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

Lisinski, Susanne and Schaniel, Dominik and Woike, Theo and Ratke, Lorenz (2007) Mixed oxide xerogels based on titania or silica with non-linear optical properties. In: 2007 Euromat. Euromat 2007, 2007-09-10 - 2007-09-13, Nürnberg, Deutschland.

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Abstract

We study the second harmonic generation effect (SHG) in transparent, nanosized xerogels prepared by the sol-gel method. The pure silica and titiania xerogels are synthesized by hydrolysis of TEOS (tetra-ethylorthosilicate) and TBOT (tetra-butylorthotitanate) as precursors under acidic conditions, followed by gelation of the sols and a special method of ambient drying. Lithiumtantalate xerogels start with a sol based on lithiumethoxid (LiEO) and tantalumethoxide (TaEO) dissolved in ethanol with the addition of acetic acid. The material is prepared under protective atmosphere in a glove box. Mixed oxide xerogels from silica, titania and lithiumtantalate are prepared from TEOS, TBOT, LiEO and TaEO with various ratios of the oxides. The dried samples are heat treated at 500 or 700°C. We observed in these mixed oxide xerogels frequency doubling properties and the possibility to modify continuously the refractive index of the xerogels over a wide range from 1.2 to 2.1. The paper presents the preparation methods and discusses the optical properties.

Document Type:Conference or Workshop Item (Speech)
Title:Mixed oxide xerogels based on titania or silica with non-linear optical properties
Authors:
AuthorsInstitution or Email of Authors
Lisinski, SusanneUNSPECIFIED
Schaniel, DominikUniversität zu Köln
Woike, TheoUniversität zu Köln
Ratke, LorenzUNSPECIFIED
Date:September 2007
Journal or Publication Title:2007 Euromat
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:SHG, Frequency conversion, Sol-Gel, Xerogel
Event Title:Euromat 2007
Event Location:Nürnberg, Deutschland
Event Type:international Conference
Event Dates:2007-09-10 - 2007-09-13
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: Susanne Lisinski
Deposited On:16 Oct 2007
Last Modified:27 Apr 2009 14:25

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