Pushing ultrafast laser material processing into a new regime of plasma-controlled ablation

Informations projet

PULSAR

N° de convention de subvention: 682032

DOI

10.3030/682032

Projet clôturé

Date de signature de la CE 3 Mars 2016

Date de début 1 Juillet 2016

Date de fin 31 Decembre 2021

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 1 996 581,00

Contribution de l’UE

€ 1 996 581,00

Coordonné par

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 4 - PULSAR (Pushing ultrafast laser material processing into a new regime of plasma-controlled ablation)

Période du rapport: 2021-01-01 au 2021-12-31

Résumé du contexte et des objectifs généraux du projet

Ultra-intense femtosecond laser pulses promise to become a fast, universal, predictable and green tool for material processing at micro and nanometric scale. The recent tremendous increase in commercially available femtosecond laser energy at high repetition rate opens a wealth of novel perspectives for mass production. But even at high energy, laser processing remains limited to high-speed scanning point by point removal of ultra-thin nanometric layers from the material surface. This is because the uncontrolled laser-generated free-electron plasma shields against light and prevents reaching extreme internal temperatures at very precise nanometric scale.
PULSAR aimed at breaking this barrier and developing a radically different concept of laser material modification regime based on free-electron plasma control.
PULSAR has developed a combination of new simulations of laser-plasma interaction, including the development of a code and experimental tools to characterize laser-induced plasma densities. PULSAR key concept is highly generic and the results have initiated new research across laser and plasma material processing, plasma physics and ultrafast optics.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

PULSAR has developed a complete theoretical, numerical and experimental platform to characterize, understand and control nanometric plasmas generated in the bulk of transparent materials. The energy deposition process is crucial to understand the structuration of matter that follows after the laser pulse went through the medium. PULSAR team has built two complementary numerical codes to describe laser matter interaction when an ultrashort, femtosecond, pulse propagates inside a transparent medium such as glass and generates a plasma. In parallel, a novel experimental approach for plasma characterization has been built.
The fundamental insights offered by simulations and characterization tools have enabled the development of new means to confine laser-matter interaction, to successfully increase ablation efficiency in various geometries. Our results have been reported, to date, in 16 journal publications, 2 book chapters, 31 invited presentations, 34 contributions to international conferences.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

The platform PULSAR has built is uniquely positioned to explore laser-matter interaction. This has enabled the understanding of several long-standing problems in the field of ultrafast laser materials processing. This is highly enabling to design novel strategies to process materials at high-speed, high efficiency and extreme spatial resolution.

ultra-thick glass cutting via ultrafast stealth dicing with shaped beams

Laser beams in our experimental setup