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Spectroscopy of tetragonal Eu:NaGd(WO4)2 crystal

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Authors
Loiko, P. A.
Vilejshikova, E. V.
Mateos, X.
Serres, J. M.
Dashkevich, V. I.
Orlovich, V. A.
Yasukevich, A. S.
Kuleshov, N. V.
Yumashev, K. V.
Grigoriev, S. V.
Vatnik, S. M.
Bagaev, S. N.
Pavlyuk, A. A.
Date
2016
Bibliographic entry
Spectroscopy of tetragonal Eu:NaGd(WO4)2 crystal / P. A. Loiko [et al.] // Optical Materials. – 2016. – Vol. 57. – P. 1-7.
Abstract
We report on growth and detailed spectroscopic study of Eu3ю-doped tetragonal sodium gadolinium double tungstate, Eu:NaGd(WO4)2, a new promising crystal for deep-red lasers. Large-volume crystal doped with 4.9 at.% Eu is grown by Czochralski method along the [001] crystallographic direction. Absorption of Eu3ю ions is studied at room temperature (RT) and at 6 K. For the absorption band related to the 7F1 / 5D1 transition suitable for pumping of Eu:NaGd(WO4)2, the maximum cross-section is sabs ј 1.2 _ 10_21 cm2 at 535.5 nm with the full width at half maximum (FWHM) of 3.1 nm (at RT, for E jj a polarization). For the 5D0 / 7F4 transition, the maximum stimulated-emission cross-section is sSE ј 1.6 _ 10_21 cm2 at 698.3 nm (RT, E jj c polarization). Lifetime of the 5D0 state is 490 ± 10 ms (at RT). Under UV excitation, Eu:NaGd(WO4)2 provides intense red emission with CIE coordinates (x ј 0.671, y ј 0.329).
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https://rep.bntu.by/handle/data/34714
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