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Title: Isotropic octupolar second harmonic generation response in LaBGeO{sub 5} glass-ceramic with spherulitic precipitation

A spherulitic crystallization of the crystalline phase LaBGeO{sub 5} is generated in the 25La{sub 2}O{sub 3}-25B{sub 2}O{sub 3}-50 GeO{sub 2} glass system. Linear and nonlinear optical properties of lanthanum borogermanate glass-ceramic have been investigated at both macroscopic and microscopic scales. Polarized μ-Raman analysis has evidenced a radial distribution of the crystallites along the c-axis inside spherulites, whereas polarized μ-Second Harmonic Generation (SHG) analysis revealed intensity maxima perpendicularly to the c-axis crystallites orientation. Polarized SHG mapping of a spherulite indicate that no dipolar response along the c-axis oriented crystallites occurs despite the individual dipolar symmetry C{sub 3} of the crystallites. At a larger mm scale, the isotropic scattering of spherulites recorded from macroscopic SHG experiment in the forward direction is consistent with an average coherent octupolar response per spherulite. These SHG analyses at different scale are both in accordance with radial antiferroelectric orientation along the c-axis of crystallites inside each spherulite.
Authors:
; ; ;  [1] ; ; ;  [2] ;  [3]
  1. Univ. Bordeaux, ICMCB, CNRS UPR 9048, F-33600 Pessac (France)
  2. Univ. Bordeaux, ISM, CNRS UMR 5255, F-33405 Talence (France)
  3. Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, no. 1, Lisboa (Portugal)
Publication Date:
OSTI Identifier:
22398921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROELECTRIC MATERIALS; BORON COMPOUNDS; CERAMICS; CRYSTALLIZATION; GERMANATES; GERMANIUM OXIDES; GLASS; HARMONIC GENERATION; LANTHANUM COMPOUNDS; NONLINEAR PROBLEMS; OPTICAL PROPERTIES; ORIENTATION; PRECIPITATION; SCATTERING; SPATIAL DISTRIBUTION