Characterization Of Yb Research Articles

掺镱石英光纤预制棒的制备与表征

掺镱石英光纤预制棒的制备与表征

Spectroscopic characteristics of Yb3+:LiLa(WO4)2 crystal

The spectroscopic characterization and fluorescence dynamics of Yb3+:LiLa(WO4)2 crystal are investigated. The Yb3+:LiLa(WO4)2 crystal exhibits a broad absorption and emission spectral bands, large absorption and emission cross sections, and moderate fluorescence lifetime. Blue light emission around 480 nm is observed at 10 K and is demonstrated through cooperative upconversion from the deexcitation of excited Yb3+-Yb3+ pairs.

Characterization of Yb 3+ clusters in silica glass preforms

The aim of this study is the optimisation of Yb doped silica preforms which are used for the realization of high power laser fibres. A spectroscopic study has thus been carried on using a stable setup conducing to quantify in the same time the Yb 3+ emission in the visible and in the infrared spectral ranges. In this way, the impact of the Al ions on the silica solubility as well as the low Yb 3+ doping levels reachable when the silica preforms are simply doped with Yb ions, have been clearly put in evidence.

Growth of YbF3-doped CaF2 crystals and characterization of Yb3+/Yb2+ conversion

Abstract Calcium fluoride crystals doped with YbF 3 and PbF 2 -, NaF- and LiF-codoped were grown using the vertical Bridgman method. Transparent, high quality, with various high Yb 2+ contents in the as-grown crystals has been obtained using a special procedure. The optical absorption spectra reveal the characteristic ultraviolet (UV) absorption bands of the divalent Yb ions. Influence of the codoping with Pb 2+ , Li + and Na + ions on the absorption spectra and on the Yb 2+ ions content has been studied. High-intensity emission bands in the near-UV spectral region, not reported before, have been observed for excitation by 230 nm. A comparison of our results with those obtained by other authors is also given.

Growth and characterization of Yb 3+ doped Y 2SiO 5 layers on Y 2SiO 5 substrate for laser applications

We report on the epitaxial growth and spectroscopic study of highly doped Y 2SiO 5:Yb 3+ (YSO:Yb) thin films on YSO substrates. The realization of Ge, La and Gd-codoped high quality thin films, with thickness up to 100 μm, is demonstrated. YSO:Yb layers have their fluorescence and absorption spectra similar to the bulk ones, with a globally higher crystalline quality. The Yb 3+ lifetime evolution exhibits a particularly slow decrease with Yb doping, proof of a low extrinsic quenching centers concentration. The refractive index increase with respect to dopants concentration is measured, and a phenomenological law is proposed. Such highly doped YSO:Yb layers could be an interesting alternative for active integrated optics or laser devices.

Growth and spectral properties of Yb3+ doped LaVO4 crystal

The spectroscopic characterizations of Yb3+:LaVO4 crystal at room temperature have been investigated using the reciprocity method (RM) and the Füchtbauer-Ladenburg (F-L) method. The absorption and emission cross-sections are 2·11 × 10−20 cm2 at 978 nm and 8·5 × 10−20 cm2 at 1041 nm respectively. The fluorescence lifetime is 400 μs. The laser performance parameters βmin, Ipsat and Imin were obtained. Based on the spectroscopic characterization of Yb3+:LaVO4 crystal, it was suggested as a candidate of laser gain materials.

Crystal growth and characterization of Yb 3+-doped Gd 3Ga 5O 12

Single crystals of (Yb x Gd 1− x ) 3Ga 5O 12 (0.0 ≤ x ≤ 1.0) have been grown by the micro-pulling-down method. Formation of continuous solid solutions with a garnet structure was confirmed. Composition dependence of the lattice constant, thermal diffusivity, specific heat capacity and thermal conductivity was investigated. Assignment of the Yb 3+-energy levels in Gd 3Ga 5O 12-host lattice has been performed by using absorption, emission and Raman spectroscopy measurements at both, room temperature and at 12 K.

Growth and spectral characterization of Yb3+:LiLa(WO4)2 crystal

Abstract The growth and spectroscopic properties of Yb3+:LiLa(WO4)2 crystal were investigated. Yb3+:LiLa(WO4)2 crystal with dimension ∅22 × 18 mm2 has been grown by the Czochralski method. Yb3+:LiLa(WO4)2 crystal has a larger FWHM of 10 nm at 976 nm. The absorption and emission cross-sections of Yb3+:LiLa(WO4)2 crystal are 2.46 × 10−20 cm2 at 976 nm and 0.39 × 10−20 cm2 at 1039 nm, respectively. The radiative lifetime and fluorescence lifetime of Yb3+:LiLa(WO4)2 crystal are 0.365 ms and 1.07 ms, respectively.

Growth and characterization of Yb:BaWO 4 single crystal

The materials synthesis of polycrystalline of Yb 3+: BaWO 4 by the way of liquid-phase reaction, and the raw materials of synthesis were detected with ultraviolet spectrum and X-ray powder diffraction method. The colorless and un-cracked Yb 3+: BaWO 4 crystal was grown by Czochralski method for the first time. The growth condition and annealing technology was investigated. The transmission and absorption spectra of Yb 3+: BaWO 4 was measured. The result indicates that BaWO 4 can be laser host material.

