A novel non-paraxial Time-Domain technique based on Pade approximant for modeling ultra short optical pulses has been formulated and tested. The new method is an extension to the parabolic Time-Domain Beam Propagation Method (TDBPM) that solves the time domain wave equation along one direction that allows the time window to follow the evolution of the pulse. In this work the technique was appli...

DRAGOMIR N. NESHEV∗, ANDREY A. SUKHORUKOV∗, WIESLAW KROLIKOWSKI† and YURI S. KIVSHAR∗,‡ ∗Nonlinear Physics Centre, Research School of Physical Sciences and Engineering, Centre for Ultra-high bandwidth Devices for Optical Systems (CUDOS), Australian National University, Canberra ACT 0200, Australia †Laser Physics Centre, Research School of Physical Sciences and Engineering, Centre for Ultra-high...

Temperature modulated differential scanning calorimetry measurements on Agy(GexSe1−x )1−y glasses provide evidence for bimodal glass transition temperatures in Se-rich glasses (x < 1/3). At x = 0.20 and 0.25, thermal measurements performed as a function of Ag content in the 0 y 0.25 range reveal that the additive (Ag) segregates into an Ag2Se-rich glass phase, possessing a characteristic glass ...

Second-order optical properties of thermally poled arsenicgermanium sulfide glasses have been investigated. Parallel studies of glass structure changes upon poling and/or visible cw-laser irradiation and complete SHG quantitative analysis have been performed. Key parameters and poling mechanisms influencing largely SHG stability and efficiency have been pointed out. ©2013 Optical Society of Ame...

The present paper reports the near infrared (NIR) emission spectra of Er: Yb co-doped SiO2-Al2O3-TiO2 sol-gel glasses. Upon optical pumping either with 980nm(Diode Laser) or 488nm (Ar ion laser), the NIR emission transition (I13/2→I15/2) at 1550nm of (Er:Yb) glasses have revealed an improved intensity by many times compared with the Er singly doped sol-gel glass. The dependence of the emission ...

We use plane-wave density functional methods to model Ge-Se-Ag-Cu liquids and glasses. The models are analyzed for structural and electronic properties and transition metal ion dynamics. Electronic properties are analyzed with the electronic density of states and projected density of states. The optical gap increases with increasing Ag content and decreases with increasing Cu content. We carry ...

Various Ge–As–Se glasses spanning a mean coordination number MCN from 2.2 to 2.94 have been investigated using differential scanning calorimetry and Raman spectroscopy. The glass transition temperature Tg was found to increase with increasing MCN, except for those glasses located within the nanoscale phase-separated region of the phase diagram. The evolution of Raman features at wavenumbers fro...

The colorimetry and thermoluminescence properties of gamma irradiated glass were reported in as early as 1920. The utility of radio-photoluminescence (RPL) of silver activated metaphosphate glass for monitoring high doses of accidental and routine gamma radiation was reported in the 1960s. Since then considerable amount of research work has been carried out to study the thermoluminescence (TL),...