17 February 2017 Spectroscopy and laser operation of Indium-modified Yb:KLuW: a promising crystal for femtosecond lasers
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Abstract
We report on the growth, spectroscopic and laser characterization of a novel monoclinic laser crystal, 3.5 at.% Yb, 5.5 at.% In:KLu(WO4)2 (Yb,In:KLuW). Single-crystals of high optical quality are grown by the TSSG method. The absorption, stimulated-emission and gain cross-sections are determined for this material at room temperature with polarized light. The maximum σabs is 9.9×10-20 cm2 at 980.8 nm for light polarization E || Nm. The radiative lifetime of Yb3+ in Yb,In:KLuW is 237±5 μs. The stimulated-emission cross-sections are σSE(m) = 2.4×10-20 cm2 at 1022.4 nm and σSE(p) = 1.3×10-20 cm2 at 1039.1 nm corresponding to an emission bandwidth of >30 nm and >35 nm, respectively. A diode-pumped Ng-cut Yb,In:KLuW microchip laser generates 4.11 W at 1047-1052 nm with a slope efficiency of 78%. Passive Q-switching of a Yb,In:KLuW laser is also demonstrated. The Yb,In:KLuW crystal seems very promising for sub-100 fs mode-locked lasers.
Conference Presentation
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Xavier Mateos, Xavier Mateos, Josep Maria Serres, Josep Maria Serres, Pavel Loiko, Pavel Loiko, Konstantin Yumashev, Konstantin Yumashev, Uwe Griebner, Uwe Griebner, Valentin Petrov, Valentin Petrov, Magdalena Aguiló, Magdalena Aguiló, Francesc Díaz, Francesc Díaz, } "Spectroscopy and laser operation of Indium-modified Yb:KLuW: a promising crystal for femtosecond lasers", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008214 (17 February 2017); doi: 10.1117/12.2253687; https://doi.org/10.1117/12.2253687
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