Growth, structure refinement, thermal expansion and optical spectroscopy of Tm3+-doped MgMoO4

Thulium-doped magnesium molybdate single-crystal (Tm3+:MgMoO4) was grown by the Czochralski method (melting point: 1322 °C). The actual Tm3+ doping level was measured to be 0.1 at.% (the segregation coefficient was only 0.02). Tm:MgMoO4 belongs to the monoclinic class (sp. gr. C2/m, lattice constant...

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Bibliographic Details
Published in:Optical materials 2023-04, Vol.138, p.113648, Article 113648
Main Authors: Subbotin, Kirill, Titov, Anatolii, Lis, Denis, Zimina, Yulia, Didenko, Yana, Elabedine, Ghassen Zin, Eremeev, Kirill, Solé, Rosa Maria, Aguiló, Magdalena, Volkov, Pavel, Popov, Pavel, Chernova, Elena, Díaz, Francesc, Camy, Patrice, Loiko, Pavel, Mateos, Xavier
Format: Article
Language:English
Subjects:
Crystal structure
Czochralski method
Luminescence
Molybdates
Physics
Raman spectra
Thulium ions
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Summary:Thulium-doped magnesium molybdate single-crystal (Tm3+:MgMoO4) was grown by the Czochralski method (melting point: 1322 °C). The actual Tm3+ doping level was measured to be 0.1 at.% (the segregation coefficient was only 0.02). Tm:MgMoO4 belongs to the monoclinic class (sp. gr. C2/m, lattice constants: a = 10.2769(2) Å, b = 9.2898(5) Å, c = 7.0269(4) Å, β = 106.898(6)°). The thermal expansion tensor of this crystal is determined. Its thermal conductivity is also measured at 50–300 K (at room temperature, it amounts to 2.64 Wm−1K−1). Polarized Raman spectra are presented and the strongest mode is found at 957 cm−1. Optical spectroscopy of Tm3+ ions is studied indicating broad emission bands extending beyond 2 μm (the 3F4 → 3H6 transition) and a long lifetime of the 3F4 excited-state (1.972 ms). This makes Tm:MgMoO4 promising for broadly tunable and mode-locked lasers, when the technological problem of fabricating crystals with higher Tm3+ concentrations will be solved. •Czochralski growth of monoclinic thulium-doped magnesium molybdate - Tm3+:MgMoO4.•Rietveld refinement of the crystal structure, thermal exposition tensor determination.•Thermal conductivity is measured at 50–300 K, it is 2.64 Wm−1K−1 at room temperature.•Raman spectra are strongly polarized with the dominant mode at 957 cm−1.•Tm3+ ions exhibit broad emission extending beyond 2 μm and a long 3F4 lifetime.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2023.113648