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Performance and wavelength tuning of green emitting terbium lasers.
Optics Express 2017 March 7
Wavelength tuning experiments in the green spectral range applying Tb<sup>3+</sup>-doped LiLuF<sub>4</sub> and Tb<sup>3+</sup>/Na<sup>+</sup>-codoped CaF<sub>2</sub> single crystals are presented. While in the former case almost 100 mW could be obtained throughout a total range of 7 nm, the inhomogeneously broadened emission features of Tb<sup>3+</sup> in the CaF<sub>2</sub>-matrix allowed for a continuous tuning range exceeding 10 nm. For initial characterization, free running continuous wave laser experiments using Tb<sup>3+</sup>-doped LiLuF<sub>4</sub>, Na<sup>+</sup>:CaF<sub>2</sub>, and stoichiometric TbF<sub>3</sub> crystals were carried out resulting in efficient continuous wave laser operation in the green spectral region. The density of active centers in TbF<sub>3</sub> is among the highest that can be obtained in solid state gain materials. Nevertheless, a slope efficiency as high as 32% was obtained from this crystal. High Tb<sup>3+</sup>-densities are essential to compensate for the adherent low absorption cross sections at useful pump-wavelengths.
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