Glass Structure and Optical Nonlinearities in Thallium(I) Tellurium(IV) Oxide Glasses

• Published in: Journal of solid state chemistry Vol. 146; no. 2; pp. 329 - 335
• Main Authors: Jeansannetas, B., Blanchandin, S., Thomas, P., Marchet, P., Champarnaud-Mesjard, J.C., Merle-Méjean, T., Frit, B., Nazabal, V., Fargin, E., Le Flem, G., Martin, M.O., Bousquet, B., Canioni, L., Le Boiteux, S., Segonds, P., Sarger, L.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01-09-1999; Elsevier
• Subjects: Chemical Sciences; Condensed matter: structure, mechanical and thermal properties; Disordered solids; Engineering Sciences; Exact sciences and technology; Fundamental areas of phenomenology (including applications); glass structure; Glasses; Material chemistry; Materials; nonlinear index; Nonlinear optics; Optical susceptibility, hyperpolarizability; Optics; Physics; Structure of solids and liquids; crystallography; thallium(I) tellurite glasses; glass structure; thallium(I) tellurite glasses; nonlinear index; Raman spectra; Inorganic compounds; Tellurium IV Oxides; Ternary compounds; Refractive index; Transition element compounds; Glass; Experimental study; Tellurites; Thallium I Oxides; Optical properties; Property structure relationship; Nonlinear optics; Amorphous state structure; Hyperpolarization
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1999.8355

The relationships between structure and nonlinear optical response at 1.5 μm in thallium(I) tellurite glasses are investigated. Usually in tellurite glasses, the introduction of a modifier ion changes the basic structural TeO4 disphenoid entity progressively into a TeO3 trigonal bipyramid via an intermediate TeO3+1 polyhedron. This evolution leads to a decrease of the nonlinear refractive index n2. Nevertheless, if a modifier ion such as Tl+ also has an ns2 lone electron pair, n2 increases although the same structural evolution is observed around the tellurium atoms. This result is related to the hyperpolarizability of the thallium oxygen entities, which has been evidenced by the structural study of both thallium(I) tellurite crystals and glasses of the same compositions. With this solid state chemistry approach, the highest non-linear refractive index measured at 1.5 μm (n2=9.10−19 m2/W) and reported in oxide glasses has been obtained.