Femtosecond laser microprocessing with three-dimensionally isotropic spatial resolution using crossed-beam...

Area of Science:

• Materials Science
• Optical Engineering
• Nanotechnology

Background:

• Three-dimensional (3D) laser microprocessing is crucial for fabricating complex microstructures.
• Achieving isotropic spatial resolution in 3D laser processing remains a challenge.
• Current methods often result in anisotropic features due to laser beam asymmetry.

Purpose of the Study:

• To introduce and evaluate a novel crossed-beam irradiation system for 3D femtosecond laser microprocessing.
• To achieve three-dimensionally isotropic spatial resolution in laser-induced fabrication.
• To demonstrate the fabrication of microfluidic channels with circular cross-sections in glass.

Main Methods:

• Utilizing a crossed-beam irradiation system with two orthogonal objective lenses sharing a common focal point.
• Employing femtosecond laser pulses for material processing.
• Direct fabrication of microstructures within glass substrates.

Main Results:

• The crossed-beam geometry synthesizes an isotropic illumination volume.
• Demonstrated the ability to achieve substantially circular cross-sectional shapes for microfluidic channels.
• Successfully fabricated microfluidic channels directly inside glass.

Conclusions:

• The crossed-beam irradiation system offers a viable method for achieving isotropic spatial resolution in 3D femtosecond laser microprocessing.
• This technique facilitates the direct fabrication of high-quality, circular microfluidic channels in glass.
• The system holds potential for advanced micro-optics and lab-on-a-chip device fabrication.