Non-Diffracting Laser Beam Splitting for Faster Glass Cutting
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Solution Overview
Problem
Laser cutting systems face limitations in maintaining a tightly focused beam over a long distance due to diffraction effects, requiring high power and multiple pulses to cut through thick materials, which increases operating costs and reduces processing speed.
Innovation Solution
The use of non-diffracting beam (NDB) technology, specifically generating multiple quasi-NDB sub-beams from a single input beam, maintains high intensity and controlled spot size over a longer distance, reducing power requirements and increasing cutting speed by creating multiple damage spots per pulse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a focused Gaussian laser beam is used to maintain a tight spot size, then the spot size remains small, but the Rayleigh range becomes short, limiting the beam focus distance
Solution Approach 1:
The single laser beam is segmented into multiple sub-beams (e.g., 3-7 sub-beams) using beam splitting optics. Each sub-beam maintains a tight focus similar to a Gaussian beam, while the combined effect of multiple sub-beams extends the effective working distance and maintains high intensity over a longer propagation distance, resolving the contradiction between small spot size and long Rayleigh range.
2Length of stationary object
If nonlinear filamentation via the Kerr effect is used to maintain a tightly focused beam, then the focal range is extended, but much more power is required
Solution Approach 1:
Instead of using a single high-power beam that relies on Kerr effect filamentation, the system segments the beam into multiple lower-power sub-beams. This segmentation allows each sub-beam to maintain adequate intensity for multi-photon absorption while reducing the total power requirement compared to achieving the same effect through high-power filamentation.
Solution Approach 2:
Multiple sub-beams are combined in the focal region to achieve the desired processing effect. The merging of multiple lower-power beams creates the necessary intensity for nonlinear absorption without requiring the excessively high power levels needed for single-beam filamentation, thus extending focal range with reduced power requirements.
3Manufacturing precision
If multiple pulses are used to cut through thick material with a short Rayleigh range, then the material is cut, but the processing speed decreases
Solution Approach 1:
The laser beam is segmented into multiple sub-beams that can be focused at different depths or positions. This allows simultaneous or near-simultaneous processing at multiple locations within the material, reducing the number of pulses needed to cut through thick materials and thereby increasing processing speed while maintaining cutting completeness.
Solution Approach 2:
The system transitions from single-point sequential processing to multi-point parallel processing by using multiple sub-beams. This dimensional change from 1D (single beam path) to 2D/3D (multiple beam paths in space) enables simultaneous material removal at different locations, dramatically improving productivity without sacrificing cutting quality.
4Device complexity
If a single beam delivers one damage spot per pulse, then the system is simple, but the cutting speed is limited
Solution Approach 1:
The single beam is segmented into multiple sub-beams using relatively simple optical components such as beam splitting cubes, gratings, or spatial light modulators. This segmentation approach maintains manageable system complexity while enabling multiple damage spots per pulse, thereby increasing cutting speed without requiring a completely complex multi-laser system.
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
This approach enhances cutting speed and lowers operating costs by minimizing the number of pulses needed to cut through glass articles, while maintaining high intensity and controlled spot size, thus overcoming the limitations of traditional Gaussian beam and Kerr effect methods.
Implementation Method 1
Focused short-pulsed laser beams are used for cutting and modifying transparent substrates, such as glass, through the process of nonlinear absorption via multi-photon ionization and subsequent ablation
Implementation Method 2
Focused short-pulsed laser beams are used for cutting and modifying transparent substrates, such as glass, through the process of nonlinear absorption via multi-photon ionization and subsequent ablation
Implementation Method 3
Another approach to maintaining a tightly focused beam in a material is to use nonlinear filamentation via the Kerr effect, which yields a self-focusing phenomenon. In this process, the nonlinear Kerr effect causes the index at the center of the beam to increase, thereby creating a waveguide that counteracts the diffraction effect described above
Data Source
AI summary
Embodiments are directed to systems for laser cutting at least one glass article comprising a pulsed laser assembly and a glass support assembly configured to support the glass article during laser cutting within the pulsed laser assembly, wherein the pulsed laser assembly comprises at least one non-diffracting beam (NDB) forming optical element configured to convert an input beam into a quasi-NDB beam; and at least one beam transforming element configured to convert the quasi-NDB beam into multiple quasi-NDB sub-beams spaced apart a distance of about 1 μm to about 500 μm; wherein the pulsed laser assembly is oriented to deliver one or more pulses of multiple quasi-NDB sub-beams onto a surface of the glass article, wherein each pulse of multiple quasi-NDB sub-beams is operable to cut a plurality of perforations in the glass article.