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Two-layer waveguiding structure in LiNbO3 with birefringence reversal for refractive-index sensors with large measurement range

Zweischicht Wellenleiterstruktur in LiNbO3 mit Doppelbindung-Umkehr für Brechzahlsensoren mit einem großen Meßbereich
: Hinkov, I.; Hinkov, V.


Journal of Lightwave Technology 11 (1993), No.4, pp.554-559 : Abb.,Lit.
ISSN: 0733-8724
Journal Article
Fraunhofer IPM ()
Brechzahlensensoren; integrated optic; integrierte Optik; LiNbO3; polarisation interferometry; Polarisationsinterferometrie; refractive index sensors; two-layer structure; Zweischicht-Struktur

We have developed and investigated a novel two-layer structure in LiNbO3 fabricated with Ti-indiffusion and proton exchange. This structure is especially suitable for constructing refractive-index sensors with a large, up to 2.2, measurement range. Next to its high sensitivity this structure offers also some additional advantages like the possibility to optimize the sensitivity for a given measurand, the elimination of the necessity of buffer layers etc. The largely different sensitivities of the two fundamental TE0- and TM0-modes achieved allows the measurement and the reference channel to be incorporated in the same waveguide. In this way, a new type polarization interferometry can be introduced increasing the flexibility of the refractive-index sensors design.