All-optical, self-focused laser beam array for parallel laser surface processing.

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Single femtosecond laser beams offer precise material surface processing.
• Low processing efficiency of single beams limits widespread application.
• Need for scalable and efficient femtosecond laser surface modification techniques.

Purpose of the Study:

• To demonstrate a novel method for high-efficiency, parallel femtosecond laser surface processing.
• To enable millimeter-scale processing using an array of self-focusing laser beams.
• To explore applications in fabricating nanoscale structures for improved device performance.

Main Methods:

• Utilizing an array of high-intensity femtosecond laser beams.
• Inducing self-focusing of laser beams within a glass medium.
• Conducting experimental and simulation analyses of laser fluence and beam characteristics.
• Fabricating nanoscale structures on silicon surfaces.

Main Results:

• Achieved an array of self-focused high-intensity femtosecond laser beams.
• Demonstrated parallel processing capability over millimeter scales.
• Confirmed laser fluence exceeding 1.2 J/cm² for each beamlet, suitable for micro/nanostructure processing.
• Successfully generated nanoscale structures on silicon surfaces.

Conclusions:

• The self-focusing femtosecond laser array enables high-efficiency, large-area surface processing.
• This technique is suitable for micro- and nanostructure fabrication.
• Potential to significantly improve the efficiency of black silicon fabrication for photovoltaic devices.