Abstract
A novel trigonal ordered langasite-type silicate crystal, Yb3+:Ca3NbGa3Si2O14 (Yb:CNGS), is characterized with respect to absorption and stimulated-emission cross-sections as well as Raman spectra using polarized light. Thanks to its excellent thermo-mechanical properties, highly-efficient multi-watt lasing is demonstrated. A compact a-cut 5 at .% Yb:CNGS crystal diode-pumped at 978 nm generated a maximum output power of 7.27 W at 1062-1068 nm with a slope efficiency of 78%. These values represent record parameters for ~1 μm lasers based on langasite-type crystals. The very broad and smooth gain cross sections of Yb:CNGS are attractive for ultrashort pulse and broadly tunable lasers at ~1 μm.
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