Abstract
The disordered crystal was grown with high optical quality by the flux method using as a solvent. The crystal possesses tetragonal symmetry belonging to the space group , with two nonequivalent sites occupied by the dopant. Spectroscopic studies at 5 and provided information on the Stark energy-level splitting and the absorption and emission cross sections of the ion. Laser operation of was obtained for the first time in such a Li-containing double tungstate or molybdate. The tuning range with a Ti:sapphire laser pumping extended over for the σ polarization and for the π polarization. Without a tuning element the laser performance was similar for the two polarizations. By using a 10% transmission output coupler, a maximum output power of was obtained with a slope efficiency and the absorbed pump power at threshold was . Laser operation was also achieved by pumping with a tapered diode laser and a fiber-coupled diode laser module, with a Yb laser output power of in the latter case.
© 2006 Optical Society of America
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