Microchip Yb:CaLnAlO.sub.4./sub. lasers with up to 91% slope efficiency

0481248 - FZÚ 2018 RIV US eng J - Journal Article
Loiko, P. - Serres, J.M. - Mateos, X. - Xu, X. - Xu, J. - Jambunathan, Venkatesan - Navrátil, Petr - Lucianetti, Antonio - Mocek, Tomáš - Zhang, X. - Griebner, U. - Petrov, V. - Aguilo, M. - Diaz, F. - Major, A.
Microchip Yb:CaLnAlO₄ lasers with up to 91% slope efficiency.
Optics Letters. Roč. 42, č. 13 (2017), s. 2431-2434. ISSN 0146-9592. E-ISSN 1539-4794
R&D Projects: GA MŠMT LO1602; GA MŠMT LM2015086
EU Projects: European Commission(XE) 657424 - QuantumLaP
Institutional support: RVO:68378271
Keywords : microchip
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.589, year: 2017

Multi-watt continuous-wave (CW) operation of tetragonal rare-earth calcium aluminate Yb:CaLnAlO(4) (Ln = Gd,Y))crystals in plano-plano microchip lasers was demonstrated with an almost quantum-defect-limited slope efficiency. Pumped at 978 nm by an InGaAs laser diode, a 3.4 mm long 8 at. % Yb:CaGdAlO4 laser generated 7.79 W at 1057 1065 nm with a slope efficiency of n = 84% (with respect to the absorbed pump power). An even higher n = 91% was achieved with a 2.5 mm long 3 at. % Yb: CaYAlO4 laser, from which 5.06 W were extracted at 1048 1056 nm. Both lasers produced linearly polarized output (sigma- polarization) with an almost circular diffraction-limited beam (M-x(2),(y) < 1.1).
Permanent Link: http://hdl.handle.net/11104/0276842