First laser operation and spectroscopic characterization of mixed garnet Yb:LuYAG ceramics

Guido Toci; Angela Pirri; Jiang Li; Tengfei Xie; Yubai Pan; Martin Nikl; Vladimir Babin; Alena Beitlerová; Matteo Vannini

doi:10.1117/12.2209558

16 March 2016 First laser operation and spectroscopic characterization of mixed garnet Yb:LuYAG ceramics

Guido Toci, Angela Pirri, Jiang Li, Tengfei Xie, Yubai Pan, Martin Nikl, Vladimir Babin, Alena Beitlerová, Matteo Vannini

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Proceedings Volume 9726, Solid State Lasers XXV: Technology and Devices; 97261N (2016) https://doi.org/10.1117/12.2209558
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

We present the optical and spectroscopic characterization and the first example of laser operation of Yb doped LuYAG ceramics, with two different compositions, namely (Lu_0.25Y_0.75)₃Al₅O₁₂ and (Lu_0.50Y_0.50)₃Al₅O₁₂, both with 15% Yb doping. Ceramic samples were prepared by reactive sintering from high purity α-Al₂O₃, Lu₂O₃, Y₂O₃, Yb₂O₃ powders using Tetraethoxysilane (TEOS) and MgO as sintering aids. After ball milling, the slurry was dried, uniaxially pressed into 20 mm diameter pellets at 20 MPa, and then cold isostatically pressed at 200 MPa. Sintering was conducted at 1850°C for 30 h under vacuum, followed by annealing in air (1500 °C, 10 h) to remove the oxygen vacancies. Laser tests were carried out in a laser cavity end pumped by a fiber coupled diode laser emitting at 936 nm. A slope efficiency as high as 65.2% with a maximum output power of 8.7 W (in quasi-CW pumping conditions) was obtained from the sample with composition (Lu_0.25Y_0.75)₃Al₅O₁₂, whereas the sample with composition (Lu_0.50Y_0.50)₃Al₅O₁₂ had a maximum slope efficiency of 49.5% (due to the higher scattering losses), and 6.7 W of maximum output power. Furthermore we characterized the tuning range of the two samples.

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Guido Toci, Angela Pirri, Jiang Li, Tengfei Xie, Yubai Pan, Martin Nikl, Vladimir Babin, Alena Beitlerová, and Matteo Vannini "First laser operation and spectroscopic characterization of mixed garnet Yb:LuYAG ceramics", Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97261N (16 March 2016); https://doi.org/10.1117/12.2209558

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