Open Access4.8 mJ pulse energy directly from single-mode Q-switched ytterbium fiber lasers
Author(s) -
Monica T. Kalichevsky-Dong,
Wenping Ge,
Thomas Hawkins,
Turghun Matniyaz,
Liang Dong
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.438634
Subject(s) - fiber laser , optics , materials science , ytterbium , laser , full width at half maximum , q switching , pulse (music) , pulse width modulation , pulse duration , optoelectronics , power (physics) , physics , quantum mechanics , detector
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.