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Yves Bellouard

Cette personne a quitté l’EPFL

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Publications associées (69)

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Non-contact sub-nanometer optical repositioning using femtosecond lasers

Yves Bellouard

Optical components like resonator or waveguides often have stringent requirements in term of positioning accuracy during packaging. While this can be done routinely in a laboratory environment, permanently positioning and aligning optical elements with nan ...

Optical Society of America2015

Femtosecond laser-based production of 3D micro- and nano-devices in transparent substrate: a step toward system-materials

Yves Bellouard

Femtosecond laser irradiation applied to Fused Silica (the amorphous form of SiO2) defines a novel technology platform for highly integrated all-optical microsystems and beyond. In contrast with common approaches that rely on combining materials to achieve ...

Spie-Int Soc Optical Engineering2015

Sub-wavelength femtosecond laser based nanostructuring of complex patterns in the bulk of fused silica

Manuel Deckart, Yves Bellouard, Pieter Vlugter, Ernesto Gribaudo

Laser-inscribing arbitrary patterns with a sub-wavelength resolution in the bulk of transparent materials is of great importance for enabling reliable and versatile nano-manufacturing. Here, we propose a seeding-writing near-field enhancement based method ...

Optica Publishing Group2025

Local tuning of fused silica thermal expansion coefficient using femtosecond laser

Yves Bellouard, Pieter Vlugter, Erica Kathleen Block

Femtosecond laser exposure of fused silica in the nonablative regime can lead to various localized bulk modifications of the material structure. In this paper, we show that these laser-induced modifications can be used to tune silica thermal expansion prop ...

2019

Femtosecond laser-shockwave induced densification in fused silica

Yves Bellouard, Pieter Vlugter, Arunkrishnan Radhakrishnan, Julien Gilles Edgar Gateau

A tightly focused femtosecond laser-beam in the non-ablative regime can induce a shockwave sufficiently intense to reach local pressures in the giga-Pascal range or more. In a single beam configuration, the location of the highest-pressure zone is nested w ...

2022

Small-scale metal castings, small-scale metal/transparent composite structures and process to produce same

Andreas Mortensen, Yves Bellouard, Raphaël Charvet, Cyril Henri Dénéréaz

The method comprises at least the following steps: - exposing a substrate to focused laser irradiation at a preselected series of locations that trace a subset of the substrate volume that is connected to the surface of the substrate; some subsets of subst ...

2017

Femtosecond laser direct-write waveplates based on stress-induced birefringence

Yves Bellouard, Christos Edouardos Athanasiou, Benjamin Wesley Mc Millen

The use of femtosecond lasers to introduce controlled stress states has recently been demonstrated in silica glass. We use this technique, in combination with chemical etching, to generate and control stress-induced birefringence over a well-defined region ...

Optical Soc Amer2016

Substrate comprising slots for holding optical components of a laser cavity

Yves Bellouard, Saood Ibni Nazir, Antoine Maxime Delgoffe

In a substrate (1) for holding a multitude of components (6.1, 6.2, 6.3, 6.4, 6.5, 6.6) of an optical laser cavity, wherein the substrate (1) comprises a multitude of slots (2.1, 2.2, 2.3, 2.4, 2.5, 2.6), wherein each slot (2.1, 2.2, 2.3, 2.4, 2.5, 2.6) is ...

2024

On the Use of UV Femtosecond Pulses to Write Waveguides in Fused Silica

Yves Bellouard, Lisa Jutta Ackermann

Ultraviolet (UV) pulses at 450 fs are a powerful tool for femtosecond laser waveguide writing in fused silica. Whereas typically sub-200 fs pulses at a high exposure dose were required, UV light efficiently creates waveguides with propagation losses below ...

