Novel glasses based on TeO2-P2O5-ZnO-MxOy-PbF2 doped by rare earths for laser operated optical anisotropy are proposed. We have discovered an increase of birefringence within coherent laser densities within the 200...500 MW/cm2 power densities up to 5×10-5. After it is enhanced more slowly and is saturated after 800 MW/cm2. The glasses have been treated by two bicolour laser beams which propagated under the incident angles varying within the 22…25 degree for 45 degree light polarization. The photoinducing beam have been formed by the 10 ns Nd:YAG laser with 10 Hz frequency repetition. The set of polarizers, lenses and mirrors have been used for formation of the photo inducing laser beams with the desired parameters. The all investigated glasses in temperature interval within the 20°C up to 300°C show the same mechanism of electric charge transport. We have discovered that the glasses possess a high thermostability with the small exception for the first two cycles of heating-cooling and for all the glasses for the third and higher cycling. Addition of rare earth elements has not a huge influence on their stability. The maximal changes are observed for TiO2 containing compounds, the middle one – for ZnO and the lowest for WO3. The laser operation has been performed by simultaneous treatment by two bicolor coherent beams. The relaxation processes are equal to about several minutes. Here principal role play polarizabilities of the Ti ions which are maximal and the relatively higher atomic radiuses for Zn and W. The obtained glasses may be promising for laser stimulated fibers during transmission of optical information.
The tellurite-tungstate glasses containing small amounts of rare-earth ions have been studied experimentally at 77 and
293 K using spectroscopic methods. The photoluminescence (PL) studies reveal the emission of efficient green-yellow
light from Tb3+ ions and red light from Eu3+ ions. The Judd-Ofelt intensity parameters have been derived for Nd3+ and
Er3+ ions from the absorption spectra and they have used to calculate the radiative lifetimes and branching ratios. The
quantum efficiency η = 0.95 of the 4F3/2 level of Nd3+ ion is higher than the typical value of other tellurite-based glasses.
For Er3+ ions, PL originating from the 4S3/2,4I11/2 and
4I13/2 levels has been observed and the luminescence decay of the
first two levels has been found to be governed by radiative transitions and multiphonon relaxation involving the highest
energy of Te-O vibrations.
The goal of this work was to investigate the influence of ZnO on physico-chemical properties of tellurite glasses of the
TeO2-ZnO-PbO-La2O3 system, including those doped with Yb3+. The effect of glass crystallization on the thermal
stability and crystallizing phases formed upon the heat treatment were investigated by DTA/DSC/, XRD and
microscopic methods. The spectral dependence of ellipsometric angles of the tellurite glass samples, have been studied.
The influence of ZnO and Yb3+ ion, onto changes of refractive index of tellurite glass (without RE admixture) were
examined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer, in spectral range
of 190-1700 nm. Based on obtained results it can be concluded, that admixtures of ZnO have the most considerable
influence on thermal stability tellurite glasses raise.
Technology of tellurite glasses from the TeO2-WO3-PbO-La2O3 has been investigated. The effect of lanthanum oxide content on tendency to the crystallization of glassy matrix has been studied. Differential thermal analysis DTA/DSC, XRD measurement have been considered in term of lanthanum oxide influence. The refractive indices (n) for series of glass compositions with various La2O3 contents compared with glass without La2O3 addition has been measured. From obtain results it has been stated that the refractive index slightly increases with the addition of the lanthanum oxides in all glass of compositions. Double crucible drawing technique was applied to drown tellurite optical fibre with high numerical aperture (0.8).
Technology of tellurite glasses from the TeO2-WO3-PbO system rare earth doped has been investigated. This kind of materials possess high transparency in the visible and IR spectral range (up to 6&mgr;m) and low dispersion. Because of introduction of rare earth into glass structure, obtained materials possess very good properties such as: luminescence, high refractive index (higher than 2.0), which is a consequence of high polarizability of tellurium ions. Addition of lanthanum fluoride into glass structure from the TeO2-WO3-PbO system change the tendency to crystallization. The effects of the crystallization of glasses from the TeO2-WO3-PbO system LaF3 and other rare earths doped were a subject of the study. Differential thermal analysis, XRD, SEM measurements have been considered in term of rare earth influence. Particular interest present rare earth doped materials. This is caused by their relatively large radius compared to the other compounds as well due to specific luminescent properties of the rare earth ions. In the present work the data concerning the influence of the rare earth on the emission properties of glasses has been presented.
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