Axicon Bessel Beam Cutting for Clean Transparent Material Processing
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Solution Overview
Problem
Existing laser-based cutting systems for transparent materials, such as glass, often produce debris and a heat-affected zone that compromise the quality of cuts and damage surrounding areas, due to high aberration and heat distribution issues.
Innovation Solution
A Bessel beam cutting system utilizing an ultrafast laser light source, an axicon, and multiple lenses to generate a Bessel beam that vaporizes material within a controlled depth of field, minimizing debris and heat impact, thereby improving cut quality and reducing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser-based cutting systems are used to cut transparent materials, then the cutting process can be performed, but debris and heat-affected zones are generated that compromise cut quality and damage surrounding areas
Solution Approach 1:
The patent changes the fundamental parameters of the laser beam by generating a Bessel beam instead of a conventional Gaussian beam. This Bessel beam configuration creates a non-diffracting beam with an extended depth of field, allowing the laser energy to be distributed along a longer propagation path rather than concentrated at a single focal point, thereby reducing heat accumulation and debris generation at any single location
Solution Approach 2:
The invention transitions from conventional two-dimensional focal spot cutting to three-dimensional volumetric processing by creating an elongated focal region along the beam propagation direction. The Bessel beam's extended depth of field enables simultaneous modification of material throughout a volumetric region, distributing thermal energy more evenly and reducing localized heat-affected zones
2Productivity
If high energy concentration is used to cut transparent materials, then cutting efficiency is improved, but heat distribution issues cause damage to surrounding areas
Solution Approach 1:
The patent modifies the energy distribution parameters by using a Bessel beam with a specific axial intensity profile. The beam parameters (such as the first zero position and depth of field) are optimized to achieve adequate energy concentration for efficient cutting while extending the interaction length, thereby distributing heat over a larger volume and reducing thermal damage to surrounding areas
3Manufacturing precision
If conventional laser beams are used, then the system structure is simple, but high aberration reduces cutting precision
Solution Approach 1:
The patent introduces a Bessel beam generation module as an intermediary optical system between the laser source and the workpiece. This module includes specific optical elements (such as axicons or spatial light modulators) that transform the conventional Gaussian beam into a Bessel beam, thereby correcting aberration issues and improving cutting precision while adding controlled complexity to the optical path
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively cuts transparent materials with reduced debris and heat-affected zones, enhancing the precision and cleanliness of the cutting process while minimizing damage to surrounding areas.
Implementation Method 1
the axicon configured to diffract the beam into a first Bessel beam in a near field of the axicon and an annular beam in a far field of the axicon
Implementation Method 2
a first lens configured to focus the annular beam
Implementation Method 3
a second lens configured to converge the focused annular beam into a second Bessel beam to modify a transparent material
Data Source
AI summary
A Bessel beam laser-cutting system may comprise an ultrafast laser light source, an axicon, a first lens, and a second lens. The ultrafast light source may be configured to emit a beam into the axicon. The axicon may be configured to diffract the beam into a first/primary Bessel beam in a near field of the axicon and an annular beam in a far field of the axicon. The first lens may be configured to focus the annular beam. The second lens may be configured to converge the focused annular beam into a second/secondary Bessel beam to modify a transparent material, wherein a modification depth of the modification generated by the second/secondary Bessel beam is to be within a range of tens of micrometers to several millimeters inside the transparent material.