NMR, high frequency EPR and magnetization studies of YF 3:Tm 3+ and TmF 3

Magnetic properties of single crystal and powder samples of thulium fluoride, TmF 3 (orthorhombic Pnma space group), and single crystals of YF 3 doped with the Tm 3+ ions are studied by NMR, high-frequency EPR and dc-magnetometry. It is shown that TmF 3 is a Van Vleck paramagnet. Zero field splitting between two lowest ground state energy levels (ground 3H 6 multiplet) of Tm 3+ ion in TmF 3 crystal lattice is found to be ∼6.5 cm -1. The 19F nuclear spin-lattice relaxation in TmF 3 at liquid helium temperatures is driven by the fluctuating magnetic fields created by Tm 3+ ions occupying the lowest excited singlet

NMR, high frequency EPR and magnetization studies of YF 3:Tm 3+ and TmF 3

Magnetic properties of single crystal and powder samples of thulium fluoride, TmF 3 (orthorhombic Pnma space group), and single crystals of YF 3 doped with the Tm 3+ ions are studied by NMR, high-frequency EPR and dc-magnetometry. It is shown that TmF 3 is a Van Vleck paramagnet. Zero field splitting between two lowest ground state energy levels (ground 3H 6 multiplet) of Tm 3+ ion in TmF 3 crystal lattice is found to be ∼6.5 cm -1. The 19F nuclear spin-lattice relaxation in TmF 3 at liquid helium temperatures is driven by the fluctuating magnetic fields created by Tm 3+ ions occupying the lowest excited singlet

NMR, high frequency EPR and magnetization studies of YF 3:Tm 3+ and TmF 3

Magnetic properties of single crystal and powder samples of thulium fluoride, TmF 3 (orthorhombic Pnma space group), and single crystals of YF 3 doped with the Tm 3+ ions are studied by NMR, high-frequency EPR and dc-magnetometry. It is shown that TmF 3 is a Van Vleck paramagnet. Zero field splitting between two lowest ground state energy levels (ground 3H 6 multiplet) of Tm 3+ ion in TmF 3 crystal lattice is found to be ∼6.5 cm -1. The 19F nuclear spin-lattice relaxation in TmF 3 at liquid helium temperatures is driven by the fluctuating magnetic fields created by Tm 3+ ions occupying the lowest excited singlet

NMR, high frequency EPR and magnetization studies of YF 3:Tm 3+ and TmF 3

Magnetic properties of single crystal and powder samples of thulium fluoride, TmF 3 (orthorhombic Pnma space group), and single crystals of YF 3 doped with the Tm 3+ ions are studied by NMR, high-frequency EPR and dc-magnetometry. It is shown that TmF 3 is a Van Vleck paramagnet. Zero field splitting between two lowest ground state energy levels (ground 3H 6 multiplet) of Tm 3+ ion in TmF 3 crystal lattice is found to be ∼6.5 cm -1. The 19F nuclear spin-lattice relaxation in TmF 3 at liquid helium temperatures is driven by the fluctuating magnetic fields created by Tm 3+ ions occupying the lowest excited singlet

Modulation polarimetry of full internal reflection, broken by diamond-like films

This article presents research results on diamond-like films produced under different technological conditions. The parameter ρ — polarization difference — has been introduced. It has been found from spectral features of the parameter ρ that the interaction of electromagnetic radiation with the electronic system of specimens, which occurs in the used spectral range, consists of local and polariton surface resonances, differing in frequencies and times of relaxations. The autors concluded that the correlation in resonance intensity is defined by the structural characteristics of the specimens. These results show that modulation polarimetry is a perspective technique for diagnostics of the structural homogeneity of composite nanocluster films

Faraday rotation and photoluminescence in heavily Tb3+-doped GeO2-B2O3-Al2O3-Ga2O3 glasses for fiber-integrated magneto-optics

We report on the magneto-optical (MO) properties of heavily Tb(3+)-doped GeO(2)-B(2)O(3)-Al(2)O(3)-Ga(2)O(3) glasses towards fiber-integrated paramagnetic MO devices. For a Tb(3+) ion concentration of up to 9.7 × 10(21) cm(−3), the reported glass exhibits an absolute negative Faraday rotation of ~120 rad/T/m at 632.8 nm. The optimum spectral ratio between Verdet constant and light transmittance over the spectral window of 400–1500 nm is found for a Tb(3+) concentration of ~6.5 × 10(21) cm(−3). For this glass, the crystallization stability, expressed as the difference between glass transition temperature and onset temperature of melt crystallization exceeds 100 K, which is a prerequisite for fiber drawing. In addition, a high activation energy of crystallization is achieved at this composition. Optical absorption occurs in the NUV and blue spectral region, accompanied by Tb(3+) photoluminescence. In the heavily doped materials, a UV/blue-to-green photo-conversion gain of ~43% is achieved. The lifetime of photoluminescence is ~2.2 ms at a stimulated emission cross-section σ(em) of ~1.1 × 10(−21) cm(2) for ~ 5.0 × 10(21) cm(−3) Tb(3+). This results in an optical gain parameter σ(em)*τ of ~2.5 × 10(−24) cm(2)s, what could be of interest for implementation of a Tb(3+) fiber laser