IEEE2025

Combination of additive and subtractive laser 3D microprocessing in hybrid glass/polymer microsystems for chemical sensing applications

Matthieu Ludovic Perrenoud, Yves Bellouard, Matthieu Perrenoud

We present a novel hybrid glass-polymer micromechanical sensor by combining two femtosecond laser direct writing processes: laser illumination followed by chemical etching of glass and two-photon polymerization. This incorporation of techniques demonstrate ...

Optical Society of America2017

Non-volatile data storage medium and system

Martin Vetterli, Yves Bellouard, Ruben Ricca

A data storage medium (2) comprising a stacked plurality of layers (9), each layer composed of a layer material selected from a group comprising at least two different dielectric materials, adjacent layers being formed of different materials, and at least ...

2023

Multi-spectral image priniting method

Martin Vetterli, Yves Bellouard, Adam James Scholefield, Gilles Baechler, Michalina Wanda Pacholska, Arnaud Latty

The present disclosure concerns a multi-spectral image printing method. The method includes the steps of: - providing a multi-spectral image; - providing a material; - determining changes in a refractive index value of the material permitting to reproduce ...

2019

Optical arrangement

Yves Bellouard, Sargis Hakobyan

In an optical arrangement (A) for use in an optical circuit, wherein the optical arrangement (A) comprises a substrate plate (1), wherein the substrate plate (1) is configured to receive a multitude of optical components (12.2, 12.5), the substrate plate ( ...

2021

Contactless Optical Packaging Concept for Laser to Fiber Coupling

Yves Bellouard, Saood Ibni Nazir

A novel method for the laser to fiber coupling is presented in which coarse alignment is achieved through micromachined v-grooves and mirrors in a fused silica substrate. Furthermore, fine repositioning is done in a noncontact manner by using a femtosecond ...

2021

Design of a miniature laser scanning head for high-bandwidth, low-amplitude beam steering

Yves Bellouard, Reymond Clavel

In laser micro-manufacturing, one of the challenges is to achieve fast scanning speed for fast fabrication of complex 3D microstructures. For microstructures with nanoscale features, it is often desirable to steer laser beams from a few microns to a few te ...

2012

Self-organised UV Femtosecond Laser Induced Modifications in the Bulk of Fused Silica

Yves Bellouard, Ernesto Gribaudo

By focusing a femtosecond laser beam in the bulk of a transparent material one can locally change the physical properties of the material itself. The interaction between NIR pulses and fused silica has been extensively studied in the past, showing how vari ...

IEEE2025

3D metal freeform micromanufacturing

Andreas Mortensen, Yves Bellouard, Raphaël Charvet, Léa Deillon, Fatmah Ebrahim, Tao Yang, Luciano Borasi, Enrico Casamenti, Cyril Henri Dénéréaz, Sacha Jérémy Florentin Pollonghini

Despite remarkable progress made in recent years, producing freeform three-dimensional micro-components out of copper, silver or gold and their alloys remains an engineering challenge: current processes are either too slow to be economically viable, or pro ...

2021

Laser-assisted morphing of complex three dimensional objects

Yves Bellouard, Jakub Drs

Morphing commonly refers to the smooth transition from a specific shape into another one, in which the initial and final shapes can be significantly different. In this study, we show that the concept of morphing applied to laser micro-manufacturing offers ...

Spie-Int Soc Optical Engineering2016

Single-Layer Subwavelength Femtosecond-Laser-Induced Confined Nanocrystallization in Multistack Dielectrics

Yves Bellouard, Ruben Ricca

We demonstrate extreme laser-induced modification confinement in a stack of dielectric layers, along the optical axis, without the use of tight focusing. Specifically, we show that an aperiodic distribution of layer thicknesses can effectively lead to the ...

American Physical Society (APS)2023

Survival of nanogratings in high melting oxide glasses upon thermal annealing

Yves Bellouard, Gözden Torun

Nanogratings were fabricated using a fs-laser inside more than 20 oxide glasses. Glass viscosity mostly dictates their thermal stability but deviation from this trend was observed in glasses containing large amount of Al2O3 or ZrO2. ...

Optical Society of America2024