Red Sm:KGd(WO4)2 laser at 649 nm

Amandine Baillard; Pavel Loiko; Daniel Rytz; Sebastian Schwung; Michaël Fromager; Alain Braud; Patrice Camy

doi:10.1364/OL.498100

Red Sm:KGd(WO₄)₂ laser at 649 nm

Opt Lett. 2023 Sep 15;48(18):4721-4724. doi: 10.1364/OL.498100.

Authors

Amandine Baillard, Pavel Loiko, Daniel Rytz, Sebastian Schwung, Michaël Fromager, Alain Braud, Patrice Camy

PMID: 37707886
DOI: 10.1364/OL.498100

Abstract

We report on the first laser operation of a Sm³⁺-doped monoclinic KGd(WO₄)₂ double tungstate crystal in the red spectral range. Pumped by a frequency-doubled optically pumped semiconductor laser (2ω-OPSL) at 479.1 nm, the 0.8 at. % Sm:KGd(WO₄)₂ laser generated an output power up to 17.6 mW at 649.1 nm (the ⁴G_5/2 → ⁶H_9/2 transition) with a slope efficiency of 16.9%, a laser threshold down to 29 mW and a linear polarization. The laser exhibited a self-pulsing behavior, delivering µs-long pulses with a repetition rate of a few kHz. The polarized spectroscopic properties of Sm³⁺ ions were determined as well.