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

Patrick Forster; Clément Romano; Marc Eichhorn; Christelle Kieleck

doi:10.1117/12.2545990

2 March 2020 Recent advances in high-power 2 µm fiber lasers for frequency conversion into the mid-IR

Patrick Forster, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX; 112640H (2020) https://doi.org/10.1117/12.2545990
Event: SPIE LASE, 2020, San Francisco, California, United States

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.

Citation Download Citation

Patrick Forster, Clément Romano, Marc Eichhorn, and Christelle Kieleck "Recent advances in high-power 2 µm fiber lasers for frequency conversion into the mid-IR", Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 112640H (2 March 2020); https://doi.org/10.1117/12.2545990

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