Temperature dependent absorption and emission spectra of Tm:CaF2

Jürgen Reiter, Jörg Körner, Jan Pejchal, Akira Yoshikawa, Joachim Hein, Malte C. Kaluza

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We present Emission and absorption cross sections of thulium doped calcium fluoride (Tm:CaF2) in the visible to short wave infrared (SWIR) wavelength range for temperatures between 80 K and 300 K. For spectral regions of high and low absorption the McCumber relation and the Fuchtbauer-Ladenburg equation have been used to give reliable results. Furthermore, an estimation for the cross relaxation efficiency is derived from the emission spectra as a function of doping concentration and temperature. In addition, nearly re-absorption-free fluorescence lifetimes for various doping concentrations were studied. It was found that a double exponential fit model is better suited than a migration model to represent the fluorescence decay curves. The measurement results are interpreted in the light of the application of Tm:CaF2 as an efficient active medium in high-energy class diode-pumped solid state lasers.

Original languageEnglish
Pages (from-to)2142-2158
Number of pages17
JournalOptical Materials Express
Issue number9
Publication statusPublished - 2020 Sept 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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