Journal
JOURNAL OF LUMINESCENCE
Volume 240, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118373
Keywords
Transparent ceramics; Sesquioxides; Erbium ion; Luminescence; Laser operation
Categories
Funding
- Spanish Government, Ministry of Science and Innovation [PID2019-108543RB-I00]
- Generalitat de Catalunya [2017SGR755]
- French Agence Nationale de la Recherche (ANR) [ANR-19-CE08-0028]
- National Natural Science Foundation of China [61805219]
- Key Laboratory of Science and Technology on High Energy Laser, CAEP
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A transparent mixed 7 at.% Er:(Lu,Sc)(2)O-3 sesquioxide ceramic was fabricated by hot isostatic pressing of commercial sesquioxide powders at 1750 degrees C/200 MPa in argon atmosphere. It exhibited excellent optical properties with high signal transmission and high slope efficiency. The study of crystal-field splitting of Er3+ multiplets revealed the significant inhomogeneous broadening of spectral bands in the ceramic material.
A transparent mixed 7 at.% Er:(Lu,Sc)(2)O-3 sesquioxide ceramic was fabricated by hot isostatic pressing of commercial sesquioxide powders at 1750 degrees C/200 MPa in argon atmosphere. It exhibited a cubic bixbyite-type structure (a = 10.198 angstrom), a mean grain size of 5.7 um and high low-signal transmission of 79.1 % in the near- IR. The spectroscopic properties of Er3+ ions were studied. For the I-4(11/2) -> I-4(13/2) transition, the stimulated-emission cross-section sigma(SE) is 1.30 x 10(-20) cm(2) at 2719 nm, the corresponding luminescence branching ratio B (JJ') is 19.9 % and the radiative lifetime of the I-4(11/2) state is 4.80 ms, as determined using a Judd-Ofelt theory accounting for intermediate configuration interaction. The crystal-field splitting of Er3+ multiplets was studied at 12 K. The ceramic exhibits a significant inhomogeneous broadening of spectral bands. An Er:(Lu,Sc)(2)O-3 ceramic laser generated 342 mW at 2.71 and 2.85 mu m with a high slope efficiency of 41.7 % (exceeding the Stokes limit) and a laser threshold of 125 mW.
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