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Updated: Mar 25, 2026
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
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Imaging-based amplitude laser beam shaping for material processing by 2D reflectivity tuning of a spatial light
Applied Optics
|February 25, 2016
Summary
This study presents a novel laser beam shaping method for material processing using a spatial light modulator. The technique achieves precise control over laser intensity profiles, improving ablation accuracy and efficiency.
Area of Science:
- Optics and Photonics
- Materials Science
- Laser Technology
Background:
- Precise control over laser beam profiles is crucial for advanced material processing.
- Existing beam shaping methods can be limited in resolution and flexibility.
Purpose of the Study:
- To demonstrate an imaging-based laser beam shaping technique for material processing.
- To achieve precise control over both the outline and internal intensity distribution of a laser beam.
Main Methods:
- Utilized a spatial light modulator (SLM) with 256 gray levels for 2D reflectivity tuning.
- Designed intensity masks to shape the laser beam's profile and internal intensity.
- Reconstructed shaped beam profiles (squared and circular flattop) at an image plane using an f-theta lens.
Main Results:
- Achieved uniform intensity distribution within the shaped beam, superior to binary mask methods.
- Demonstrated accurate ablation footprints that closely matched the designed beam shapes.
- Successfully shaped laser beams into squared and circular flattop profiles.
Conclusions:
- The developed imaging-based laser beam shaping technique offers enhanced precision for material processing.
- The use of gray-level masks on SLMs provides superior control over laser beam intensity profiles.
- This method enables more accurate and efficient material ablation by matching the beam shape to the desired footprint.
