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Yves Bellouard

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Publications associées (73)

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

Yves Bellouard, Christos Edouardos Athanasiou

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

Investigation of the micro-mechanical properties of femtosecond laser-induced phases in amorphous silica

Yves Bellouard, Christos Edouardos Athanasiou

Femtosecond pulses used in the regime where self-organized patterns are found have two noticeable effects in amorphous silica's (a-SiO2) optical and chemical properties: The decrease of the material's refractive index as well as an enhanced etching selecti ...

Spie-Int Soc Optical Engineering2016

Formation of nanogratings in a porous glass immersed in water by femtosecond laser irradiation

Yves Bellouard, Min Huang, Ya Cheng

Irradiation of intense ultrafast laser pulses in glasses can lead to formation of nanogratings whose periods are significantly smaller than the incident irradiation wavelength. The mechanism of the exotic phenomenon is still under hot debate. Here, we acce ...

2015

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

Monolithic transparent 3D dielectrophoretic micro-actuator fabricated by femtosecond laser

Yves Bellouard, Tao Yang

We demonstrate a three-dimensional (3D) monolithic micro-actuator fabricated by non-ablative femtosecond laser micromachining and subsequent chemical etching. The actuating principle is based on dielectrophoresis. An analytical modeling of this actuation s ...

Institute of Physics2015

Formation of in-volume nanogratings with sub-100-nm periods in glass by femtosecond laser irradiation

Yves Bellouard, Ya Cheng

We present direct experimental observation of the morphological evolution during the formation of nanogratings with sub-100-nm periods with the increasing number of pulses. Theoretical simulation shows that the constructive interference of the scattering l ...

Optical Society of America2015

Laser-assisted morphing of complex three dimensional objects

Yves Bellouard, Jakub Drs

Morphing refers to the smooth transition from a specific shape into another one, in which the initial and final shapes can be significantly different. A typical illustration is to turn a cube into a sphere by continuous change of shape curvatures. Here, we ...

Optical Society of America2015

A Monolithic Micro-Tensile Tester for Investigating Silicon Dioxide Polymorph Micromechanics, Fabricated and Operated Using a Femtosecond Laser

Yves Bellouard, Christos Edouardos Athanasiou

Mechanical testing of materials at the microscales is challenging. It requires delicate procedures not only for producing and handling the specimen to be tested, but also for applying an accurate and controlled force. This endeavor is even more challenging ...

MDPI2015

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

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

Reymond Clavel, Yves Bellouard

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

Femtosecond-laser generation of self-organized bubble patterns in fused silica

Max-Olivier Hongler, Yves Bellouard

By continuously scanning a femtosecond laser beam across a fused silica specimen, we demonstrate the formation of self-organized bubbles buried in the material. Rather than using high intensity pulses and high numerical aperture to induce explosions in the ...

Optical Society of America2011

Nanoindentation and birefringence measurements on fused silica specimen exposed to low-energy femtosecond pulses

Tristan Colomb, Christian Depeursinge, Yves Bellouard

Femtosecond laser pulses used in a regime below the ablation threshold have two noticeable effects on Fused Silica (a-SiO2): they locally increase the material refractive index and modify its HF etching selectivity. The nature of the structural changes ind ...

2006

Conception de dispositifs en alliage à mémoire de forme en microtechnique

Yves Bellouard

EPFL2000

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