Evidence of different β-phases in highly protonated z-cut H:LiNbO3 waveguides by raman scattering

Savatinova, I; Tonchev, S; Liarokapis, E; Armenise, MN; Armenise, M

dc.contributor.author	Savatinova, I	en
dc.contributor.author	Tonchev, S	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Armenise, MN	en
dc.contributor.author	Armenise, M	en
dc.date.accessioned	2014-03-01T01:48:35Z
dc.date.available	2014-03-01T01:48:35Z
dc.date.issued	1999	en
dc.identifier.issn	09478396	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25522
dc.subject.other	Annealing	en
dc.subject.other	Band structure	en
dc.subject.other	Cooling	en
dc.subject.other	High temperature effects	en
dc.subject.other	Lithium niobate	en
dc.subject.other	Phase composition	en
dc.subject.other	Phase transitions	en
dc.subject.other	Protons	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Phase modifications	en
dc.subject.other	Raman measurement	en
dc.subject.other	Lithium compounds	en
dc.title	Evidence of different β-phases in highly protonated z-cut H:LiNbO3 waveguides by raman scattering	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s003390050929	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s003390050929	en
heal.publicationDate	1999	en
heal.abstract	In this paper, evidence of different β-phases in highly protonated z-cut H:LiNbO3 waveguides is demonstrated by the Raman scattering technique. Multimode waveguides have been produced by using pyrophosphoric, benzoic, and diluted benzoic acids as a proton source. The proton-exchanged (PE) layers are subjected to annealing (APE samples) with different rates of cooling: slow (s) and quick (q). The effect of Li-H replacing is considered in the frequency range below 800 cm-1 and about 3500 cm-1 (OH modes). The analysis of the spectral data leads to some important conclusions about the changes in the H:LiNbO3 lattice. We demonstrate that applying (s) ↔ (q) procedures on HxLi1-xNbO3 waveguides with x > 0.56 leads to phase transitions between different states. The high temperature phase modifications (metastable at room temperature) are characterized by strongly broadened q-Raman bands which imply a high degree of disorder. Although the Raman measurements support the presence of different phases in H:LiNbO3 waveguides, some conclusions, different from those reported elsewhere, have been made.	en
heal.publisher	Springer-Verlag GmbH & Company KG, Berlin, Germany	en
heal.journalName	Applied Physics A: Materials Science and Processing	en
dc.identifier.doi	10.1007/s003390050929	en
dc.identifier.volume	68	en
dc.identifier.issue	4	en
dc.identifier.spage	483	en
dc.identifier.epage	487	en