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Proceedings Paper

Recent advances in high-power 2 µm fiber lasers for frequency conversion into the mid-IR
Author(s): Patrick Forster; Clément Romano; Marc Eichhorn; Christelle Kieleck
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Paper Abstract

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.

Paper Details

Date Published: 2 March 2020
PDF: 10 pages
Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 112640H (2 March 2020); doi: 10.1117/12.2545990
Show Author Affiliations
Patrick Forster, Fraunhofer IOSB (Germany)
Karlsruhe Institute of Technology (Germany)
Clément Romano, Fraunhofer IOSB (Germany)
Marc Eichhorn, Fraunhofer IOSB (Germany)
Karlsruhe Institute of Technology (Germany)
Christelle Kieleck, Fraunhofer IOSB (Germany)


Published in SPIE Proceedings Vol. 11264:
Nonlinear Frequency Generation and Conversion: Materials and Devices XIX
Peter G. Schunemann; Kenneth L. Schepler, Editor(s)

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