elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Mixed oxide xerogels based on titania or silica with non-linear optical properties

Lisinski, Susanne und Schaniel, Dominik und Ratke, Lorenz und Woike, Theo (2007) Mixed oxide xerogels based on titania or silica with non-linear optical properties. In: 2007 14. International Sol-Gel Conference (14), Seite 521. 14. International Sol-Gel Conference, 2007-02-09 - 2007-07-09, Montpellier, Frankreich.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

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)

Dokumentart:Konferenzbeitrag (Poster)
Titel:Mixed oxide xerogels based on titania or silica with non-linear optical properties
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Lisinski, SusanneNICHT SPEZIFIZIERT
Schaniel, DominikUniversität zu Köln
Ratke, LorenzNICHT SPEZIFIZIERT
Woike, TheoUniversität zu Köln
Datum:September 2007
Erschienen in:2007 14. International Sol-Gel Conference
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seite 521
Stichwörter:Sol-Gel, Harmonic Generation, SHG, Xerogel
Veranstaltungstitel:14. International Sol-Gel Conference
Veranstaltungsort:Montpellier, Frankreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-02-09 - 2007-07-09
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialwissenschaftliche Forschung (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Susanne Lisinski
Hinterlegt am:16 Okt 2007
Letzte Änderung:27 Apr 2009 14:25

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.