We have grown high-quality LuAG:Yb3+ crystals with 0.75, 3.8, 10, 12, 15, 20, and 50 at. % concentrations by the vertical Bridgman method. With low-temperature spectroscopy the Stark sublevel structure of the <sup>2</sup>F<sub>7/2</sub> ground state and the <sup>2</sup>F<sub>5/2</sub> excited state has been determined. With room-temperature spectroscopy, the emission cross section was found to be 3×10<sup>−20</sup> cm<sup>2</sup>, being 1.5 times the YAG:Yb3+ emission cross section. The luminescence quantum efficiency was measured in samples with different Yb3+ concentrations. Its value was found to be 90% for 3.8 and 10 at. %, 84% for 20 at. %, and 70% for 50 at. % Yb3+. The laser-emission tunability under diode pumping was found to extend from 1045 up to 1095 nm in a 12 at. % sample with 3.15 mm thickness.
© 2006 Optical Society of America
Original Manuscript: March 23, 2005
Revised Manuscript: July 22, 2005
Manuscript Accepted: September 7, 2005
A. Brenier, Y. Guyot, H. Canibano, G. Boulon, A. Ródenas, D. Jaque, A. Eganyan, and A. G. Petrosyan, "Growth, spectroscopic, and laser properties of Yb3+-doped Lu3Al5O12 garnet crystal," J. Opt. Soc. Am. B 23, 676-683 (2006)