Parallel femtosecond laser ablation with individually controlled intensity.

Area of Science:

• Optics and Photonics
• Laser Technology
• Materials Science

Background:

• Spatial light modulators (SLMs) are typically used to split laser beams into multiple beams of equal intensity.
• Advanced holographic techniques offer greater control over individual beam properties.

Purpose of the Study:

• To demonstrate a method for designing computer-generated holograms for highly parallel laser micromachining with individually controlled beam intensities.
• To showcase the application of this technique in laser ablation of grayscale images.

Main Methods:

• Utilizing computer-generated holograms with spatial light modulators (SLMs) to split a single laser beam into multiple beams.
• Designing a hologram for generating 400 individual laser beams with controllable intensities.
• Applying femtosecond laser ablation to engrave grayscale images, mapping pixel grayscale values to beam intensities.

Main Results:

• Successfully generated 400 individually intensity-controlled laser beams from a single source using holographic techniques.
• Demonstrated the precise ablation of grayscale images by correlating pixel intensity with laser beam power.
• Validated the capability of the proposed method for high-throughput, high-resolution laser micromachining.

Conclusions:

• Computer-generated holograms combined with SLMs provide a powerful tool for advanced laser micromachining.
• Individual control over laser beam intensity opens new possibilities for applications such as grayscale image processing and fabrication.
• The presented technique offers a scalable solution for parallel laser processing with precise intensity modulation.