Using phase-corrected Bessel beams to cut glass substrates with a chamfered edge

Area of Science:

• Materials Science
• Optics and Photonics
• Laser Physics

Background:

• Ultrafast laser processing offers high precision for materials like glass.
• Achieving angled cuts, especially chamfers, requires precise control over laser-matter interaction.
• Standard laser beams can aberrate when cutting tilted materials, compromising cut quality.

Purpose of the Study:

• To demonstrate ultrafast laser cutting of glass at an oblique angle using a phase-corrected Bessel beam.
• To investigate beam shaping techniques for consistent chamfering of glass substrates.
• To achieve controlled separation of glass with a chamfered edge.

Main Methods:

• Utilized phase-corrected Bessel beams for laser cutting.
• Employed simulations to determine optimal beam phase for propagation in a tilted substrate.
• Implemented beam shortening, intensity repositioning, and elliptical focal spot formation.
• Combined three laser cuts to form a chamfered damage tract.
• Used a carbon dioxide (CO2) laser for final material separation.

Main Results:

• Successfully demonstrated oblique angle ultrafast laser cutting of glass.
• Achieved consistent chamfering through precise beam control and simulation-guided phase correction.
• Produced a chamfered edge on the glass substrate after laser-induced separation.

Conclusions:

• Phase-corrected Bessel beams are effective for high-precision, oblique laser cutting of glass.
• Beam shaping strategies are crucial for creating complex features like chamfers.
• This technique advances laser processing for creating specialized edges on brittle materials.