Analysis of process parameter for the ablation of optical glasses with femto- and picosecond laser pulses

Schindler, Christian; Friedrich, Maria; Bliedtner, Jens

doi:10.1117/12.2212826

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…As seen in Fig. 2, crack depths for the materials and parameter sets span between 32 µm (BK10) and 441 µm (FS11) using an SSD area threshold of 1%, exceeding previously mentioned damage depths from previous studies [5] by one order of magnitude. The results emphasize the need for further research to gain a better understanding of damage mechanisms in USP laser machining and to optimize areal USP laser machining in regard to SSD.…”

Section: Results and Conclusionmentioning

confidence: 49%

Investigation on Subsurface Damage Patterns in Ultrashort Pulse Laser Machining of Glass using Optical Coherence Tomography

Frank,

Reichenbächer,

Seiler

et al. 2023

EPJ Web Conf.

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Ultrashort pulse (USP) laser ablation is gaining popularity as a novel manufacturing technique for brittle materials, enabling the creation of complex freeform shapes that are challenging to produce with conventional optics manufacturing techniques. Freeforms have revolutionized optics manufacturing by providing designers with increased degrees of freedom using non-rotational symmetric components. However, this evolution presents new challenges for manufacturing processes, calling for innovative solutions such as USP ablation. To ensure the industrial viability of areal USP laser machining, it is crucial to not only consider material removal rates but also surface quality and subsurface damage (SSD). Especially for optical applications, harsh quality requirements must be met. This study investigates the SSD patterns of fused silica (FS) and borosilicate glass N-BK7 (BK) processed under different laser wavelengths, beam geometries and processing parameters using high-resolution optical coherence tomography (OCT). It is shown that OCT as non-destructive and 3D evaluation method is well-suited for analysing USP processes. The discovered differences in defect morphology between FS and BK emphasize the importance of selecting appropriate processes and process parameters when working with different materials. Compared to previous studies, for the parameter sets analysed here using OCT, much higher defects depths of up to 441 µm were revealed.

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Section: Results and Conclusionmentioning

confidence: 49%

Investigation on Subsurface Damage Patterns in Ultrashort Pulse Laser Machining of Glass using Optical Coherence Tomography

Frank,

Reichenbächer,

Seiler

et al. 2023

EPJ Web Conf.

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show abstract

“…The achievements over the last years are continuing in fields of ultrashort pulsed (USP) lasers and their application and widen the landscape of alternative technologies for optical component manufacturing and system integration. There are many potential USP-laser based processes in the long-term forecast: Athermal ablation for 3Dmaterial removal [7][8][9] or local polishing 10-13 by selective thermal interaction are two promising technologies, which combined in one machine could disrupt optics manufacturing. Other approaches like edging by ablation or by filament generation up to several millimeter thick glasses 14 , direct laser micro-or nanostructuring [15][16] , selective laser etching for micromachining 3D-parts [17][18] or additive manufacturing techniques like two-photon polymerization for structured or printed optics 19 are already applied in industrial environment.…”

Section: Laser-based Process Chainsmentioning

confidence: 99%

Freeform Optics: current challenges for future serial production

2017

Self Cite

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One of the major developments in optics industry recently is the commercial manufacturing of freeform surfaces for optical mid-and high performance systems. The loss of limitation on rotational symmetry enables completely new optical design solutionsbut causes completely new challenges for the manufacturer too. Adapting the serial production from radialsymmetric to freeform optics cannot be done just by the extension of machine capabilities and software for every process step. New solutions for conventional optics productions or completely new process chains are necessary.

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Ultrashort Pulse Laser Material Processing

Bliedtner¹,

Schindler²,

Seiler

et al. 2016

Laser Technik Journal

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The field of ultrashort pulsed lasers has grown dramatically over the past years. Besides many research topics, the industrial application, especially for laser material processing has focused around USP lasers. The success of USP lasers contributes to many economic branches. The advantages ranges from higher output power, shorter pulse duration, innovative amplifier systems to beam guidance. One question remains: Where is the potential for industrial applications of this technology? This article presents the recent research and the derived possible area of application for USP lasers. Our aim is to introduce the huge material spectrum to possible users. Furthermore, the laser application center in Jena, and the scope prospective customers is introduced.

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Analysis of process parameter for the ablation of optical glasses with femto- and picosecond laser pulses

Cited by 6 publications

References 2 publications

Investigation on Subsurface Damage Patterns in Ultrashort Pulse Laser Machining of Glass using Optical Coherence Tomography

Investigation on Subsurface Damage Patterns in Ultrashort Pulse Laser Machining of Glass using Optical Coherence Tomography

Freeform Optics: current challenges for future serial production

Ultrashort Pulse Laser Material Processing

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