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

Martinez Maestro, L; Rodenas, A; Ramirez, M O; Torchia, G A; Roso, L; Chen, F; Jaque, D

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.

Citation

Nd3+:MgO:LiNbO3 optical waveguides. Journal of Applied Physics, 106(1), https://doi.org/10.1063/1.3168432

• Journal Article Type: Article
• Acceptance Date: Jun 1, 2009
• Online Publication Date: Jul 15, 2009
• Publication Date: Jul 15, 2009
• Deposit Date: Dec 3, 2019
• Publicly Available Date: Dec 3, 2019
• Journal: Journal of Applied Physics
• Print ISSN: 0021-8979
• Electronic ISSN: 1089-7550
• Publisher: AIP Publishing
• Volume: 106
• Issue: 1
• DOI: https://doi.org/10.1063/1.3168432
• Publisher URL: https://doi.org/10.1063/1.3168432
• Related Public URLs: https://aip.scitation.org/journal/jap
• Additional Information: Funders : Universidad Autónoma de Madrid;Comunidad Autonoma de Madrid;Spanish Ministerio de Educacion y Ciencia; Projects : CCG07-UAM/MAT-1861