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Millijoule femtosecond micro-Bessel beams for ultra-high aspect ratio machining

Abstract : We report on a functional experimental design for Bessel beam generation capable of handling high-energy ultra-short pulses (up to 1.2 mJ per pulse of 50 fs duration). This allows us to deliver intensities exceeding the breakdown threshold for air or any dielectric along controlled micro-filaments with lengths exceeding 4 mm. It represents an unprecedented upscaling in comparison to recent femtosecond Bessel beam micromachining experiments. We produce void microchannels through glass substrates to demonstrate that aspect ratios exceeding 1200: 1 can be achieved by using single high-intensity pulses. This demonstration must lead to new methodologies for deep-drilling and high-speed cutting applications. (C) 2015 Optical Society of America
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https://hal.archives-ouvertes.fr/hal-01418530
Contributor : Gaëlle Coustillier <>
Submitted on : Friday, December 16, 2016 - 5:40:04 PM
Last modification on : Wednesday, April 14, 2021 - 3:37:58 AM

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Sambit Mitra, Margaux Chanal, Raphael Clady, Alexandros Mouskeftaras, David Grojo. Millijoule femtosecond micro-Bessel beams for ultra-high aspect ratio machining. Applied optics, Optical Society of America, 2015, 54 (24), pp.7358-7365. ⟨10.1364/AO.54.007358⟩. ⟨hal-01418530⟩

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