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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 M2 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 laser with high efficiencies.
Monica T. Kalichevsky-Dong,Wenping Ge,Thomas W. Hawkins,Turghun Matniyaz, andLiang Dong
"4.8mJ pulse energy directly from a single-mode Q-switched ytterbium fiber lasers", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 1198107 (4 March 2022); https://doi.org/10.1117/12.2606254
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Monica T. Kalichevsky-Dong, Wenping Ge, Thomas W. Hawkins, Turghun Matniyaz, Liang Dong, "4.8mJ pulse energy directly from a single-mode Q-switched ytterbium fiber lasers," Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 1198107 (4 March 2022); https://doi.org/10.1117/12.2606254