title: Performance and wavelength tuning of green emitting terbium lasers.
abstract: Wavelength tuning experiments in the green spectral range applying Tb3+-doped LiLuF4and Tb3+/Na+-codoped CaF2single 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 Tb3+in the CaF2-matrix allowed for a continuous tuning range exceeding 10 nm. For initial characterization, free running continuous wave laser experiments using Tb3+-doped LiLuF4, Na+:CaF2, and stoichiometric TbF3crystals were carried out resulting in efficient continuous wave laser operation in the green spectral region. The density of active centers in TbF3is 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 Tb3+-densities are essential to compensate for the adherent low absorption cross sections at useful pump-wavelengths.
authors.forename: Philip Werner
authors.initials: PW
authors.lastname: Metz
authors.forename: Daniel-Timo
authors.initials: DT
authors.lastname: Marzahl
authors.forename: Günter
authors.initials: G
authors.lastname: Huber
authors.forename: Christian
authors.initials: C
authors.lastname: Kränkel