ETD

Archivio digitale delle tesi discusse presso l'Università di Pisa

Tesi etd-03202019-134853


Tipo di tesi
Tesi di laurea magistrale
Autore
LOI, LAURA
URN
etd-03202019-134853
Titolo
Ultrafast laser inscription in silver-containing glasses: structure/property dependence for improved photosensitivity and modulated waveguides for photonics applications
Dipartimento
FISICA
Corso di studi
FISICA
Relatori
relatore Prof. Tonelli, Mauro
relatore Prof. Canioni, Lionel
relatore Prof. Petit, Yannick
Parole chiave
  • photosensitive glasses
  • laser inscription
  • direct laser writing
  • Bragg gratings
  • waveguide
Data inizio appello
10/04/2019
Consultabilità
Completa
Riassunto
Direct Laser Writing is based on multi-photon absorption, a nonlinear process characterised by a strong confinement on interaction voxel, which allows for 3D control of localised energy deposition and associated material modification.
In a photosensitive glass doped with silver ions, DLW can induce the nucleation of silver ions, leading to original properties such as clusters formation and associated linear and non linear optical properties.
Two main issues are addressed in this report. Firstly, in a new sodium-gallium-phosphate ternary diagram, the influence of the glass network on the interaction between the femtosecond laser and the material is analysed, in order to relate the photosensitivity to structural properties of the glassy matrix, depending on its composition. These developments show significant progress in the understanding and improvement of the silver photosensitivity under femtosecond laser irradiation, which is highly demanded to obtain more efficient laser-glass modification processes, as well as getting access to larger laser-induced optical contrasts.
Secondly, having proved the ability of creating new kind of waveguiding structures, sustained by the localised creation of new silver species with larger polarisability, modulated waveguides are designed and produced. Such structures are supposed to enable selective spectral reflectivity for specific wavelengths for developing waveguide Bragg gratings.
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