdelaal, Joachim Buldt, Michael Müller, Arno Klenke, Jens Limpert

Author Affiliations +

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000E (2023) https://doi.org/10.1117/12.2650327
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

We report on our results of the coherent combination of four Tm-doped rod-type fiber amplifiers. The chirped pulse amplification system emits an average output power of 188 W and a pulse energy of 1.86 mJ at 100.86 kHz repetition rate. The compressed pulses were measured via second order frequency optical gating. The retrieval reveals a compressed pulse duration of the laser system of 84 fs resulting in peak power of 17.7 GW. The amplifier interferometer was stabilized using locking of coherence by single-detector electronic frequency-tagging and piezo driven mirrors in front of the amplifier channels. The long term stability of the source was tracked with a thermal power sensor over a duration of 120 minutes and shows a stability of <0.1 % rms over this measurement period. To the best of our knowledge, this is the highest average power ultrafast mJ-class short-wavelength infrared laser to date. This proves the applicability of coherent combining techniques in Tm-doped fiber laser systems, opening the route towards performance scaling of ultrafast SWIR laser sources to kW-class average power levels with multi-mJ energies. Additionally this renders this technology the ideal candidate for frequency conversion into the soft X-ray, mid infrared and THz spectral region.

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Tobias Heuermann, Ziyao Wang, Mathias Lenski, Martin Gebhardt, Christian Gaida, Mahmoud Abdelaal, Joachim Buldt, Michael Müller, Arno Klenke, and Jens Limpert "188 W average power coherently combined Tm-doped fiber laser system delivering ultrashort pulses with 1.86 mJ energy", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000E (8 March 2023); https://doi.org/10.1117/12.2650327

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