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Poster

Student Homogeneous intensity within the Rayleigh length and enhanced depth of focus for Gaussian beams

Wednesday (24.06.2020)
12:14 - 12:17 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


Pulsed solid-state lasers are well established for many micro machining processes and typically provide high quality Gaussian laser beams which are focused onto the material for the processing. The width of the focused Gaussian beam changes continuously during the propagation, but the principle intensity distribution is retained. At the focal plane, the width shows the smallest size, which is called the waist and is only limited by the diffraction limit of the light. The waist results from the divergence in front of and behind the focal plane and determines the Rayleigh length. The Rayleigh length is the distance from the waist at which the width of the Gaussian beam increases by a factor of 1.41 or the intensity decreases by a factor of 2. With regard to laser material processing, these changes in spot size and intensity are typically undesirable. For example, variations in surface profiles or thickness of the processed material could require adjustment of focus.

We present a new beam shaping method for Gaussian laser beams based on a development of the Fundamental Beam Mode Shaper (FBS) concept. By applying the new phase information to the Gaussian beam, the caustic of a focused Gaussian beam is changed. Within the Rayleigh length the focused beam shows now almost constant intensity. In addition, the depth of focused increases by 30% in comparison to the Rayleigh length of the Gaussian beam.

The homogeneous intensity within the Rayleigh length and the higher depth of focus realized by this new beam shaping has the potential to enhance the stability of laser machining processes, to improve the process window and to simplify the process control.

Speaker:
Christian Bischoff
Topag Lasertechnik GmbH
Additional Authors:
  • Dr. Erwin Jäger
    Topag Lasertechnik GmbH
  • Dr. Udo Umhofer
    Topag Lasertechnik GmbH
  • Dr. Andrés Fabián Lasagni
    Technische Universität Dresden

Dateien

Category Short file description File description File Size
Poster Version1 for printed booklet and and web site 622 KB Download
Poster presentation A0 final poster 2 MB Download