4.8 mJ pulse energy directly from single-mode Q-switched ytterbium fiber lasers

Using an ytterbium-doped fiber with a 50 μm core and 0.028 NA, a pulse energy of 4.8 mJ was achieved directly from a single-mode Q-switched fiber laser. The repetition rate was 10 kHz and the average power was 48.4 W. The slope efficiencies with regard to the absorbed and launched pump power were ∼7...

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Veröffentlicht in:Optics express 2021-09, Vol.29 (19), p.30384-30391
Hauptverfasser: Kalichevsky-Dong, Monica T., Ge, Wenping, Hawkins, Thomas W., Matniyaz, Turghun, Dong, Liang
Format: Artikel
Sprache:eng
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Zusammenfassung:Using an ytterbium-doped fiber with a 50 μm core and 0.028 NA, a pulse energy of 4.8 mJ was achieved directly from a single-mode Q-switched fiber laser. The repetition rate was 10 kHz and the average power was 48.4 W. The slope efficiencies with regard to the absorbed and launched pump power were ∼74% and ∼59% respectively. The pulse width decreased with increasing pump power. The 4.8 mJ pulse had a FWHM width of ∼300 ns. A shorter pulse of ∼200 ns FWHM was also achieved at 2.06 mJ in another configuration. The M 2 was below 1.3 at all pulse energies. This work demonstrates record pulse energy directly from a single-mode Q-switched fiber laser and the feasibility of operating such a laser with high efficiencies.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.438634