Diagnostic and simulation of ps-laser glass cutting

Eppelt, Urs; Russ, Simone; Hartmann, Claudia; Sun, Mingying; Siebert, Christof; Schulz, Wolfgang

doi:10.2351/1.5062548

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…This is in line with previous statement that the asymmetry is principally caused by plasma effects. Typical literature values of the effective electron collision time are in the low fs regime [31], with a rather large uncertainty. In fact, already assuming a constant collision time is a rather crude approximation.…”

Section: Numerical Simulation Resultsmentioning

confidence: 99%

All-round: combining laser cutting and edge shaping of glass

Sohr

Thomas

Skupin

2022

Eur. Phys. J. Spec. Top.

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Cutting glass to shape with ultra short laser pulses is nowadays a well established industrial process. Pulses with an elongated straight focal volume (line focus) are used to modify the workpiece throughout its entire depth with one single laser shot. At the same time, processed glass is often required to have a seamed or round edge, which usually requires an extra grinding step.Here we demonstrate that curved line foci can be used to combine cutting and edge shaping of glass sheets in one laser process. We reconsider the Airy-Gauss beam for this purpose, and suggest modifications to the beam profile to avoid unwanted effects, in particular an asymmetric laser modification of the glass sheet. We provide a combined experimental and numerical analysis of the laser process, and show a symmetric convex edge created in a 920 µm thick glass sheet.

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Section: Numerical Simulation Resultsmentioning

confidence: 99%

All-round: combining laser cutting and edge shaping of glass

Sohr

Thomas

Skupin

2022

Eur. Phys. J. Spec. Top.

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“…1 (b). Typical literature values of τ c are in the low fs regime, 6 with a rather large uncertainty. In fact, already assuming a constant electron-electron collision time is a rather crude approximation.…”

Section: Preferential Absorptionmentioning

confidence: 99%

Using airy beams for combined glass cutting and edge shaping

Sohr¹,

Thomas

Skupin

2022

Laser-Based Micro- And Nanoprocessing XVI

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When glass is cut to shape, ultra short laser pulses with an elongated, usually straight, focal volume (line focus) can be used to modify the workpiece throughout its entire depth with one single laser shot. At the same time, processed glass is often required to have a seamed or round edge, which usually requires an extra grinding step. Alternatively, curved line foci can be used to combine cutting and edge shaping of glass sheets in one laser process. We reconsider the Airy-Gauss beam for this purpose. Plasma ignition in the side lobes of the Airy beam and surface damage provoke unwanted effects, in particular an asymmetric laser modification of the glass sheet. We provide numerical results on origins of the asymmetry of the volume modification and show that with rather simple optical adjustments a symmetric convex edge can be created in a 920 µm thick glass sheet.

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“…1a-c). In case of entrance side machining detrimental effects of parasitic light penetrating into the volume are often an issue 1,2,3 . For processing at the exit surface disturbance of propagation due to effects of the entrance surface or the volume traversed has to be avoided.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast laser processing of transparent materials supported by in-situ diagnostics

Kumkar¹,

Kaiser²,

Kleiner³

et al. 2021

Preprint

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For the development of industrial NIR ultrafast laser processing of transparent materials, the absorption inside the bulk material has to be controlled. Applications we aim for are front and rear side ablation, drilling and inscription of modifications for cleaving and selective laser etching of glass and sapphire in sheet geometry. We applied pump probe technology and in situ stress birefringence microscopy for fundamental studies on the influence of energy and duration (100 fs – 20 ps), temporal and spatial spacing, focusing and beam shaping of the laser pulses. Applying pump probe technique we are able to visualize differences of spatio-temporal build up of absorption, self focusing, shock wave generation for standard, multispot and beam shaped focusing. Incubation effects and disturbance of beam propagation due to modifications or ablation can be observed. In-situ imaging of stress birefringence gained insight in transient build up of stress with and without translation. The results achieved so far, demonstrate that transient stress has to be taken into account in scaling the laser machining throughput of brittle materials. Furthermore it points out that transient stress birefringence is a good indicator for accumulation effects, supporting tailored processing strategies.Cutting results achieved for selective laser etching by single pass laser modification exemplifies the benefits of process development supported by in situ diagnostics.

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Diagnostic and simulation of ps-laser glass cutting

Cited by 9 publications

References 22 publications

All-round: combining laser cutting and edge shaping of glass

All-round: combining laser cutting and edge shaping of glass

Using airy beams for combined glass cutting and edge shaping

Ultrafast laser processing of transparent materials supported by in-situ diagnostics

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