Showing papers in "Optical Materials in 1993"

TL;DR: In this paper, the saturation of the optical absorption in V 3+ : YAG crystal is investigated and the absorption cross section of tetrahedral V 3 + at 1.08 μm is estimated to be 8.2±2.5x10 -18 cm 2.

TL;DR: In this paper, the Fraunhofer's method used to measure the refractive index of liquids has been modified using an electric circuit containing a sensitive photodiode in order to measure accurately the deviation angle of a HeNe laser beam.

TL;DR: In this article, the optical thickness of the overlayer is determined using the experimental ellipsometry parameters at long wavelengths, thereby increasing the accuracy of the optical functions determined from the data. And the results are compared with other results in the literature.

TL;DR: In this paper, the optical transmission was measured over the 0.3 to 2.0 μm spectral region in order to derive the refractive index and absorption coefficient of these Ag-photodoped chalcogenide films.

TL;DR: The absorption and emission properties of the 4f-5d transition of trivalent praseodymium in fluoride crystals have been characterized, including the CaF 2, SrF 2, LiYF 4 and BaY 2 F 8 hosts.

TL;DR: In this article, the authors applied the laser evaporation method on fabrication of CdTe-doped glasses for the first time, and measured the third-order nonlinear susceptibility χ(3) and the decay time τ of the glasses by three-beam forward type degenerate four-wave mixing.

TL;DR: In this paper, the second-order nonlinear optical properties of four-nitroaniline (p-NA), DADB, and TATB calculated using the Molecular Orbital Package (MOPAC) AM1 method were found to be 12.017×10-30, 6.793× 10-30 and -0.196×10 -30 esu, respectively.

TL;DR: In this article, the authors measured two-photon absorption over a wide spectral range in InAs and InSb utilizing the broad tunability of the free-electron laser (CLIO) at the Laboratoire pour l'Utilisation du Ravonnement Electromagnetique (LURE).

TL;DR: In this article, data on the optical response of amorphous carbon layers are presented and discussed in terms of parameters of commonly accepted dispersion models and absorption assumptions (Penn model, lorentzian oscillator model, Urbach edge, Tauc edge).

TL;DR: In this paper, the structural characteristic of silica porous glasses produced by etching of sodium-borosilicate substrates was investigated using absorption-desorption isotherm technique, optical and electrical microscopy, optical transmission and luminescence measurements.

TL;DR: In this paper, the authors investigated the optical nonlinearities in dye-doped cholesteric liquid crystals with laser-induced dynamic grating experiments using nanosecond and picosecond excitation pulses.

TL;DR: In this paper, the optical properties of thin semi-transparent ZrN films on glass were compared to opaque and thin ZrNs grown on single crystalline Si, and the measured optical constants in the relaxation region of the thin films were calculated using the Drude model.

TL;DR: In this article, the authors performed optical absorption measurements at the wavelength of 1.06 μm in very low-loss materials, using a photothermal deflection technique, and showed that the absorption coefficient of the present best optical silicas varies between 4.5 and 60 ppm cm -1.

TL;DR: In this paper, the decay time constants and gain coefficients of two nominally pure KTN crystals were investigated for different spatial frequencies and externally applied fields, and the experimental results can be described by a model which assumes one kind of photorefractive centers and takes into account electron-hole competition and space charge field limitations due to the available trap density.

TL;DR: In this paper, photo-induced gratings were written by 18 ps laser pulses in a new photorefractive material Bi 2 TeO 5, followed by delayed probe pulses out to 2 ns.

TL;DR: The mechanism of concentration quenching of the Er3+ emission in (La,Er)AlO3 is reported and discussed in this paper, which is consistent with the process of the cross-relaxation via an intermediate level.

TL;DR: In this paper, a Fabry-Perot modulator with a poled crosslinked polymer is described, and the corresponding electro-optic coefficients r13 and r33 are measured at 633 nm to be 11 pm/v and 36 pm/V, respectively.

TL;DR: In this paper, the nonlinear optical behavior of acridine orange dye has been studied in lead-tin-flouride glass and it was shown that this material possess nonlinear saturable absorption and power-dependent lifetimes, both on nanosecond time scale.

TL;DR: In this article, the up-conversion emission in Nd 3+ :ZBLAN and Er 3+, ZBLAN glasses were measured and it was shown that the energy transfer processes were the principal processes in these upconversion emissions.

TL;DR: In this paper, Nitrogenated amorphous carbon layers have been deposited by a dc plasma technique on silicon substrates and optical constants of the film material have been determined from spectrophotometric measurements in the MIR/NIR spectral ranges.

TL;DR: In this paper, the absorption, luminescence and excitation electronic spectra of MgSiO 3 doped with chromium were measured in the visible and near infrared regions at temperatures down to 10 K. All the spectral features were assigned and a preferred occupation of the low field sites was evidenced.

TL;DR: In this paper, the biexciton luminescence and optical gain due to CuCl quantum dots are presented for different confinement regimes under picosecond excitation at low temperature.

TL;DR: In this article, the optical constants, n and k, for calcium-aluminate glasses containing differing amounts of SiO2 were measured for use as an n < 1 hollow waveguide material at CO2 laser wavelengths.

TL;DR: In this article, the four-wave mixing (FWM) photorefractive response was investigated in pure and Fe-doped Bi12GeO20 (BGO) crystals and a significant difference was found in the temperature dependence of the FWM diffraction efficiency between the undoped BGO and BGO:Fe.

TL;DR: In this paper, a large number of potential donor ions D (D = Mn 2+, Dy 3+, Tb 3+, Eu 2+ and Eu 3+ ) are studied in the hexaaluminate host.

TL;DR: In this article, three major nonlinear optimal properties: nonlinear optical coefficient, absorption edge on ultraviolet side and birefringence, of urea crystal have been calculated in the structure-property study.

TL;DR: Wurtzite type epilayers of CdS and CdSe have been grown by hot-wall epitaxy and pulsed laser evaporation epitaxy on BaF2, SrF2 and GaAs substrates as mentioned in this paper.

TL;DR: In this paper, the self-focusing of continuous HeNe laser radiation in very recently available KNSBN: Ce crystal is investigated and the position dispersion curves of the crystal are given by using the z-scan method.

TL;DR: In this paper, the second harmonic intensity of the poled BaTiO 3 thin film was studied as a function of the incident fundamental polarization, showing that there was no in-plane symmetry in poled films.

TL;DR: In this article, the longitudinal heat relaxation in the multiple quantum well structure is determined from the measured lateral profile of the temperature, and a very good agreement between measured lateral profiles and theoretical simulations based on the calculated heat relaxation time in the integrated device is obtained.