Optical and Magneto-Optical Properties of Na₀.₃₇₅Tb₀.₆₂₅F₂.₂₅ Crystal

Optical and magneto-optical spectra of the Na0.375Tb0.625F2.25 crystal have been studied within the ultraviolet and visible spectral range. It has been established that within the wavelength range of 535-560 nm there is an intense luminescence band caused by intra-configurational 4f→4f transitions 5D4→7F5. In the luminescence band 5D4→7F5 and 5D4→7F4 the radiative 4f→4f transitions have been identified and it has been established that the magnetic dipole transitions dominate in the secondary emission spectra. Analysis of magneto-optical research data has demonstrated that the C-term of magneto-optical activity plays a significant role in the mechanism of occurrence of magneto-optical effects on luminescence bands caused by “forbidden” 4f→4f transitions. A comparative analysis of the dispersion dependence of the Verdet constant of the Na0.375Tb0.625F2.25 single crystal showed that it is about 90% of the Verdet constant of the well known Tb3Ga5O12 crystal, which demonstrates a good magneto-optical properties of the new synthesized crystal.