Surface Probing of Ultra‐Short‐Pulse Laser Filament Cut Window Glass and the Impact on the Separation Behavior

Werr, Ferdinand; Veber, Alexander; Brehl, Martin; Bergler, Michael; Werner, Dirk; Eppelt, Urs; Müllers, Ludger; Ligny, Dominique de

doi:10.1002/adem.202000471

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…A clearly visible crack is propagating along the filament line (2A/2 & 3; see the yellow arrows). Following the interpretation of our previous investigation, this surface crack is correlated with the presence of a thorough micro crack network over the entire thickness of the material [8]. It is visible for all parameter sets, except for the sample prepared with Burst 2/Pitch 5 at the Focus-Side.…”

Section: Surface Modifications At the Interface-melting Effectssupporting

confidence: 71%

“…Owing to the short pulse width, the energy that modifies the material is deposited highly localized with a rather small heat-affected zone. Next to that a practical non-gap cut can be achieved as no grooves are introduced at the surfaces, which is beneficial to obtain a homogenous cut edge without large-scale chipping and therefore to give high mechanical strength to the final product [8]. It is possible to free-form cut glass with small radii and undercuts, which is restricted in other cutting techniques.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Short-Pulse Laser Filaments for Float Glass Cutting: Influence of Laser Parameters on Micro Cracks Formation

et al. 2022

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Utilizing ultra-short-pulse laser filamentation of glass is one of the latest developed techniques to cut glass. In comparison with other techniques the superior benefits are a small heat-affected zone, a quasi-non-gap cut, and the possibility to free from cut. However, despite the large interest in the laser/glass interaction for various laser sources and pulse durations, the process of cleaving and the underlying mechanisms are fairly undescribed. In this study, we utilized a Nd:YAG laser with an average power of 100 W, a center wavelength of 1,064 nm, and a pulse duration of 12 ps via a specially designed optic to generate laser filamentation in soda-lime- and borosilicate glass with varying Pitch and Burst parameters. The filaments and cut edge are analyzed with scanning electron- and laser scanning microscopy to study the topological phenomena and roughness. Photoelastic measurements were done to assess the stress distribution within the glass and show cumulative interactions at the filament extremity. From the observations made, phenomenological models are proposed to describe the initial micro crack formation considering the shock wave and thermal influence caused by the laser pulses. Two types of micro cracks are identified, with radial cracks passing through the filament and bypass cracks that form around the laser-affected zone. Models are elaborated for both glass types to evaluate the influence of a parameter change on the micro crack formation and the cleaving guidance. The different behavior between soda-lime- and borosilicate glass, with their distinct physical properties, helps to interpret the influence of laser parameters on the micro crack formation and the cleaving guidance.

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Section: Surface Modifications At the Interface-melting Effectssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Ultra-Short-Pulse Laser Filaments for Float Glass Cutting: Influence of Laser Parameters on Micro Cracks Formation

et al. 2022

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“…The ultrafast laser burst trains provide clear benefits in generating filamentation tracks to guide the cleaving of glass substrates. The laser filament cutting of soda-lime silicate glass was validated using a picosecond pulsed Nd:YAG laser with varying burst energies [124]. The cleaving cracks were guided by the filament only if the network of microcracks is sufficiently developed.…”

Section: Processing Of Transparent Materialsmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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Ultra-short pulse lasers, generating coherent light pulses with pulse durations in the picosecond and femtosecond range, are becoming popular in precision laser microfabrication. They are benefiting not only from well-predicted laser ablation with the suppressed heat-affected zone but also by opening new processing opportunities, especially in transparent materials, due to enhanced non-linear interaction with the material. In this review, the evolution of various kinds of mode-locked lasers from a scientific toy to a robust industrial tool is reviewed. The utilization benefits of high-average-power, high-pulse-repetition-rate ultra-short pulse laser are closely related to beam shaping and manipulation techniques. Fast beam scanning with galvanometric and polygon scanners as well as multi-beam parallel processing methods were developed. Some hot applications areas are briefly described. The efficient use of photons from ultra-short pulse lasers pushed the development of optimization methods in the ablation process. Efforts toward upscaling the process by increasing the average power of mode-locked lasers made feedback to laser developers, and burst regime became a necessity as well as high-speed beam scanning devices. Unique opportunities of ultra-short pulses are successfully exploited in machining transparent materials, with glass separation being the leading application.

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“…In the past decade, the processing of glass was extended by a vast range of new methods, especially by laser-based cutting [1,2], additive manufacturing [3][4][5] or direct structuring [6,7]. All these methods, also including more conventional approaches like molding [8], utilize temperature as a core element.…”

Section: Introductionmentioning

confidence: 99%

Coupling Raman, Brillouin and Nd3+ Photo Luminescence Spectroscopy to Distinguish the Effect of Uniaxial Stress from Cooling Rate on Soda–Lime Silicate Glass

et al. 2021

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Evolution of spectroscopic properties of a soda–lime silicate glass with different thermal history and under applied uniaxial stress was investigated using Raman and Brillouin spectroscopies as well as Nd3+ photoluminescence techniques. Samples of soda–lime silicate with a cooling rate from 6 × 10−4 to 650 K/min were prepared either by controlled cooling from the melt using a differential scanning calorimeter or by a conventional annealing procedure. Uniaxial stress effects in a range from 0 to −1.3 GPa were investigated in situ by compression of the glass cylinders. The spectroscopic observations of rearrangements in the network structure were related to the set cooling rates or the applied uniaxial stress to calculate an interrelated set of calibrations. Comparing the results from Raman and Brillouin spectroscopy with Nd3+ photoluminescence analysis, we find a linear dependence that can be used to identify uniaxial stress and cooling rate in any given combination concurrently. The interrelated calibrations and linear dependence models are established and evaluated, and equations relating the change of glass network due to effects of cooling rate or uniaxial stress are given.

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Surface Probing of Ultra‐Short‐Pulse Laser Filament Cut Window Glass and the Impact on the Separation Behavior

Cited by 4 publications

References 21 publications

Ultra-Short-Pulse Laser Filaments for Float Glass Cutting: Influence of Laser Parameters on Micro Cracks Formation

Ultra-Short-Pulse Laser Filaments for Float Glass Cutting: Influence of Laser Parameters on Micro Cracks Formation

Ultra-Short Pulse Lasers for Microfabrication: A Review

Coupling Raman, Brillouin and Nd3+ Photo Luminescence Spectroscopy to Distinguish the Effect of Uniaxial Stress from Cooling Rate on Soda–Lime Silicate Glass

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