Local tuning of fused silica thermal expansion coefficient using femtosecond laser

Vlugter, Pieter; Block, Erica; Bellouard, Yves

doi:10.1103/physrevmaterials.3.053802

Cited by 17 publications

(19 citation statements)

References 44 publications

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“…More specifically, this hypothesis is based on the imposed sequence of step isochronal annealing associated with quenching to room temperature (after each step), which leads to the occurrence of an additional stress field. This suggestion is supported by a recent publication of Y. Bellouard group 43 . In this recent work the authors report that while densified zones (so-called Type I regime) display a decrease of thermal expansion coefficient, nanogratings (Type II regime) show the opposite trend, with respect to the pristine material.…”

Section: Discussionsupporting

confidence: 62%

Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications

et al. 2020

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We investigate the potential of fabricating thermally stable refractive index contrasts using femtosecond (fs) near-infrared (IR) radiation in aluminosilicate glasses. A set of pure SiO 2-Al 2 O 3 glasses are manufactured, characterized (density and Raman) and investigated after being irradiated by fs laser within the Type II regime. The formation of nanogratings is identified and studied using quantitative birefringence measurements. Their thermal stability is then investigated through 30min step isochronal annealing (up to 1250°C). For both SiO 2 and 50SiO 2-50Al 2 O 3 compositions, the normalized birefringence does not decrease when tested up to 1100°C, while for the 4,6 mol% GeO 2-SiO 2 erased for 20% at 1000°C.

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Section: Discussionsupporting

confidence: 62%

Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications

et al. 2020

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“…The densities of latter samples are 2.248 and 2.244, respectively. This further conﬁrms that the material between porous layers exhibits similar characteristics as type I modiﬁcation, i.e., a denser structure accompanied by a higher Young's modulus [ 43 ] compared with pristine silica.…”

Section: Resultsmentioning

confidence: 99%

An Overview of the Thermal Erasure Mechanisms of Femtosecond Laser‐Induced Nanogratings in Silica Glass

Wang

Cavillon

Ollier

et al. 2021

Physica Status Solidi (a)

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Type II modifications induced by infrared (IR) femtosecond (fs) lasers are used in many optical devices due to their excellent thermal stability at high temperatures (typically >800 °C). The characteristic feature of type II modifications is the formation of nanogratings, which are easily detected through birefringence measurements. However, the measured birefringence is an aggregate value of multiple contributions including form birefringence, stress‐induced birefringence due to permanent volume changes, and point defects. This work investigates the thermal erasure kinetics of each one of these contributions in silica glass. Firstly, samples are irradiated with a fs‐laser using different conditions (polarization, energy). Secondly, accelerated aging experiments are conducted to evaluate the stability of the laser‐induced modifications, including defects, densification, stress field, and porous nanogratings. Finally, the aforementioned contributions to the thermal stability of the nanogratings are identified using spectroscopic techniques (Raman, Rayleigh scattering, UV–vis absorption) and electron microscopy. Moreover, porous nanogratings erasure kinetics are simulated using the Rayleigh–Plesset equation. Herein, a valuable framework in the realization of silica glass‐based optical devices operating at high temperatures (≫800 °) is provided by 1) evidencing the effect of annealing on each erasure mechanism and 2) providing information on the optical response (mainly birefringence) upon annealing.

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“…The exact mechanism leading to the creation of these nanofeatures [2,[10][11][12][13] is to date not established. Nonetheless, this type of modification has been used in various photonics applications, such as polarization converters [14] or optical memory devices [15], but also for controlling the stress state in materials [16,17], inducing controlled displacements [18][19][20], or for tuning properties, such as the coefficient of thermal expansion [21]. To date, these changes of thermomechanical behavior cannot be fully understood, predicted, and controlled without a deeper * pieter.vlugter@epfl.ch understanding of the mechanical properties of the nanogratings.…”

Section: Introductionmentioning

confidence: 99%

Elastic properties of self-organized nanogratings produced by femtosecond laser exposure of fused silica

Vlugter

Bellouard

2020

Phys. Rev. Materials

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Under certain exposure conditions, a femtosecond laser beam focused in the bulk of fused silica leads to the formation of self-organized structures consisting of a series of "nanolayers," parallel to one another. Remarkably, this laser-induced nanoscale anisotropy offers the possibility to locally engineer macroscopic properties of a given substrate by selectively exposing it in arbitrarily chosen locations to a laser beam with designed polarization states. Although various physical properties are affected by the laser, this paper specifically discusses in-plane elastic properties of these nanostructures. Using a method based on monitoring resonant properties of vibrating cantilevers combined with a mechanical model of the nanostructures, the Young's moduli of individual nanolayers are calculated and used to define the stiffness matrix of the composite structure. The model shows a good agreement with measured mechanical properties of arbitrarily oriented nanostructures. This work demonstrates the predictability and controllability of laser-induced nanoscale mechanical properties and offers a framework for engineering arbitrary elastic properties through 3D laser writing.

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Local tuning of fused silica thermal expansion coefficient using femtosecond laser

Cited by 17 publications

References 44 publications

Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications

Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications

An Overview of the Thermal Erasure Mechanisms of Femtosecond Laser‐Induced Nanogratings in Silica Glass

Elastic properties of self-organized nanogratings produced by femtosecond laser exposure of fused silica

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Local tuning of fused silica thermal expansion coefficient using femtosecond laser

Cited by 17 publications

References 44 publications

Femtosecond laser direct writing in SiO2‐Al2O3 binary glasses and thermal stability of Type II permanent modifications

Femtosecond laser direct writing in SiO2‐Al2O3 binary glasses and thermal stability of Type II permanent modifications

An Overview of the Thermal Erasure Mechanisms of Femtosecond Laser‐Induced Nanogratings in Silica Glass

Elastic properties of self-organized nanogratings produced by femtosecond laser exposure of fused silica

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Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications

Femtosecond laser direct writing in SiO₂‐Al₂O₃ binary glasses and thermal stability of Type II permanent modifications