Crystal growth, low-temperature spectroscopy and multi-watt laser operation of Yb:Ca.sub.3./sub.NbGa.sub.3./sub.Si.sub.2./sub.O.sub.14./sub.

0492541 - FZÚ 2019 RIV NL eng J - Journal Article
Zhang, X. - Loiko, P. - Mateos, X. - Serres, J.M. - Ren, J. - Guo, J. - Cheng, R. - Gao, C. - Dong, Q. - Jambunathan, Venkatesan - Lucianetti, Antonio - Mocek, Tomáš - Vilejshikova, E. - Griebner, U. - Petrov, V. - Wang, Z. - Guo, B. - Xu, X. - Aguilo, M. - Diaz, F.
Crystal growth, low-temperature spectroscopy and multi-watt laser operation of Yb:Ca₃NbGa₃Si₂O₁₄.
Journal of Luminescence. Roč. 197, May (2018), s. 90-97. ISSN 0022-2313. E-ISSN 1872-7883
R&D Projects: GA MŠMT LO1602; GA MŠMT EF15_006/0000674; GA MŠMT LM2015086
EU Projects: European Commission(XE) 739573 - HiLASE CoE
Grant - others:OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institutional support: RVO:68378271
Keywords : silicate crystals * ytterbium * crystal growth * spectroscopy * stark splitting * stimulated emission
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.961, year: 2018

We report on the crystal growth, structure, room- and low-temperature (6 K) absorption and emission spectroscopy of a 3 at% Yb3+-doped trigonal ordered langasite-type silicate crystal, Ca3NbGa3Si2O14 (Yb: CNGS). The Rietveld refinement data are presented. Absorption, stimulated-emission and gain cross-sections are determined for the Yb3+ ion in CNGS for p and s polarizations. The maximum stimulated emission cross-section amounts to sigma(SE) = 0.97 x 10(-20) cm(-2) at 10(14) nm (sigma-polarization). The Stark splitting of the Yb3+ multiplets is resolved. Microchip laser operation is obtained with both a-cut and c-cut 3 at% Yb: CNGS samples under endpumping at 976 nm by a Volume Bragg Grating-stabilized diode laser. For the latter cut, the maximum output power reaches 7.61 W at 1048-1060 nm with a slope efficiency of 59%. By varying the output coupling, multiwatt emission over a 50 nm-broad spectral range is achieved.
Permanent Link: http://hdl.handle.net/11104/0286033