Showing papers in "Optical Materials in 2007"

TL;DR: In this article, the results of recent research on the fabrication, investigation and applications of the ion-implanted optical waveguides in various optical materials, including crystals and non-crystalline glasses, are reviewed.

TL;DR: In this paper, two approaches to charge compensation, (a) 2Ca(2+) -> EU3+ + M+, where M+ is a monovalent cation like Li+, Na+ and K+ acting as a charge compensator, and (b) 3Ca( 2+) -> 2EU(3+) + vacancy, are investigated.

TL;DR: In this article, the decay curves of Sm3-doped phosphate and fluorophosphate glasses are perfectly single exponential for lower concentration (0.01) and gradually change to non-exponential for higher concentrations.

TL;DR: In this article, the micro-pulling-down (μ-PD) method is used to grow shape and/or device-size crystals from the melt using a single step process.

TL;DR: In this paper, both doped and undoped zinc oxide thin films were deposited on glass substrates by a sol-gel technique, and a homogeneous and stable solution was prepared by dissolving ZnO acetate (ZnAc) in the solution of 2-propanol and ethanolamine (EA) followed by mixing with the doping solutions.

TL;DR: In this paper, a flashlamp-pumped laser operation with the ceramic rod was demonstrated and a laser diode (LD) pumped composite ceramic laser was also demonstrated, where the optical properties and microstructure of those ceramics were investigated.

TL;DR: In this paper, a novel phosphor, NaEu(MoO 4 ) 2, co-doped with Bi 3+ ions and Sm 3+ ion was prepared by solid-state reaction technique, and its photoluminescent properties were investigated.

TL;DR: In this article, a dc magnetron sputtering in an Ar+O2 gas mixture using two types of targets, one commercially available zinc metal (purity 99.99%) and the other was pressed Zn metal powder, was studied.

TL;DR: In this article, the authors report on the design and fabrication of porous silicon based rugate filters, which achieve narrow line-width, high reflectivity optical filters made entirely from silicon by continuously varying of the refractive index of Si and apodizing the index profile of the structure.

TL;DR: In this paper, the effect of annealing temperature on the structural, surface morphological and optical properties of thin tungsten oxide (WO 3 ) films has been studied.

TL;DR: In this article, the emission color of Lu3Al5O12:Ce3+ (LuAG :Ce) phosphors was investigated and the authors attributed the changes in emission color with Ce3+ concentration to a combination of inhomogenous broadening for Ce3+, in LuAG and energy transfer from high energy ions to low energy ions.

TL;DR: In this paper, the emission and excitation spectra of the samples were investigated using a solid state chemical reaction method and the energy transfer from Ce3+ to Eu2+ was observed.

TL;DR: In this article, the laser conversion efficiency of pore-free polycrystalline Nd-doped YAG ceramics is extremely high and its optical quality is comparable to that of commercial high quality Nd:YAG single crystal.

TL;DR: In this article, the structural and optical properties of transparent titanium oxide (TiO 2 ) films were investigated for different annealing temperatures and different number of coatings, showing that the anatase crystalline phase appears beyond 350°C for the four layers TiO 2 film.

TL;DR: In this article, a redish orange light emitting phosphor, CaSnO 3 :Sm 3+, is prepared via a two-step approach including the room temperature synthesis of CaSn(OH) 6 precursor and then convert it into CaSmO 3 by calcination and its optical properties are systematically investigated.

TL;DR: In this paper, a high pressure low temperature sintering technique (HPLT) was used to construct YAG nanoceramics composed of nanosized grains.

TL;DR: In this paper, X-ray diffraction (XRD), electrical resistivity, XAS, optical transmission spectrum, and Hall-effect measurements were utilized in order to study the properties of the Ti-doped ZnO films.

TL;DR: In this paper, the authors observed broad infrared luminescence covering the optical telecommunication wavelength region of O, E and S bands from bismuth-doped zinc aluminosilicate glasses and glass-ceramics.

TL;DR: In this article, the influence of rare-earth doped CaF2 nano-powders, as precursors for transparent ceramics, by direct precipitation, micro-emulsion and mechanosynthesis is described.

TL;DR: In this article, the phase evolution, morphology and luminescent properties of the obtained materials were characterized by XRD, TEM, photoluminescent and radioluminescence spectra excited by blue light and X-ray, respectively.

TL;DR: In this article, the authors measured the photoluminescence of nanocrystalline cubic ZnS nanoparticles with an average size ∼6nm and calculated the direct allowed bandgap values in the range 3.89-4.12 eV.

TL;DR: PbO-Ga2O3-P2O5 glasses containing different concentrations of Cr2O 3 ranging from 0 to 1.0% were prepared and a number of studies viz., differential thermal analysis, infrared, optical absorption, ESR and Raman spectra of these glasses have been carried out as a function of chromium ion concentration as mentioned in this paper.

TL;DR: In this article, the optical band gaps (Eg s) of the as-deposited films have been measured and the relation of Eg to the covalent coordination number, Z, is demonstrated by varying the composition parameter y of the thin films.

TL;DR: In this article, the effects of substrate temperature on the structural, chemical and optical properties of thin films of chromium oxide were investigated and it was found that the refractive index, the extinction coefficient and the optical bandgap all increased with substrate temperature.

TL;DR: In this article, the Akermanite phosphors of Eu 2+ activated M 2 MgSi 2 O 7 (Mǫ, Sr) were synthesized by solid-state reactions under a weak reductive atmosphere, and systematically characterized by photoluminescence excitation and emission spectra.

TL;DR: In this paper, the dependence of luminescence intensity on the Eu 3+ concentration in BaZrO 3 :Eu was studied, and the X-ray diffraction (XRD) and photoluminescence (PL) spectra were analyzed.

TL;DR: Combustion synthesis of some silicate phosphors is described in this article, which is based on the exothermic reaction between urea and ammonium nitrate and subsequent heat transfer to the reactants.

TL;DR: In this article, the electrooptic properties and structural peculiarities of polymer dispersed liquid crystals (PDLC) doped with small amount of inorganic nanoparticles (NP) are considered.

TL;DR: In this paper, the synthesis and optical properties of nanocrystalline powders of V-doped ZnO (i.e., Zn 0.95 V 0.05 O, Zn0.90V 0.10 O, and Zn