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Improved laser glass cutting by spatio-temporal control of energy deposition using bursts of femtosecond pulses

Abstract : We demonstrate the advantage of combining non-diffractive beam shapes and femtosecond bursts for volume laser processing of transparent materials. By redistribution of the single laser pulse energy into several sub-pulses with 25 ns time delay, the energy deposition in the material can be enhanced significantly. Our combined experimental and theoretical analysis shows that in burst-mode detrimental defocusing by the laser generated plasma is reduced, and the non-diffractive beam shape prevails. At the same time, heat accumulation during the interaction with the burst leads to temperatures high enough to induce material melting and even in-volume cracks. In an exemplary case study, we demonstrate that the formation of these cracks can be controlled to allow high-speed and high-quality glass cutting.
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https://hal.archives-ouvertes.fr/hal-01671239
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Submitted on : Friday, December 22, 2017 - 10:05:24 AM
Last modification on : Monday, June 14, 2021 - 10:02:58 AM

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K. Mishchik, R. Beuton, O. Dematteo Caulier, Stefan Skupin, B. Chimier, et al.. Improved laser glass cutting by spatio-temporal control of energy deposition using bursts of femtosecond pulses. Optics Express, Optical Society of America - OSA Publishing, 2017, 25 (26), ⟨10.1364/OE.25.033271⟩. ⟨hal-01671239⟩

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