A spectrometer for semiautomatic two photon fluorescence spectroscopy (and application to CaF₂:Eu²⁺studies)

A system for gases, liquids and diluted solid systems is described. Two signals (one from the probe, one from a laser intensity monitor as a reference) for deriving the two photon absorption constant are automatically measured and processed. Some experimental results on CaF 2 doped with Eu 2+ at 4.2K are shown as an application.