Improved laser glass cutting by spatio-temporal control of energy deposition using bursts of femtosecond pulses
Résumé
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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Mishchik et al. - Optics Express - 2017 - Improved laser glass cutting by spatio-temporal control of energy deposition using bursts of f.pdf (3.73 Mo)
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