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Utilizing a Diffractive Focus Beam Shaper to Enhance Pattern Uniformity and Process Throughput during Direct Laser
Mikhael El-Khoury1, Bogdan Voisiat1, Tim Kunze2
1Institute for Manufacturing Technology, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, Germany.
Materials (Basel, Switzerland)
|January 21, 2022
Summary
Direct Laser Interference Patterning (DLIP) challenges were overcome using a top-hat beam shape, creating deeper and more uniform microstructures. This method enhances microstructure quality and increases process throughput for large-area applications.
Area of Science:
- Materials Science
- Optical Engineering
- Laser Processing
Background:
- Direct Laser Interference Patterning (DLIP) typically uses Gaussian laser beams, leading to challenges in achieving uniform microstructures over large areas.
- The inherent intensity distribution of Gaussian beams limits control over microstructure uniformity and depth.
Purpose of the Study:
- To investigate the use of a diffractive fundamental beam-mode shaper (FBS) to create a top-hat intensity distribution in a four-beam DLIP setup.
- To compare the microstructure formation, process throughput, and homogeneity achieved with top-hat versus Gaussian intensity distributions.
Main Methods:
- Implementation of a diffractive fundamental beam-mode shaper (FBS) in a four-beam DLIP optical setup.
- Measurement and comparison of interference patterns generated by standard (Gaussian) and modified (top-hat) configurations.
- Evaluation of microstructure height, height error, and process throughput on the structured surface.
Main Results:
- The top-hat intensity distribution produced on average 44.8% deeper microstructures with up to 60% higher homogeneity at the same throughput compared to the Gaussian distribution.
- The presented approach enabled microstructure production with comparable height and homogeneity to the Gaussian distribution but with a 53% increase in throughput.
Conclusions:
- Utilizing a top-hat intensity distribution via beam shaping significantly improves microstructure depth and homogeneity in DLIP.
- The developed method offers a viable strategy to enhance DLIP efficiency and quality for large-area microstructure fabrication.
