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Poster

Student Spectrometer-based Ultrashort Pulsed Laser Selective Microstructuring of Ni/NiCr Multi-layer Coatings

Wednesday (24.06.2020)
11:59 - 12:02 Room 1
Part of:
Line-Up:
- Poster Processing of Functional Texturing on Micro-fibers by Laser Induced Periodic Surface Structures 1 Prof. Masaki Yamaguchi
- Poster 3D microfabrication of thermoset polymer PDMS using laser-induced bubble 1 Prof. Yasutaka Hanada
- Poster *student* Laser-Peening with solid state medium as plasma confinement layer 1 Yuki Sugimoto
- Poster *student* Numerical Simulation and Test Experiments of Selective Laser Thermoregulation for Accelerated Degradation Test of SiC/SiC CMC 1 Hayato Koshiji
- Poster *student* Laser peening of sprayed ceramics film 1 Yuya Yasuyoshi
- Poster *student* Influence of thickness of plasma confinement layer on laser peening using near infrared laser 1 Hikaru Hirata
- Poster *student* Green femtosecond laser direct writing using reduction of glyoxylic acid Co/Ni complexes 1 Hikaru Nakatani
- Poster Ultrafast pulse GHz burst mode laser ablation for efficient surface microprocessing 1 Ph.D. Francesc Caballero Lucas
- Poster *student* Development of hybrid laser system with blue diode laser and single mode fiber laser for welding of pure copper 1 Shumpei Fujio
- Poster *student* High stability of frequency and robustness of noise-like pulse fiber laser 1 Hitoshi Nakano
- Poster *student* Broadband pulsed fiber laser for suppression of stimulated Brillouin scattering 1 Tetsuya Yamazaki
- Poster Aligned growth of ZnO nanowires on diamond by nanoparticle-assisted pulsed laser deposition 1 Dr. Daisuke Nakamura
- Poster *student* Spectrometer-based Ultrashort Pulsed Laser Selective Microstructuring of Ni/NiCr Multi-layer Coatings 1 Chao He
- Poster *student* Femto- and nanosecond laser surface modification of stainless steel 1 Dipl.-Volkswirt Paulina Dzienny
- Poster Laser writing of waveguides in porous glass for small molecules detection 1 Dr. Roman Zakoldaev
- Poster *student* Homogeneous intensity within the Rayleigh length and enhanced depth of focus for Gaussian beams 1 Christian Bischoff
Session Chair


Session PS: Poster Session 01
Belongs to:
Topic PS: Poster Session


Microstructuring using ultrashort laser pulses is nowadays an established process for high precision manufacturing and has a broad spectrum of applications. This paper concentrates on the characterisation of the ultrashort pulsed laser ablation process of thermal sensitive Ni/NiCr thin layers deposited on Al2O3 substrates. The Ni and NiCr thin layers were coated by physical vapor deposition (PVD) process and had a mean thickness of approximately 2-3 µm. In order to achieve a material-defined ablation process, we firstly identified the removal threshold of Ni(0.4 J/cm²), NiCr(0.47 J/cm²) and Al2O3(1.1 J/cm²). The minimum removal depth in Ni and NiCr thin layers by a single laser scanning path were experimentally investigated and were 0.15 µm and 0.13 µm respectively. In addition, the Ni/NiCr single layer on Al2O3 substrate could be structured to a defined depth. Following that, with the aim to distinguish the ablated materials, we applied a UV-VIS-IR spectrometer to acquire the spectra of the laser-induced plasma generated during the ablation of the Ni and NiCr layers in the range 200 nm to 1100 nm. The characteristic peaks of chrome at 425.4 nm, 427.5 nm and 429 nm were detected. Based on the analysis on the plasma emission spectra, we can characterize the local ablated material composition, and thus perform a material-defined ablation process in the Ni/NiCr multi-layer system, which have very similar removal threshold values.

 

Compared with the profiling-based laser microstructuring the material-defined ablation process by means of spectroscopy offers several advantages such as high precision and efficiency. The spectrum of ablated material can be acquired within the minimum removal depth. Moreover, the process has great potential to enhance the controllability in microstructuring of thin layers with inhomogeneous thickness.

Speaker:
Chao He
RWTH Aachen University
Additional Authors:
  • Dr. Arnold Gillner
    Fraunhofer Institute for Laser Technology ILT

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