Comparative study of Yb:Lu3Al5O12 and Yb:Lu2O3 laser ceramics produced from laser-ablated nanopowders

• Published in: Ceramics international 2021-03, Vol.47 (5), p.6633-6642
• Main Authors: Basyrova, Liza, Loiko, Pavel, Maksimov, Roman, Shitov, Vladislav, Serres, Josep Maria, Griebner, Uwe, Petrov, Valentin, Aguiló, Magdalena, Díaz, Francesc, Mateos, Xavier
• Format: Article
• Language: English
• Subjects: Chemical Sciences; Garnets; Laser operation; Material chemistry; Optical ceramics; Sesquioxides
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2020.10.253

We present a comparative study of two Lu-based oxide ceramics doped with Yb3+ ions, namely Yb:Lu3Al5O12 (garnet) and Yb:Lu2O3 (sesquioxide), promising for thin-disk lasers. The ceramics are fabricated using nanopowders of 3.6 at.% Yb:Lu2O3 and Al2O3 produced by laser ablation: Yb:Lu3Al5O12 – by vacuum sintering at 1800 °C for 5 h with the addition of 1 wt% TEOS as a sintering aid, and Yb:Lu2O3 – by vacuum pre-sintering at 1250 °C for 2 h followed by Hot Isostatic Pressing at 1400 °C for 2 h under Ar gas pressure of 207 MPa. The comparison includes the structure, Raman spectra, transmission, optical spectroscopy and laser operation. The crystal-field splitting of Yb3+ multiplets is revealed for Lu3Al5O12. A continuous-wave (CW) Yb:Lu3Al5O12 ceramic microchip laser generates 5.65 W at 1031.1 nm with a slope efficiency of 67.2%. In the quasi-CW regime, the peak power is scaled up to 8.83 W. The power scaling for the Yb:Lu2O3 ceramic laser is limited by losses originating from residual coloration and inferior thermal behavior.