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

Journal Article · Mon Apr 20 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4918808· OSTI ID:22398921

Truong, Lo Nhat; Fargin, Evelyne; Vigouroux, Hélène; Fargues, Alexandre ^[1]; Dussauze, Marc; Adamietz, Frédéric; Rodriguez, Vincent ^[2]; Santos, Luis ^[3]

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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)

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.

• OSTI ID: 22398921
• Journal Information: Applied Physics Letters, Vol. 106, Issue 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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