title: Spectroscopy of Tm and Ho in KYF(4) single crystals.
abstract: We report on the spectroscopic characterization of Tm :KYF(4) and Ho :KYF(4) single crystals. The energy level splittings are given, as well as the Judd-Ofelt parameters, the polarized absorption and emission cross sections and the energy transfer coefficients. This allows to have a deeper understanding of the Tm-Ho-codoped KYF(4) system and shows KYF(4) to be a promising material for widely tunable and efficient 2 µm laser operation.
authors.forename: Elisa
authors.initials: E
authors.lastname: Sani
authors.forename: Alessandra
authors.initials: A
authors.lastname: Toncelli
authors.forename: Mauro
authors.initials: M
authors.lastname: Tonelli