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Efficient Ultrashort Pulsed Laser Processing by Dynamic Spatial Light Modulator Beam Shaping for Industrial Use

  • We report on the effect of different transversal beam shapes on the efficiency of ablation processes and the resulting surface characteristics. A possibility to efficiently apply ultrashort pulsed lasers with high average power is beam shaping. By using a cooled reflective based liquid crystal spatial light modulator to generate different spot distributions, it is possible to spatially allocate the available power to avoid excessive high fluences. In our experiments, we determine the optimal fluence to ablate the maximum volume per watt to be in the range of 0.2-0.4 J/cm². Based on this fluence, we increase the number of spots from one to a maximum of twenty to ablate steel in a multilayer scanning-based process. In this context, we examine the influence of different separation distances between the spots on the ablation efficiency and roughness. Subsequently to these investigations, we develop an efficient roughing process with higher ablation rates and a nearly constant roughness.

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Metadaten
Author:Christian Lutz, Gian-Luca Roth, Stefan RungORCiD, Cemal Esen, Ralf HellmannORCiD
DOI:https://doi.org/10.2961/jlmn.2021.01.2011
Parent Title (English):Journal of Laser Micro/Nanoengineering
Document Type:Article
Language:English
Year of Completion:2021
Release Date:2021/03/04
GND Keyword:Ultrakurzzeitlaser; Lichtmodulator
Volume:16
Issue:1
First Page:1
Last Page:6
Urheberrecht:1
research focus :Intelligent Systems / Intelligent Sensors and Signals
Materials / Innovative Material Processing
Materials / Material Testing & Sensor Technology
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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