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Ultrafast pulse GHz burst mode laser ablation for efficient surface microprocessing

Wednesday (24.06.2020)
11:44 - 11:47 Room 1
Part of:
- 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
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Topic PS: Poster Session

Lasers providing ultrashort pulses are becoming widely used for multiple applications both in fundamental research and practical purposes thanks to their extremely short pulse durations, which confine energy absorption to the processed zone. This makes possible processing a wide range of materials with a very low heat diffusion to the region surrounding the irradiated area, ensuring a precise material ablation owing to the suppression of expanded thermal damage.


However, the implementation of ultrashort laser pulses encounters some challenges when high speeds for material removal are required. In this situation, the use of more powerful lasers for increasing ablation rates leads to undesired effects like shielding and collateral damage due to heat accumulation. In recent studies, GHz burst mode laser ablation has been proposed as a successful method to overcome this limitation by applying ablation cooling. Specifically, GHz bursts of ultrafast laser pulses can ablate the material before the residual heat induced by previous pulses diffuses away from the processed zone. At the same time, the ultrafast succession of pulses makes possible a reduction of the pulse energy needed for material ablation. Owing to that, increased ablation efficiencies have been reported.


Following this approach, we study the influence of laser irradiation parameters in burst mode laser ablation on the ablation efficiency. Each burst used in this study contains multiple pulses happening at an ultrafast repetition rate of 5 GHz. Preliminary results give evidence of the differences in ablation between GHz burst mode and conventional single pulse laser ablation. Specifically, the use of multiple pulses in one burst compared to irradiation with a single pulse resulted in a deeper and wider ablated crater, even the total accumulated energy was kept the same in both cases.

Additional Authors:
  • Juraj Sládek
    HiLASE Centre
  • Inam Mirza
    HiLASE Centre
  • Nadezhda M. Bulgakova
    HiLASE Centre
  • Kotaro Obata
  • Koji Sugioka


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