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KEINE FREISCHALTUNG - Urheberrecht 0 bei Dokument mit Volltext Picosecond laser microvia drilling of ABF material using MHz burst mode

  • We report on a comprehensive study of laser percussion microvia drilling of Ajinomoto build-up film (ABF) material using an ultrashort pulsed laser in MHz burst mode. After laser processing, microvia drilling quality is being evaluated by the fabricated diameter and taper using laser scanning microscopy and metallography. The influences of the incubation effect, heat accumulation and shielding effects as a result of pulse to pulse interactions are being discussed on the ablation threshold, penetration depth and laser microvia drilling quality. We find that an increasing heat accumulation in MHz burst mode processing is responsible for the void formation and delamination of the insulating ABF layer. Therefore, the parameter clearance is introduced to evaluate these effects on the microvia sidewalls. For a comparable clearance, applying 2 intra-burst pulses achieves an average reduced taper of down to 19.5% compared to single pulse mode. At the same time, a reduced laser drilling time of 16.7% per microvia highlights the enormous potential of the MHz burst mode for laser drilling of ABF material in printed circuit board fabrication.

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Metadaten
Author:Tom Häfner, Kay BischoffORCiD, Jonas Helm, Tim Kunz, Stefan RungORCiD, Cemal Esen, Ralf HellmannORCiD
Parent Title (English):Materials Research Express
Document Type:Article
Language:English
Year of Completion:2023
Release Date:2024/02/28
GND Keyword:Ultrakurzzeitlaser; Pikosekundenbereich
Volume:10
Issue:9
First Page:096301
Last Page:096311
Urheberrecht:1
Institutes:Fakultät Ingenieurwissenschaften / Labore / Angewandte Lasertechnik und Photonik (alp)
research focus :Materials / Innovative Material Processing
Reviewed:ja
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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