Luping Wang

OH− absorption and holographic storage properties of Sc(0, 1, 2, 3):Ru:Fe:LiNbO3 crystals

A series of Sc:Ru:Fe:LiNbO3 crystals with various levels of Sc2O3(0, 1, 2, and 3 mol%) doping were grown from congruent melts in air by using the Czochralski technique. The defect structures and photorefractive properties of the Sc:Ru:Fe:LiNbO3 crystals were investigated by acquiring infrared spectra of the crystals and performing two-wavelength nonvolatile experiments, respectively. Our results showed the holographic storage properties of Ru:Fe:LiNbO3 crystals to be enhanced by doping them with a high concentration of Sc2O3, and indicated Sc:Ru:Fe:LiNbO3 crystals to constitute a promising medium for holographic storage.

Effect of dopant concentration on the spectra characteristic in Zr4+ doped Yb:Nd:LiNbO3 crystals

Abstract A series of Yb:Nd:LiNbO 3 crystals tridoped with various concentrations of Zr 4+ (1 mol.%, 2 mol.% and 4 mol.%) were grown by the Czochralski technique from the congruent melt. The X-ray powder diffraction, UV-Vis-NIR absorption spectra and IR transmittance spectra were measured to analyze the crystal composition and defect structure. The Zr 4+ , Yb 3+ and Nd 3+ ions in LiNbO 3 crystal had two effects: volume compensation effect and ion valence state compensation effect. The ZrO 2 doping threshold concentration was nearly 2.0 mol.%. The fluorescence emissions of Nd 3+ ions and Yb 3+ ions were observed under 808 nm excitation. The intensity of fluorescence emissions enhanced with the increasing of the Zr 4+ doping concentrations. The Zr:Yb:Nd:LiNbO 3 crystals with 4 mol.% doping concentration of Zr 4+ ion revealed strong emission around 1 μm, which is of great significance for laser materials.

Dopant occupancy and UV-VIS-NIR spectroscopy of Mg (0, 4, 5 and 6 mol.%):Dy:LiNbO3 crystal

A series of Dy:LiNbO3 crystals with x mol.% Mg2+ ions (x =0, 4, 5 and 6 mol.%) were grown by the Czochralski method. The effective segregation coefficient of Mg2+ and Dy3+ ions was studied by the inductively coupled plasma-atomic emission spectrometry (ICP-AES). UV-VIS-NIR absorption spectra and Judd–Ofelt theory were used to investigate their spectroscopic properties. J–O intensity parameters (Ω2 = 7.53 × 10−20cm2, Ω4 = 6.98 × 10−20cm2, and Ω6 = 3.09 × 10−20cm2) and larger spectroscopic quality factor (X = 2.26) for Mg:(6 mol.%)Dy:LiNbO3 crystals were obtained.