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Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials

Zheng Fang1, Tong Zhou2, Walter Perrie1

  • 1Laser Group, School of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UK.

Materials (Basel, Switzerland)
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

A novel optical system creates pulse bursts with orthogonal polarizations, enabling simultaneous, independent multi-beam surface micro-structuring. This technique reduces ablation rates on stainless steel, enhancing parallel processing capabilities.

Keywords:
laser induced periodic surface structures (LIPSS)materials micro-structuringpulse burst processingspatial light modulatorsultrafast

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Processing

Background:

  • Ultrafast laser systems are crucial for advanced material processing.
  • Controlling polarization and spatial distribution of laser pulses is key for precision micro-structuring.
  • Existing methods often lack the flexibility for simultaneous, independent multi-beam processing.

Purpose of the Study:

  • To develop a pulse burst optical system for enhanced laser material processing.
  • To enable independent modulation and control of individual pulses within a burst.
  • To demonstrate simultaneous multi-spot surface micro-structuring with controlled polarization.

Main Methods:

  • Development of a pulse burst optical system using a delay line, beam-splitting polarizers, mirrors, and waveplates.
  • Transformation of a single high-energy pulse into a burst with orthogonal linear polarizations.
  • Utilizing two phase-only Spatial Light Modulators (SLMs) with orthogonal directors and hybrid Computer Generated Holograms (CGHs) for independent pulse modulation.
  • Synchronizing scan motion and CGH application for real-time processing.

Main Results:

  • Successfully generated pulse bursts with 323 MHz intra-burst frequency at a 5 kHz repetition rate.
  • Demonstrated simultaneous multi-spot periodic surface micro-structuring on stainless steel.
  • Achieved processing with orthogonal linear polarizations and cylindrical vector (CV) beams (Radial and Azimuthal).
  • Observed reduced ablation rates on stainless steel with pulse bursts compared to standard 5 kHz processing due to plasma absorption dynamics.
  • Showcased simultaneous independent multi-beam real-time processing using synchronized scan motion and CGH application.

Conclusions:

  • The developed pulse burst optical system offers enhanced flexibility for parallel beam surface micro-structuring.
  • Independent control over pulse polarization and spatial distribution is achieved.
  • The technique allows for adaptive optics integration, paving the way for advanced laser manufacturing applications.