Vector scanning subtractive manufacturing technology for laser rapid fabrication.

Area of Science:

• Optics and Photonics
• Materials Science
• Manufacturing Engineering

Background:

• Traditional methods for fabricating micro-optical components often face limitations in speed, efficiency, and structural integrity.
• Raster scanning techniques can lead to stress buildup and crack formation in processed materials.
• There is a need for advanced manufacturing technologies to produce complex 3D micro-optics with high precision and smooth surfaces.

Purpose of the Study:

• To propose and demonstrate a novel vector scanning subtractive manufacturing technology for fabricating smooth micro-optical components.
• To enhance processing efficiency and mitigate stress-related defects compared to existing methods.
• To showcase the fabrication capabilities for diverse 3D micro-structures with controlled dimensions and morphologies.

Main Methods:

• Utilizing a vector scanning method combined with wet etching for subtractive manufacturing.
• Applying the technology to fabricate micro-optical components on sapphire substrates.
• Characterizing the fabricated 3D micro-structures, including dimensions and surface roughness.

Main Results:

• Achieved processing efficiency nearly two orders of magnitude higher than raster scanning methods.
• Successfully mitigated stress buildup around laser-processed regions, preventing crack generation.
• Flexibly fabricated micro-concave lenses (20-140 µm diameter, 10-70 µm height) with a surface roughness of 29 nm on sapphire.

Conclusions:

• The developed vector scanning subtractive manufacturing technology offers a rapid and efficient approach for producing smooth 3D micro-optical components.
• The technology demonstrates significant advantages over traditional methods, particularly in terms of speed and defect avoidance.
• This technique holds substantial promise for applications in monolithic integrated 3D all-solid-state micro-optics.