Spatio-temporal ultrafast laser tailoring for bulk functionalization of transparent materials
type: Dataset
description: In the past decade, ultrashort laser sources have had a decisive impact on material processing for photonic applications. The technique is usually restricted to the elemental association of an ultrashort source with a focusing lens. It is thus limited in the achievable bulk modifications. Accompanying studies of material modifications in space and time, we propose here that automated spatio-temporal tailoring of the laser pulses is an efficient manner to overcome these limitations. More precisely, we demonstrate the generation of multiple processing foci for synchronous photomachining of multiple devices in the bulk. Thus, we report on the parallel photowriting of waveguides, light couplers, light dividers in 2D/3D in fused silica glass. We show that the domain of photowriting can be extended to deep focusing. We indicate that this can be achieved by wavefront shaping or temporal profile tailoring conducted by an evolutionary optimization loop. We also have unveiled a singular interaction regime where regular structuring takes place before the focal region. For the first time, the dynamics of the energy coupling to the glassy matrix is evaluated for various temporal pulse profiles. Enhanced energy confinement in the case of picosecond pulses is confirmed by characterization of the transient electronic gas and of the subsequent pressure. These pump-probe studies were carried out with a self-build time-resolved microscopy system with temporally shaped pump irradiation. We also developed a new method based on the Drude model to differentiate the electronic and matrix contributions to the contrast of the microscopy images.
identifier: NNT: 2010STET4001
issued: 2026-05-27T18:57:49.190111
language: en
modified: 2026-05-27T18:57:49.190116
contact point: Organization
  fn: CCSD
keyword: bulk-machining
keyword: glass
keyword: guide-dondes
keyword: infoeu-reposemanticsdoctoralthesis
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: spatial-shaping
keyword: temporal-shaping
keyword: theses
keyword: ultrafast-laser
keyword: verre
keyword: waveguide
landing page: https://theses.hal.science/tel-00488647

Spatio-temporal ultrafast laser tailoring for bulk functionalization of transparent materials
type: Distribution
format: HTML
issued: 2026-05-27T18:57:49.204289
modified: 2026-05-27T18:57:49.151175
access URL: https://theses.hal.science/tel-00488647

test_moissonnage_selune
type: Agent