Author, as appears in the article.: Alles, Adrian; Pan, Zhongben; Loiko, Pavel; Serres, Josep Maria; Slimi, Sami; Yingming, Shawuti; Tang, Kaiyang; Wang, Yicheng; Zhao, Yongguang; Dunina, Elena; Kornienko, Alexey; Camy, Patrice; Chen, Weidong; Wang, Li; Griebner, Uwe; Petrov, Valentin; Sole, Rosa Maria; Aguilo, Magdalena; Diaz, Francesc; Mateos, Xavier;

Department: Química Física i Inorgànica

URV's Author/s: Aguiló Díaz, Magdalena / Díaz González, Francisco Manuel / Mateos Ferré, Xavier / Serres Serres, Josep Maria / Solé Cartañà, Rosa Maria

Keywords: Absorption Calcium Charge compensation Crystal-field splitting Crystals Electromagnetic pulse Femtosecond pulse generation Gallium Garnets Generation Growth High thermal conductivity Intensities Intensity parameters Judd-ofelt theory Lithium Lithium metallography Niobium gallium Positive ions Pumping (laser) Random distribution Rare-earth ions Rietveld analysis Spectral broadening Spectroscopy Tantalum Tm3+ Transition probabilities Ultrafast lasers

Abstract: We report on the development of a novel laser crystal with broadband emission properties at similar to 2 mu m - a Tm3+, Li+-codoped calcium tantalum gallium garnet (Tm:CLTGG). The crystal is grown by the Czochralski method. Its structure (cubic, sp. gr . la (3) over bard, a = 12.5158(0) angstrom) is refined by the Rietveld method. Tm:CLTGG exhibits a relatively high thermal conductivity of 4.33 Wm(-1) K-1. Raman spectroscopy confirms a weak concentration of vacancies due to the charge compensation provided by Li+ codoping. The transition probabilities of Tm3+ ions are determined using the modified Judd-Ofelt theory yielding the intensity parameters Omega(2) = 5.185, Omega(4) = 0.650, Omega(6) = 1.068 [10(-20) cm(2)] and alpha = 0.171 [10(-4) cm]. The crystal-field splitting of the Tm3+ multiplets is revealed at 10 K. The first diode-pumped Tm:CLTGG laser generates 1.08 W at similar to 2 mu m with a slope efficiency of 23.8%. The Tm3+ ions in CLTGG exhibit significant inhomogeneous spectral broadening due to the structure disorder (a random distribution of Ta5+ and Ga3+ cations over octahedral and tetrahedral lattice sites) leading to smooth and broad gain profiles (bandwidth: 130 nm) extending well above 2 mu m and rendering Tm:CLTGG suitable for femtosecond pulse generation. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Thematic Areas: Astronomia / física Biotecnología Electronic, optical and magnetic materials Engenharias ii Engenharias iii Engenharias iv Interdisciplinar Materiais Materials science, multidisciplinary Optics Química

licence for use: https://creativecommons.org/licenses/by/3.0/es/

Author's mail: magdalena.aguilo@urv.cat rosam.sole@urv.cat xavier.mateos@urv.cat f.diaz@urv.cat josepmaria.serres@urv.cat josepmaria.serres@urv.cat

Author identifier: 0000-0001-6130-9579 0000-0002-5769-4141 0000-0003-1940-1990 0000-0003-4581-4967 0000-0002-4299-538X 0000-0002-4299-538X

Record's date: 2023-05-14

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://opg.optica.org/ome/fulltext.cfm?uri=ome-11-9-2938&id=456093

Papper original source: Optical Materials Express. 11 (9): 2938-2951

APA: Alles, Adrian; Pan, Zhongben; Loiko, Pavel; Serres, Josep Maria; Slimi, Sami; Yingming, Shawuti; Tang, Kaiyang; Wang, Yicheng; Zhao, Yongguang; Dunina (2021). Tm3+-doped calcium lithium tantalum gallium garnet (Tm:CLTGG): novel laser crystal. Optical Materials Express, 11(9), 2938-2951. DOI: 10.1364/OME.435238

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Article's DOI: 10.1364/OME.435238

Entity: Universitat Rovira i Virgili

Journal publication year: 2021

Publication Type: Journal Publications