Thin glass processing with various laser sources

Collins, Adam R.; Milne, David; Prieto, Camilo; O’Connor, Gerard M.

doi:10.1117/12.2077217

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…The fracture must start at the edge of the material where a crack is already present. This method is unsuitable for thin ceramics as the rapid heating of the substrate can cause stray fracture due to lateral heat diffusion causing thermal stress outside the desired region . Ultrashort pulse lasers are more suitable for scribing brittle materials due to nonlinear absorption mechanisms and minimal thermal effects .…”

Section: Introductionmentioning

confidence: 99%

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Mechanically inspired laser scribing of thin brittle materials

et al. 2017

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Laser processing of thin flexible ceramics and glasses is challenging due to the incurred brittleness and unfavorable thermal and optical properties of such materials. We describe an alternative laser cutting method which utilizes surface stress raisers to cleave brittle substrates along a defined path. An ultrashort laser source is used to precisely pattern a plurality of aligned elliptical recesses on the material surface. The apex of an ellipse concentrates applied tensile stresses. Depending on the elliptical dimensions, the achievable stress concentration factor can be up to 50. The orientation of the ellipses defines a preferred scribing path. The technique was successfully applied to thin flexible yttria stabilized zirconia ceramic and borosilicate glass substrates. The form and properties of the material play an important role during the fracture process. Polycrystalline ceramics were found to accurately auto cleave along the path due to stresses produced during the laser ablation. The resulting fractured surface is of higher quality and strength than surfaces cut using full body laser cutting techniques, while the crystalline phase is preserved. The optical setup is simple, low cost, and compatible with roll-to-roll manufacturing. K E Y W O R D Sbioceramics, borosilicate glass, fracture, lasers processing, zirconia: yttria stabilized

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Section: Introductionmentioning

confidence: 99%

“…Ablative cutting techniques are possible by repeatedly scanning a focused laser along the material surface. The edge quality of ablative cuts is reasonable, however, processing speeds are poor . Techniques for improving processing speeds have been developed, but speeds remain uneconomical …”

Section: Introductionmentioning

confidence: 99%

Mechanically inspired laser scribing of thin brittle materials

et al. 2017

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Ultrafast laser burst-train filamentation for non-contact scribing of optical glasses

Li¹,

Ertorer²,

Herman³

2019

Opt. Express

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Mechanically inspired laser scribing of thin flexible glass

Collins

O’Connor

2015

Opt. Lett.

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Laser cutting of thin glass (<100 μm) has proven problematic. We describe an alternative laser scribing method that utilizes surface stress raisers. An ultrashort laser source is used to precisely pattern a plurality of aligned elliptical recesses on the glass. The apex of an ellipse concentrates applied tensile stresses. Depending on the elliptical dimensions, the stress concentration factor can be several tens of magnitude. The orientation of the ellipses defines a preferred scribing path. Tensile stress is applied orthogonally to the path and causes mode I fracture. The resulting scribe is of higher quality and strength than are possible with a full body laser cut. The optical setup is simple, low in cost, and compatible with future roll-to-roll manufacturing. The stress field around a stress raiser was analyzed using finite element method analysis. Consequently, the stress raiser process offers an alternative to other processes which employ high numerical aperture optics for thin glass scribing.

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Thin glass processing with various laser sources

Cited by 3 publications

References 20 publications

Mechanically inspired laser scribing of thin brittle materials

Mechanically inspired laser scribing of thin brittle materials

Ultrafast laser burst-train filamentation for non-contact scribing of optical glasses

Mechanically inspired laser scribing of thin flexible glass

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