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Frequency doubling xerogels with ferroelectric particles

Lisinski, Susanne und Schaniel, Dominik und Ratke, Lorenz und Woike, Theo (2007) Frequency doubling xerogels with ferroelectric particles. In: 2007 14. International Sol-Gel Conference, 14, Seite 520. 2007 14. International Sol-Gel Conference, 2007-02-09 - 2007-07-09, Montpellier, Frankreich.

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Nonlinear optical single crystals are exploited for electro-optic, piezoelectric and pyroelectric devices [1]. The most commonly used nonlinear optical effects are second order: frequency doubling (second harmonic generation, SHG). LiNbO3 and KNbO3 single crystals are suitable frequency doublers under phase-matching conditions. Because of the time-consuming growth and the complex phase-matching of single crystals a new field of research has been established in the last decade: the new focus is on random materials, which are useful for optical applications [2,3]. We synthesized new functional SiO2 and TiO2 xerogels with nonlinear optical properties by incorporation of nano to micron sized particles of ferroelectric character. The silica and titiania wet gels are prepared by a sol-gel technique with TEOS (tetra-ethylorthosilicate) and TBOT (tetra-butylorthotitanate) as precursors [4,5]. A special ambient drying method was developed to produce crack-free highly transparent xerogels. Ferroelectric particles, such as BaTiO3, KNbO3, LiNbO3, LiTaO3, having sizes of around 100 nm up to 1 µm are embedded into the transparent matrix before the colloidal formation and gelation starts [6]. We observed frequency doubling at an incident wavelength of 1064nm and the possibility to continuously modify the refractive index of the xerogels over a wide range from 1.2 to 2.1. The refractive index matching is important to avoid light scattering and reduce the turbidity of the compound xerogels. [1] Günter, P.: Nonlinear Optical Effects and Materials. Springer, Berlin (1999) [2] Skipetrov, S. E.: Disorder is the new order. Nature vol. 432, p. 285 (2004) [3] Wiersma, D. S., Cavalieri, S.: A temperature-tunable random laser. Nature vol. 414, p. 708 (2001) [4] Hüsing, N., Schubert, U.:Aerogele - luftige Materialien: Chemie, Struktur und Eigenschaften. Angewandte Chemie Int. Ed. vol. 37, p. 23 (1998) [5] Pierre, A.C., Pajonk, G.M.: Chemistry of Aerogels and Their Applications. Chem. Rev. vol. 102, p. 4243 (2002) [6] Lisinski, S., Schaniel, D., Ratke, L., Woike, Th.: Second-Harmonic Generation by Ferroelectric Microparticles in Aerogels. Chemistry of Materials vol. 18, p. 1534 (2006)

Dokumentart:Konferenzbeitrag (Poster)
Titel:Frequency doubling xerogels with ferroelectric particles
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Schaniel, DominikUniversität zu KölnNICHT SPEZIFIZIERT
Woike, TheoUniversität zu KölnNICHT SPEZIFIZIERT
Datum:September 2007
Erschienen in:2007 14. International Sol-Gel Conference
Referierte Publikation:Nein
In Open Access:Nein
In ISI Web of Science:Nein
Seitenbereich:Seite 520
Stichwörter:Sol-Gel, Xerogel, Harmonic Generation, SHG
Veranstaltungstitel:2007 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: Lisinski, Susanne
Hinterlegt am:16 Okt 2007
Letzte Änderung:27 Apr 2009 14:25

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