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Recent advances in high-power 2 µm fiber lasers for frequency conversion into the mid-IR

: Forster, Patrick; Romano, Clément; Eichhorn, Marc; Kieleck, Christelle


Schunemann, P.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion: Materials and Devices XIX : 3-5 February 2020, San Francisco, California
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11264)
ISBN: 978-1-5106-3291-2
ISBN: 978-1-5106-3292-9
Paper 112640H, 10 pp.
Conference "Nonlinear Frequency Generation and Conversion - Materials and Devices" <19, 2020, San Francisco/Calif.>
Conference Paper
Fraunhofer IOSB ()
Triple-Clad; polarization-maintaining; fiber laser; Thulium

We report on the first polarization-maintaining (PM) Thulium (Tm3+):Holmium (Ho3+)-codoped triple-clad fiber (THTF) laser. First fundamental studies were done in a CW regime and showed highly promising results as a high power pump source for frequency conversion in ZGP crystals. For an unpolarized output, the fiber laser delivered up to 145 W. Switching to a polarized operation, up to 140 W of optical output power with a slope efficiency of 36.3 %, an optical-to-optical efficiency of 32 %, and a beam propagation factor of M2 x,y < 1:9 was obtained with a degree of polarization > 99:8 %. The laser output wavelength was tunable from 2022 nm to 2068 nm. Operating in Q-switched regime at a repetition rate of 140 kHz, the pulses of the THTF laser had a pulse width of 96 ns, a pulse energy of 275 µJ, and a peak power of 2.84 kW. The emission spectrum was centered at ~2050 nm with a linewidth of 60 pm.