Showing papers in "Optical Materials in 2004"

TL;DR: In this article, the compositional properties of the layers were analyzed by FTIR and ATR infrared spectroscopy techniques, and a correlation between the N-H concentration and absorption loss was verified for silicon oxynitride slab waveguides.

TL;DR: In this article, material, spectroscopic, laser and nonlinear optical properties of wide-band Cr 2+ -doped II-VI materials have been reviewed and a considerable modification of the mode-locking techniques and reconsideration of the existing theories are discussed.

TL;DR: In this article, the extent of solarization is strongly influenced by many factors such as glass matrix, dopants, or irradiation source, which can be detected with optical and EPR spectroscopy.

TL;DR: In this article, the photoluminescence (PL) spectra of polycrystalline ZnO films have been shown to have blue emission peaks centered at 430 nm and the variation of these peak intensities and that of the free-carrier concentration were investigated at different annealing temperatures.

TL;DR: In this paper, a heat mirror was built based on the hafnium oxide/silver/hafnium oxide-glass system, which was found to be transparent in the visible with an average transmittance of 72.4% and reflective in the near infrared (wavelength = 700-2000nm) with average reflectance of 67.0%.

TL;DR: In this paper, the non-radiative energy transfer process in zinc sodium phosphate glass system co-doped with samarium and europium ion has been examined under cw laser excitation.

TL;DR: In this article, a waveguide with Er3+ concentrations ranging from 0.01 to 4 mol% was prepared by sol-gel route and the waveguide was deposited on v-SiO2 and silica-on-silicon substrates, using dip-coating technique.

TL;DR: In this article, the optimal exposure and diffraction efficiency of succinic anhydride fulgide material for holographic recording media was investigated. But no photodegradation was detected after more than 450 writing-erasing cycles.

TL;DR: A series of charge transfer compounds determined as 1:1 stochiometric ratio by job method has been prepared with the interaction of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and anthracene, 9-methylanthracene and 9-bromanthracene in dichloromethane at room temperature as discussed by the authors.

TL;DR: In this article, a generalized Sellmeier formula was derived to describe the refractive indices for the whole composition range and a wide wavelength range of bismuth oxide and bic oxide.

TL;DR: In this paper, the optical properties and spectral behavior of as deposited and annealed thin films of ZnPc were studied using spectrophotometric measurements of the transmissivity and reflectivity at normal incidence of light in the wavelength range 200-2500nm.

TL;DR: In this paper, the effects of applied voltage and temperature on liquid crystal droplet morphology and its transmission characteristics were studied, and it was shown that threshold voltage and optical transmission increases with increasing temperature.

TL;DR: In this article, the authors give an overview of room-temperature up-conversion laser systems operating in the visible spectral region (VRSR) using a multi-pass pumping set-up.

TL;DR: In this paper, a simple coprecipitation method was used to synthesize nanometer-scale SnO2 nanoparticles and X-ray diffraction analysis showed that the diameter of the particles is 2.6 nm after heat treatment at 400 °C for 2 h.

TL;DR: In this article, a longitudinal pumped solid-state dye laser was established with a Q-switched Nd:YAG laser source and the lifetime of 60 000 pulses, 50 GJ/mol in normalized photostability, was obtained for the pyrromethene 567 doped in MTES-derived organically modified silicates (ORMOSILs) with the net sample thickness of 4 mm when its output energy declined to 50% of its initial value.

TL;DR: In this paper, the authors proposed to use NLO crystals in the deep and vacuum-ultraviolet (DUV and VUV) spectral region for many applications, such as high-resolution photo emission spectroscopy, precision processing and micro-machining.

TL;DR: In this article, the properties of vanadium pentoxide (V2O5) films deposited by r.f. reactive sputtering from the target are investigated, in particular the composition and structure of these films are analysed by Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS) and X-Ray diffraction (XRD) together with their electrochromic properties.

TL;DR: In this paper, the effects of concentration of Er3+ ions in tellurite glasses on the decay time, spectral width and weighted spectral peak were studied, and it was found that the upconversion efficiency goes up with the increasing concentration of the Er 3+ ions.

TL;DR: In this paper, the Sydney Opera House and a series of woodpile-type photonic crystals were fabricated using two-photon photopolymerization of inorganic-organic hybrid materials, which allowed the generation of complex-shaped three-dimensional microstructures at submicrometer resolution of structural elements.

TL;DR: In this paper, the electrical and optical properties of these films have been investigated as a function of dopant concentration, which was varied between 0 and 10 mol% of antimony.

TL;DR: In this article, the spectroscopic properties of bismuth borate glasses doped with 0.1 and 0.5 mol% Er2O3 are investigated and the results indicate the potentiality of the Er3+ ions doped glasses as laser and fiber amplifier media.

TL;DR: In this article, composites of zinc oxide (ZnO) nanoparticles in silica matrix can be produced by initially synthesizing a ZnO colloid, mixed with tetraethoxysilane (TEOS), followed by spray drying, to produce powder comprised of submicrometer sized particles.

TL;DR: In this article, the linear and nonlinear optical properties of the quaternary semiconductor AgGaGeS 4 having orthorhombic symmetry were analyzed and a solid solution in the system Ag x Ga x Ge 1− x S 2 with x = 0.5.

TL;DR: In this article, a series of fluorine modified silicate glasses are reported and their measured spectroscopic and physical properties are compared and compared with the data available in the literature.

TL;DR: Mg x Zn 1− x O particles were synthesized by the sol-gel technique using acetate of zinc and magnesium in a homogeneous aqueous reaction medium as discussed by the authors.

TL;DR: In this article, trivalent ions doped KAP:M +3 (M = Fe 3+, Cr 3+ ) ions were grown using solution growth technique. Optical and electro-optical characterisations on the coefficient r 51 were carried out.

TL;DR: In this article, thin Ag films with the thickness of 80 Angstrom were prepared by pulsed laser deposition technique and the inherent third-order nonlinear optical responses coming from the silver material itself were determined by z-scan method at the wavelength of 532 nm with laser duration of 10 ns.

TL;DR: In this paper, the average grain sizes of Tb 3+ :Y 3 Al 5 O 12 powders have been determined by X-ray powder diffraction measurements and the concentration dependence of the luminescence spectra and lifetimes have been investigated as a function of the YAG grains sizes.

TL;DR: In this paper, a strong monochromatic green emission located at 490 nm has been observed when excited with 300 nm light at room temperature (RT) in polycrystalline ZnO films with hexagonal structure.

TL;DR: In this paper, the formation process, the structure as well as the microstructure of the materials were analyzed by means of X-ray diffraction (XRD), thermal analysis (TG-TDA), infrared spectroscopy (IR) and scanning electron microscopy (SEM).