Laser ablation and micromachining with ultrashort laser pulses

Liu, X.; Du, D.; Mourou, G.

doi:10.1109/3.631270

Cited by 880 publications

(483 citation statements)

References 34 publications

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“…However, the heat absorbed at the focal point is sufficient to generate radial microcracks from the hoop stresses associated with thermal expansion (Fig. 2b) [41][42][43] . These cracks only propagate over short distances, because the hoop stresses decrease rapidly away from the focal point.…”

Section: Resultsmentioning

confidence: 99%

Overcoming the brittleness of glass through bio-inspiration and micro-architecture

2014

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Highly mineralized natural materials such as teeth or mollusk shells boast unusual combinations of stiffness, strength and toughness currently unmatched by engineering materials. While high mineral contents provide stiffness and hardness, these materials also contain weaker interfaces with intricate architectures, which can channel propagating cracks into toughening configurations. Here we report the implementation of these features into glass, using a laser engraving technique. Three-dimensional arrays of laser-generated microcracks can deflect and guide larger incoming cracks, following the concept of 'stamp holes'. Jigsawlike interfaces, infiltrated with polyurethane, furthermore channel cracks into interlocking configurations and pullout mechanisms, significantly enhancing energy dissipation and toughness. Compared with standard glass, which has no microstructure and is brittle, our bioinspired glass displays built-in mechanisms that make it more deformable and 200 times tougher. This bio-inspired approach, based on carefully architectured interfaces, provides a new pathway to toughening glasses, ceramics or other hard and brittle materials.

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Section: Resultsmentioning

confidence: 99%

Overcoming the brittleness of glass through bio-inspiration and micro-architecture

2014

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“…Nanoplasmonics has not been considered in conventional models of dielectric breakdown with short [4] or ultrashort [5] pulses-nanostructures are hard to observe inside dielectrics and plasmas are hard to diagnose. We observe the nanostructures by cutting or grinding the dielectric to the modified zone and polishing and etching the surface before imaging it with an atomic force microscope (AFM) [6] or a scanning electron microscope (SEM).…”

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confidence: 99%

Optically Produced Arrays of Planar Nanostructures inside Fused Silica

et al. 2006

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Optically produced arrays of planar nanostructures inside fused silica Bhardwaj, V. R.; Simova, E.; Rajeev, P. P.; Hnatovsky, C.; Taylor, R. S.; Rayner, D. M.; Corkum, P. B. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12327452&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12327452&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

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“…Ces mecanismes sont tres complexes puisqu'ils dependent, a la fois des caracteristiques de la source laser ( fluence, longueur d'onde, profil spatio-temporel de Pimpulsion, taux de repetition) et des proprietes optiques et thermiques du materiau considere, qui peuvent evoluer considerablement au cours de l'irradiation a cause des effets thermiques, de phenomenes de transitions de phase, ou encore de reactions chimiques. Quelque soit la nature du materiau considere (dielectrique, semiconducteur, metal), les etudes recentes [3][4][5][6][7] montrent le role particulierement important joue par la duree de l'impulsion laser sur le phenomene d'ablation, pour trois raisons : (i) Les intensites extremement elevees emises par les sources a impulsions ultra-courtes ( I ~ 10 14 -10 15 W/cm 2 ), favorisent les processus d'absorption multiphotoniques. (ii) En regime femtoseconde, l'impulsion laser n'interagit plus avec le plasma qui se forme apres l'extinction de la source d'excitation.…”

Section: Interaction Laser-matiere Et Formation Du Plasmaunclassified

Les dépôts en couches minces par ablation laser en régime d'impulsions ultra-courtes : état de l'art et perspectives

Fogarassy

2001

J. Phys. IV France

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Resume : Le developpement recent de sources femtosecondes de tres fortes intensites (10 14 -10 15 W/cm 2 ) ouvre des perspectives nouvelles au precede de depot en couches minces par photo-ablation, en raison notamment, du caractere athermique de 1'interaction laser-matiere en impulsions ultra-courtes, et de la generation de plasmas tres energetiques. Apres avoir rappele les micanismes fondamentaux mis en jeu dans ce regime et les consequences attendues sur les proprietes des depots, nous ferons un bilan des travaux realises dans ce domaine, qui concernent tres majoritairement les films de carbone. Nous tenterons aussi de degager les perspectives de cette technique, liees en partie au developpement futur des sources femtosecondes.

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Laser ablation and micromachining with ultrashort laser pulses

Cited by 880 publications

References 34 publications

Overcoming the brittleness of glass through bio-inspiration and micro-architecture

Overcoming the brittleness of glass through bio-inspiration and micro-architecture

Optically Produced Arrays of Planar Nanostructures inside Fused Silica

Les dépôts en couches minces par ablation laser en régime d'impulsions ultra-courtes : état de l'art et perspectives

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