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Femtosecond Laser-Based Micromachining of Rotational-Symmetric Sapphire Workpieces

  • Sapphire is a robust and wear-resistant material. However, efficient and high-quality micromachining is still a challenge. This contribution demonstrates and discusses two novels, previously unreported approaches for femtosecond laser-based micromachining of rotational-symmetric sapphire workpieces, whereas both methods are in principal hybrids of laser scanning and laser turning or laser lathe. The first process, a combination of a sequential linear hatch pattern in parallel to the workpiece’s main axis with a defined incremental workpiece rotation, enables the fabrication of sapphire fibers with diameters of 50 µm over a length of 4.5 mm. Furthermore, sapphire specimens with a diameter of 25 µm over a length of 2 mm can be fabricated whereas an arithmetical mean height, i.e., Sa parameter, of 281 nm is achieved. The second process combines a constant workpiece feed and orthogonal scanning with incremental workpiece rotation. With this approach, workpiece length limitations of the first process are overcome and sapphire fibers with an average diameter of 90 µm over a length of 20 cm are manufactured. Again, the sapphire specimen exhibits a comparable surface roughness with an average Sa value of 249 nm over 20 cm. Based on the obtained results, the proposed manufacturing method paves an innovative and flexible, all laser-based way towards the fabrication or microstructuring of sapphire optical devices, and thus, a promising alternative to chemical processes.

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Author:Stefan KeferORCiD, Julian Zettl, Cemal Esen, Ralf HellmannORCiD
URL:https://www.mdpi.com/1996-1944/15/18/6233
DOI:https://doi.org/10.3390/ ma15186233
Parent Title (English):Materials
Document Type:Article
Language:English
Year of Completion:2022
Date of first Publication:2022/09/08
Release Date:2023/03/22
Tag:ablation threshold; femtosecond laser; laser turning; micromachining; sapphire
GND Keyword:Femtosekundenlaser; Saphir
Volume:15
Issue:18
First Page:6233
Last Page:6233
Urheberrecht:1
Institutes:Fakultät Ingenieurwissenschaften / Labore / Angewandte Lasertechnik und Photonik (alp)
research focus :Materials / Innovative Material Processing
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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