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The photoluminescence (PL) of LiTb(PO), LiGdSm(PO), and LiTbSm(PO) under vacuum ultraviolet (VUV)/ultraviolet (UV) excitation were studied. We observed the VUV-UV sensitization of Sm emission (561 nm, 601 nm, 649 nm, and 710 nm) by Tb in LiTb(PO):Sm, which leads to the yellow light emission (486 nm, 546 nm, 561 nm, 587 nm, 601 nm, 621 nm, 649 nm, and 710 nm) of LiTb(PO):Sm phosphor under UV and VUV excitation. The emission is a result of partial energy transfer from Tb to Sm, which is discussed in detail in terms of the excitation and emission spectra and decay curves. [ABSTRACT FROM AUTHOR]

The polarized absorption spectra, polarized fluorescence spectra, and fluorescence decay curves of Pr3+ ions in anisotropic PbWO4 single crystal, which was grown by the modified Bridgman method, were measured at room temperature. The standard and modified Judd-Ofelt theories, extended to anisotropic crystal, have been applied to analyze the spectra. The spectroscopic parameters, including the Judd-Ofelt intensity parameters Ot?(t=2,4,6), spontaneous emission probabilities, fluorescence branching ratios, radiative lifetimes, stimulated emission cross sections, and fluorescence quantum efficiencies, were estimated. The good spectroscopic properties show the possible application of the Pr3+-doped PbWO4 crystal as solid-state and self-stimulated Raman laser materials. [ABSTRACT FROM AUTHOR]

Yb:YAl(BO) crystals were grown in LiWO-BO and KMoO-BO fluxes, respectively. In the same experimental conditions, a shorter ultraviolet absorption edge of 278 nm, longer fluorescence lifetime of 1.1 ms, higher slope efficiency of 58%, and lower threshold of 2.4 W were obtained in a Yb:YAl(BO) crystal grown in LiWO-BO flux, whereas the corresponding values for the crystal grown in KMoO-BO traditional flux were 318 nm, 0.7 ms, 46%, and 3.1 W, respectively. Therefore, spectroscopic and laser performances of the one grown in LiWO-BO flux are enhanced due to the improved crystal optical quality. [ABSTRACT FROM AUTHOR]

A Pr3+:NaGd(MoO4)2 single crystal has been grown by the Czochralski method. The polarized absorption spectra, polarized fluorescence spectra, and fluorescence decay curves of the crystal were measured at room temperature. The Judd–Ofelt intensity parameters Ω t, q ( t=2,4,6) and the spectroscopic parameters related to the 3 P 0 and 1 D 2 multiplets were obtained and analyzed. The decay mechanisms for the 3 P 0 and 1 D 2 multiplets were also discussed. [ABSTRACT FROM AUTHOR]

An Er3+:Bi2(MoO4)3 single crystal has been grown by the Czochralski technique. The Stark sublevels of the 4I15/2 and 4I13/2 multiplets of Er3+ ions in the crystal were determined. The polarized absorption spectra, polarized fluorescence spectra, and fluorescence decay curve of the crystal were measured at room temperature and the relevant spectroscopic parameters, including the Judd–Ofelt intensity parameters, spontaneous emission probability, fluorescence branching ratio, radiative lifetime, and stimulated emission cross section, were estimated. The effect of re-absorption on the spectroscopic parameters was discussed. When the crystal was excited at 977 nm, up-conversion green fluorescence was observed and discussed. [ABSTRACT FROM AUTHOR]

A Bi2(MoO4)3 single crystal doped with Pr3+ ions has been grown by the Czochralski technique. The polarized absorption and fluorescence spectra as well as the fluorescence decay curve of Pr3+ ions in the crystal were measured at room temperature. The spectroscopic parameters, including the Judd–Ofelt intensity parameters Ωt (t=2, 4, and 6), spontaneous emission probabilities, fluorescence branching ratios, radiative lifetimes, stimulated emission cross sections, and fluorescence quantum efficiencies, were calculated. The spectral properties related to laser performance of this crystal were analyzed. The 1 D 2 multiplet of the crystal may be a good upper level for a solid-state laser. [ABSTRACT FROM AUTHOR]

An Er3+/Yb3+-codoped Li6Y(BO3)3 crystal was grown by the Czochralski method. The polarized absorption spectra and the fluorescence decay curve were recorded. The efficiency of energy transfer from Yb3+ to Er3+ ions was estimated. Quasi-continuous-wave output power of 325 mW at 1594 nm was realized under the absorbed pump power of 10.4 W in a hemispherical cavity. The absorbed pump threshold and slope efficiency of the laser are 6.0 W and 7.2%, respectively. [ABSTRACT FROM AUTHOR]