Growth, Structure, Spectroscopy and Laser Operation of a “mixed” Yb:(Y, Lu)3Al5O12 Garnet Crystal

Slimi, S.; Loiko, P.; Pan, M.; Lehoux, P.; Jambunathan, V.; Smrz, M.; Mocek, T.; Wang, Y.; Chen, W.; Petrov, V.; Solé, R.M.; Aguiló, M.; Díaz, F.; Camy, P.; Mateos, X. Growth, Structure, Spectroscopy, and Laser Operation of a “Mixed” Yb:(Y,Lu)₃Al₅O₁₂ Garnet Crystal. Crystals 2023, 13, 1588. Slimi, S.; Loiko, P.; Pan, M.; Lehoux, P.; Jambunathan, V.; Smrz, M.; Mocek, T.; Wang, Y.; Chen, W.; Petrov, V.; Solé, R.M.; Aguiló, M.; Díaz, F.; Camy, P.; Mateos, X. Growth, Structure, Spectroscopy, and Laser Operation of a “Mixed” Yb:(Y,Lu)3Al5O12 Garnet Crystal. Crystals 2023, 13, 1588.

Abstract

A single-crystal of ytterbium-doped “mixed” yttrium-lutetium aluminium garnet with a stoichiometric composition of (Y0.601Lu0.233Yb0.166)3Al5O12 was grown by the Czochralski method and its structure, vibronic, spectroscopic and laser properties were studied. The stimulated-emission cross-section for Yb3+ ions was maximized to 2.53×10-20 cm2 at 1031 nm, the emission bandwidth is ~8 nm and the reabsorption-free luminescence lifetime of the 2F5/2 state is 1.063 ms. Pumped at 941 nm, the Yb-laser generated a maximum output power of 1.04 W at 1.03 and 1.05 μm with a high slope efficiency of 76.4% and a laser threshold of 76 mW. A continuous wavelength tuning over a range of 51.6 nm (1026.4 - 1078.0 nm) was also achieved. Power scaling is achieved using a 969 nm-diode pumped microchip cavity. A maximum output power of ~9 W is obtained at 1.05 μm with a slope efficiency of 76% and with an almost circular laser beam profile.

Keywords

Garnet crystals; Ytterbium ion; Crystal structure; Optical spectroscopy; Solid-state lasers

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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