Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides

Martinez Maestro, L ORCID: https://orcid.org/0000-0001-6629-5313, Rodenas, A, Ramirez, M O, Torchia, G A, Roso, L, Chen, F and Jaque, D 2009, 'Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides' , Journal of Applied Physics, 106 (1) .

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Abstract

We report on the fabrication and microspectroscopy imaging of femtosecond laser written double-filament based Nd3+ :MgO:LiNbO3 optical waveguides. The waveguiding high refractive-index regions are identified by blueshifts of the Nd3+ ion fluorescence lines with no deterioration in the fluorescence efficiency, whereas filamentary low-index regions are identified by both a Nd3+ line redshift and a fluorescence efficiency reduction. The lattice structural micromodifications at the origin of both waveguide formation and Nd3+ fluorescence changes have been investigated by means of confocal micro-Raman experiments. We have found that the direct laser written filaments are mainly constituted by a large density of defects, together with a marked axial compression perpendicular to the filaments �along the optical c-axis�. Conversely, the high-index waveguiding regions are characterized by a pronounced anisotropic dilatation of the LiNbO3 lattice xy-planes.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of Applied Physics
Publisher: AIP Publishing
ISSN: 0021-8979
Related URLs:
Funders: Universidad Autónoma de Madrid, Comunidad Autonoma de Madrid, Spanish Ministerio de Educacion y Ciencia
Depositing User: L Martinez Maestro
Date Deposited: 03 Dec 2019 14:07
Last Modified: 03 Dec 2019 14:15
URI: http://usir.salford.ac.uk/id/eprint/53366

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