Lisinski, Susanne and Schaniel, Dominik and Ratke, Lorenz and Woike, Theo (2007) Mixed oxide xerogels based on titania or silica with non-linear optical properties. In: 2007 14. International Sol-Gel Conference (14), p. 521. 14. International Sol-Gel Conference, 2007-02-09 - 2007-07-09, Montpellier, Frankreich.
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Abstract
Much effort has been devoted to the development of materials, which exhibit nonlinear optical properties [1]. Nonlinear optical properties, especially frequency doubling, are only observed in materials with a non-centrosymmetrical crystal structure, like LiTaO3, LiNbO3 and KNbO3. The second harmonic generation effect of single crystals is well studied [2]. Lithiumtantalate is an interesting material for optical devices, because of the large electro-optic and nonlinear coefficients. Most studies are concentrated on the growth and properties of LiTaO3 single crystals, but the second harmonic generation effect of pure LiTaO3-xerogels and mixed SiO2-TiO2-LiTaO3-xerogels has not been investigated so far. We demonstrate the second harmonic generation effect on mixed oxide xerogels. SiO2- and TiO2-xerogel materials are prepared by the sol-gel process from two steps. The first step is the hydrolysis of tetra-ethylorthosilicate (TEOS) or tetra-n-butylorthotitanate (TBOT) with water, alcohol and a catalyst for pure titanium dioxide or silica dioxide xerogels [3,4]. The second step is heat treatment after gelation and ambient drying. Lithiumtantalate xerogels are synthesized by dissolving lithium ethoxide (LiEO) and tantalum ethoxide (TaEO) in ethanol under acidic conditions [5]. Mixed oxide xerogels from silica, titania and lithium-/ tantalum-ethoxide are prepared from TEOS, TBOT, LiEO and TaEO with different molar ratios. The mixed solution forms a gel after four hours. These wet gels are dried at 50°C for two days. Finally, the dried materials are heat treated at 500°C and 700°C. The as-prepared xerogel-materials exhibit frequency doubling (second harmonic generation, SHG), which was demonstrated with infrared light of 1064nm. [1] Xu, Y.: Ferroelectric materials and their applications. North-Holland, Amsterdam (1991) [2] Günter, P.: Nonlinear Optical Effects and Materials. Springer, Berlin (1999) [3] Hüsing, N., Schubert, U.:Aerogele - luftige Materialien: Chemie, Struktur und Eigenschaften. Angewandte Chemie Int. Ed. vol. 37, p. 23 (1998) [4] Pierre, A.C., Pajonk, G.M.: Chemistry of Aerogels and Their Applications. Chem. Rev. vol. 102, p. 4243 (2002) [5] Ono, S., Hirano, S.: Processing of highly oriented lithium tantalite films by chemical solution deposition. J. Mater. Res. vol. 10, p.2532 (2002)
Item URL in elib: | https://elib.dlr.de/51523/ | ||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||||||||||
Title: | Mixed oxide xerogels based on titania or silica with non-linear optical properties | ||||||||||||||||||||
Authors: |
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Date: | September 2007 | ||||||||||||||||||||
Journal or Publication Title: | 2007 14. International Sol-Gel Conference | ||||||||||||||||||||
Refereed publication: | No | ||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||
Page Range: | p. 521 | ||||||||||||||||||||
Keywords: | Sol-Gel, Harmonic Generation, SHG, Xerogel | ||||||||||||||||||||
Event Title: | 14. International Sol-Gel Conference | ||||||||||||||||||||
Event Location: | Montpellier, Frankreich | ||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||
Event Start Date: | 9 February 2007 | ||||||||||||||||||||
Event End Date: | 9 July 2007 | ||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||||||||||
HGF - Program: | Space (old) | ||||||||||||||||||||
HGF - Program Themes: | W FR - Forschung unter Weltraumbedingungen (old) | ||||||||||||||||||||
DLR - Research area: | Space | ||||||||||||||||||||
DLR - Program: | W FR - Forschung unter Weltraumbedingungen | ||||||||||||||||||||
DLR - Research theme (Project): | W - Vorhaben Materialwissenschaftliche Forschung (old) | ||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||||||||||
Deposited By: | Lisinski, Susanne | ||||||||||||||||||||
Deposited On: | 16 Oct 2007 | ||||||||||||||||||||
Last Modified: | 24 Apr 2024 19:14 |
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