Abstract
The investigation of the optical and magnetic properties of the rare earth ions in wide band gap fluoride dielectric crystals could trigger a new variety of applications using high excited electronic states. By applying laser-induced fluorescence spectroscopy in the vacuum ultraviolet (VUV) region of the spectrum (100–200 nm), it was found strong emission in the VUV and UV spectral regions due to the strong dipole 4f n−1 5d→4f n interconfigurational transitions of rare earth (RE) ions in wide band gap fluoride crystals. The emitted radiation is highly directional suggesting a strong paramagnetic response of the 4f n−1 5d electronic configuration following VUV laser excitation at 157 nm. In addition, the concentration of the Pr 3+ and Tm 3+ ions in KY 3F 10 and CaF 2 crystal hosts can be accurately evaluated by measuring the magnetic moment of the Pr 3+ and Tm 3+ ions, using the vibrating sample magnetometer method, in a non-destructive way for the first time to our knowledge. Since the efficiency of the laser crystals doped with trivalent RE ions depends on the degree of the homogeneous distribution of the concentration of the trivalent RE ions over the crystal volume, the method can be used to evaluate the quality of the laser crystals.
Published Version
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