Growth and Characterization of Yb3+-doped (Lu,Y)AlO3 Fiber Single Crystals Grown by the Micro-Pulling-Down Method

Yb3+-doped (Lu,Y)AlO3 single crystals have been grown by the micro-pulling-down method with a radio-frequency heating system. Starting melt compositions of LuxY0.9-xYb0.1AlO3 were varied with x=0.1, 0.2, 0.35, and 0.4. The best Yb3+-doped (Lu,Y)AlO3 single crystals were obtained applying a pulling rate of 0.12 mm/min. To investigate the compositional homogeneity, the effective segregation coefficient of Lu and Yb ions was estimated keff=1.02 and 1.05 for Lu0.2Y0.7Yb0.1AlO3 crystal, respectively. Absorption, radio-luminescence and luminescence decay kinetic of Yb3+-doped (Lu,Y)AlO3 was investigated for room temperature conditions and found to be similar to that of Yb3+-doped YAlO3. Very fast charge transfer luminescence of Yb3+ in the near ultraviolet to visible spectral range and the high density of the LuAlO3 make this material a promising candidate for fast scintillators.

Spectroscopic characterization of Yb3+- doped YLiF4laser single crystals grown by the Czochralski method

Spectroscopic properties of Yb 3+ ion in the YLiF 4 host with different concentrations are investigated at room and low temperature. Assignment of Yb 3+ energy levels is proposed. A first estimation of this host as laser material is done and a comparison with other oxides is presented.

Growth and characterization of Yb3+ doped garnet crystals for scintillator application

Abstract Several concentration of Yb-doped Lu 3 Al 5 O 12 (Yb:LuAG) and Lu 3 Ga 5 O 12 (Yb:LGG) single crystals were grown by the micro-pulling-down method. The crystals were seeded-grown in the 〈1 1 1〉 direction and transparent and crack free crystals were obtained. Photoluminescence spectra and decay kinetics of these crystals were studied. Charge transfer luminescence of Yb 3+ was observed in both crystals. Mean decay time of about 25 ns at 90 K and strong thermal quenching at room temperature was measured for Yb 5%:LuAG. Radioluminescence intensity was compared to the standard BGO sample.

Growth and characterization of Yb 3+-doped YAlO 3 fiber single crystals grown by the modified micro-pulling-down method

The Yb 3+-doped YAlO 3 fiber single crystals were grown by the modified micro-pulling-down method with the radiofrequency system. The starting melt compositions of (Y 1− x Yb x )AlO 3 were varied as x=0.05, 0.1 and 0.2. The best Yb 3+-doped YAlO 3 fiber single crystals were obtained for pulling-down rate equal to 0.12 mm/min. The grown fiber crystals were transparent and nearly colorless. The purpose of this study was to reveal the conditions of twin and inclusion-free growth of the Yb 3+-doped YAlO 3 single crystals. To investigate the homogeneity of the grown crystals, distribution coefficient of the Y and Yb ions was measured. The transmission, photo- and radioluminescence features of Yb 3+-doped YAlO 3 crystal were also investigated in this study. Due to very fast charge transfer luminescence of Yb 3+ in near-UV–visible spectral range and higher density of Yb-rich YAlO 3, such material is promising candidate for fast scintillators.

Characterization of Yb:YAG and Yb:YAP scintillators by means of LAAPD at temperature around 100K

A new class of scintillators based on charge-transfer luminescence of the Yb 3+ ion is being investigated for the last few years. The main prospect for these scintillators is in neutrino physics. The crystals manifest maximum light output at temperatures 100 K< T <150 K. In this range Large Area Avalanche Photodiodes (LAAPD) are the best photodetectors. In this work Yb(25%):YAG and Yb(5%):YAP scintillators were characterized by means of a 16 mm diameter API LAAPD at temperatures around 100 K. Light yield and energy resolution were determined. Light yield non-proportionality was detected for all the crystals comparing light output at 661.6 and 59.6 keV peaks.

Near Infrared Luminescence of Lanthanides in Complexes with Organic Dyes

Spectral-luminescence characteristics of Yb3+ and Nd3+ ions in water solutions of their complexes with some organic dyes of sulfophenylphthalexones group have been considered. Complexes can be efficiently excited with visible light (λexc = 532 nm). 4f-Luminescence as a result of energy transfer from the dye moiety to the lanthanide ion was shown. Complexation of new polydentate ligand L of sulfophenylphthalexones type increases the luminescence lifetimes because of the reduced solvation of the ion by water. They were determined as 12.60 μs for complex Yb-L and 1.45 μs for Nd-L.

Preparation and characterization of Yb:Y 3Al 5O 12 fiber crystals

A micro-pulling-down process employing Ir crucibles and RF heating has been used to grow single crystal fibers of Yb-doped Y 3Al 5O 12 garnet (YAG). Single crystals ranging up to 550 mm in length have been produced. The fibers were about 1 mm in diameter and were seeded-grown in the <111> direction. Results of X-ray rocking curve measurements and transmittance data were used to discuss the crystalline perfection of the fibers. The effective segregation coefficient of Yb 3+ in the process described is reported to be slightly less than 1.0 at a growth rate of about 5 mm/min.

Characterization of YB66crystals for use as a new soft X-ray monochromator with synchrotron radiation

Characterization of YB₆₆crystals for use as a new soft X-ray monochromator with synchrotron radiation