Optical, magneto-optical properties and fiber-drawing ability of tellurite glasses in the TeO2-ZnO-BaO ternary system

The presented work is focused on the optical and magneto-optical characterization of TeO2-ZnO-BaO (TZB) tellurite glasses. We investigated the refractive index and extinction coefficient dispersion by spectroscopic ellipsometry from ultraviolet, 0.193 um, up to mid infrared, 25 um spectral region. Studied glasses exhibited large values of linear (n632 = 1.91-2.09) and non-linear refractive index (n2 = 1.20-2.67x10-11 esu), Verdet constant (V632 = 22-33 radT-1m-1) and optical band gap energy (Eg = 3.7-4.1 eV). The materials characterization revealed that BaO substitution by ZnO leads (at constant content of TeO2) to an increase in linear and nonlinear refractive index as well as Verdet constant while the optical band gap energy decreases. Fiber drawing ability of TeO2-ZnO-BaO glassy system has been demonstrated on 60TeO2-20ZnO-20BaO glass with presented mid infrared attenuation coefficient. Specific parameters such as dispersion and single oscillator energy, Abbe number, and first-/ third-order optical susceptibility are enclosed together with the values of magneto-optic anomaly derived from the calculation of measured dispersion of the refractive index

An Ultra-Low Power 28nm FD-SOI Low Noise Amplifier based on Channel Aware Receiver System Analysis

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2-μm Brillouin laser based on infrared nonlinear glass fibers

International audienceInfrared fiber materials such as chalcogenide, tellurite, and heavily germanium-doped silica glasses are attractive materials for many applications based on nonlinear optical effects such as Kerr, Raman, and Brillouin processes. Here, we experimentally demonstrate a close-to-single-frequency Brillouin fiber laser in the 2-μm wavelength region either based on tellurite (TeO2) glass or on heavily germanium-doped silica glass. Our results reveal a strong enhancement of the Brillouin gain efficiency at 2 μm of more than 50 times that of standard silica opticalfibers. A lasing threshold and narrow linewidth of 98 mW and 48 kHz, respectively, have been demonstrated in the tellurite fiber-based laser. This simple Brillouin laser source configuration confirms the potential applications of such fibers for the development of nonlinear photonic devices in the important 2-μm spectral range

Brillouin fiber laser based in step-index tellurite (TeO2) optical fiber

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Experimental investigation of the U-Zr-Al ternary phase diagram: Isothermal sections at 673 K and 1073 K.

International audienceIsothermal sections at 673 K and 1073 K of the ternary U-Zr-Al system were established in the whole concn. range, by means of powder X-ray diffraction, SEM-energy dispersive X-ray spectroscopy and DTA. All measured compns. and unit-cell refinements were performed at room temp. from quenched samples annealed at 1073 K and 673 K for four and eight weeks resp. For both temps., the Al-rich corner of the phase diagram is characterized by extended homogeneity ranges due to mutual exchange between U and Zr in UAl3 (cubic, AuCu3-type) and in the Laves phase UAl2 (cubic, MgCu2-type). Minute U soly. in ZrAl2 (hexagonal, MgZn2-type) and in Zr2Al (hexagonal, Ni2In-type) was evaluated to be of the order of 1 at.% U. For the other binary compds., the soly. of the third component was found negligible. At 1073 K, the solid soln. based on γU (cubic, W-type) which covers the U-Zr binary axis up to 95.5 at.% Zr, allows also some limited soly. of Al [max. of 5 at.%]. For Al-content below 66 at.%, most of the phase relations comprise equil. between the Zr-Al binaries and the γ(U,Zr,Al) solid soln. At 673 K, the U-Zr axis is found in agreement with the literature data and no Al soly. could be detected in αU, αZr and UZr2 (δ phase). The phase relations are mainly established between Zr-Al binaries and αU. For monolithic UMo fuel with a Zr diffusion barrier foil cladded with Al, the main interaction product is expected to involve the U-based alloy with the Zr-Al binary compds. and the pseudo-binary U1-xZrxAl2 and U1-xZrxAl3 phases