Laser Material Processing via Interaction Zone Overlap
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Solution Overview
Problem
Current laser surgical methods require defined sequences of optical breakthroughs to prevent plasma bubbles from joining, which complicates the production of high-quality cuts and increases the risk of collateral damage, necessitating high pulse energy and protective measures.
Innovation Solution
The solution involves minimizing the distance between centers of interaction to reduce pulse energy, allowing for overlapping zones of interaction to achieve material separation without forming large plasma bubbles, and using lasers of lower hazard class, enabling more precise and safer cutting with reduced collateral damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pulse energy is used to prevent plasma bubbles from joining, then cut quality is improved, but personnel hazard increases and collateral damage risk increases
Solution Approach 1:
The patent changes the pulse energy parameter from high to low levels, enabling the use of laser class 1M instead of higher hazard classes. This parameter change maintains cut quality while significantly reducing personnel hazard and collateral damage risk.
Solution Approach 2:
The patent converts the previously harmful effect of plasma bubble formation into a beneficial control mechanism. By allowing controlled plasma bubble formation at low pulse energies and preventing their joining through optimized pulse sequences, the system achieves high-quality cuts with enhanced safety.
2Manufacturing precision
If defined sequences of optical breakthroughs are used to prevent plasma bubbles from joining, then cut quality is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the processing sequence by changing the pulse energy parameter to low levels, which naturally prevents plasma bubble joining without requiring complex defined sequences. This reduces device complexity while maintaining cut quality.
3Productivity
If high pulse energy is used to achieve material separation, then cutting speed is improved, but collateral damage increases
Solution Approach 1:
The patent changes the pulse energy parameter from high to low, eliminating collateral damage while maintaining productive cutting speed through optimized pulse sequences that prevent plasma bubble joining.
Solution Approach 2:
The patent converts the potential harm of plasma bubble formation into a beneficial control mechanism. By using low pulse energies that naturally limit plasma bubble growth and preventing their joining, the system achieves fast cutting without collateral damage.
4Use of energy by moving object
If overlapping zones of interaction are used to achieve material separation, then pulse energy is reduced, but precision requirements increase
Solution Approach 1:
The patent changes the pulse energy parameter to low levels and uses overlapping zones of interaction, which requires precise positioning but is achieved through controlled pulse sequences that maintain safety margins.
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 results in finer cuts with reduced plasma bubble formation, lower personnel hazards, and improved cut quality, allowing for the use of safer lasers, such as class 1M, while maintaining precision and control over the cutting process.
Implementation Method 1
the laser pulse energy is usually selected such that an optical breakthrough in the tissue forms in the zone of interaction
Implementation Method 2
First, the optical breakthrough generates a plasma bubble in the material
Implementation Method 3
If a plasma is generated at a material interface which may even be located within a material structure, material removal is effected from said interface. This is then referred to as photoablation
Implementation Method 4
In case of a plasma bubble separating previously connected material layers, one usually speaks of photodisruption
Data Source
AI summary
In a device for material processing by means of laser radiation, said device comprising a source of laser radiation emitting pulsed laser radiation for interaction with the material; optics focusing the pulsed processing laser radiation to a center of interaction in the material; a scanning unit shifting the positions of the center of interaction within the material, wherein each processing laser pulse interacts with the material in a zone surrounding the center of interaction assigned to said laser pulse so that material is separated in the zones of interaction; and a control unit which controls the scanning unit and the source of laser radiation such that a cut surface is produced in the material by sequential arrangement of zones of interaction, it is envisaged that the control unit controls the source of laser radiation and the scanning unit such that adjacent centers of interaction are located at a spatial distance a ≦10 μm from each other.