Author, as appears in the article.: Loiko, Pavel; Kifle, Esrom; Guillemot, Lauren; Doualan, Jean-Louis; Starecki, Florent; Braud, Alain; Aguilo, Magdalena; Diaz, Francesc; Petrov, Valentin; Mateos, Xavier; Camy, Patrice;
Department: Química Física i Inorgànica
URV's Author/s: Aguiló Díaz, Magdalena / Díaz González, Francisco Manuel / Mateos Ferré, Xavier
Keywords: Tungsten compounds Tm3+ylf laser Thulium compounds Thulium Spectroscopy Short wave infrared Rare-earth ions Pumping (laser) Power Optical-absorption Operation Multiphonon relaxation Monoclinic klu(wo4)(2) Mid-infrared emission Lutetium compounds Linear laser polarization Infrared radiation High slope efficiency High energy lasers Energy transfer Electron-phonon interactions Electron phonon couplings Efficient energy transfer Crystals Conversion Continuous wave output power Channel wave-guide Absorbed pump power
Abstract: We report on highly efficient and power-scalable laser operation in a thulium-doped high-phonon-energy crystal monoclinic double tungstate, KLu(WO4)(2)] on the H-3(4) -> H-3(5) Tm3+ transition giving rise to the short-wave infrared emission at similar to 2.3 mu m. A 3 at. % Tm-doped crystal generated a maximum continuous-wave output power of 1.12 W at similar to 2.22 and 2.29 mu m with a record-high slope efficiency of 69.2% (versus the absorbed pump power ), a slightly multimode beam (M-x,y(2) = 2.2 and 2.6), and a linear laser polarization. The similar to 2.3 mu m laser outperformed the one operating on the conventional F-3(4) -> H- 3(6) transition (at similar to 1.95 mu m). The effect of the Tm concentration on the similar to 2.3 mu m laser performance indicates a gradually increasing pump quantum efficiency for the H-3(4) upper laser level with the Tm doping. For the 3 at. % Tm-doped crystal, it reached 1.8 +/- 0.1 (almost two-for-one pump process), which is attributed to efficient energy-transfer upconversion. We discuss the physical nature of the laser emissions occurring at intermediate wavelengths between the electronic H-3(4) -> H-3(5) and F-3(4) -> H-3(6) transitions and highlight the role of electron-phonon coupling (vibronic processes) in the appearance of such laser lines. This allowed us to better understand the near- and mid-infrared emission from thulium ions, which can be used in broadly tunable and fs mode-locked 2-2.3 mu m lasers. (C) 2021 Optical Society of America
Thematic Areas: Statistical and nonlinear physics Química Optics Odontología Materiais Interdisciplinar Engenharias iv Engenharias iii Engenharias ii Economia Ciência da computação Biotecnología Biodiversidade Atomic and molecular physics, and optics Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: f.diaz@urv.cat magdalena.aguilo@urv.cat xavier.mateos@urv.cat
Author identifier: 0000-0003-4581-4967 0000-0001-6130-9579 0000-0003-1940-1990
Record's date: 2024-07-27
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.osapublishing.org/josab/abstract.cfm?uri=josab-38-2-482
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Journal Of The Optical Society Of America B-Optical Physics. 38 (2): 482-495
APA: Loiko, Pavel; Kifle, Esrom; Guillemot, Lauren; Doualan, Jean-Louis; Starecki, Florent; Braud, Alain; Aguilo, Magdalena; Diaz, Francesc; Petrov, Valent (2021). Highly efficient 2.3 mu m thulium lasers based on a high-phonon-energy crystal: evidence of vibronic-assisted emissions. Journal Of The Optical Society Of America B-Optical Physics, 38(2), 482-495. DOI: 10.1364/JOSAB.411075
Article's DOI: 10.1364/JOSAB.411075
Entity: Universitat Rovira i Virgili
Journal publication year: 2021
Publication Type: Journal Publications
Repositori URV