Polarization-Switched Laser Beam Splitting for Stable Wobble Processing
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Solution Overview
Problem
Current laser processing technologies require complex and elaborate optics structures for wobble movements during material separation and joining, which complicates the adjustment and stability of processing optics.
Innovation Solution
A device that uses a polarization switch and a polarization beam splitter to split a laser beam into two orthogonal partial beams, which are then focused into different focal zones within the workpiece, allowing for alternate maximization of laser intensity and mimicking a wobble movement without moving the processing optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If periodic movement of processing optics is used for wobble movement, then high-quality edges are generated in separation or joining seams, but the structure of processing optics becomes complicated and adjustment becomes elaborate
Solution Approach 1:
The patent replaces the mechanical wobble movement system (moving processing optics) with an optical field modulation system using polarization switching. The polarization switch modulates the polarization state of the laser beam to create alternating intensity distribution in the focal zone, achieving the wobble effect without mechanical movement. This substitution eliminates the complexity of mechanical wobble mechanisms while maintaining the edge quality benefits.
Solution Approach 2:
The patent changes the polarization parameter of the laser beam using a polarization switch, which alternately maximizes the intensity of different polarization components. By switching between different polarization states (e.g., s-polarization and p-polarization), the system creates temporal intensity modulation in the focal zone that mimics spatial wobble movement, achieving high-quality edges without mechanical complexity.
2Manufacturing precision
If processing optics are moved periodically for wobble movement, then material separation and joining quality is improved, but mechanical stability of processing optics is reduced
Solution Approach 1:
The patent eliminates mechanical movement of processing optics by substituting it with optical field modulation through polarization switching. The polarization switch changes the polarization state of the laser beam temporally, creating an effective wobble in the focal zone without any mechanical displacement. This maintains the mechanical stability of the processing optics while achieving the same quality improvement in separation and joining.
3Manufacturing precision
If complex optics structure is used for wobble movement, then processing quality is enhanced, but ease of operation is reduced
Solution Approach 1:
The patent replaces complex mechanical wobble adjustment mechanisms with a simple polarization switch control system. The polarization switch can be controlled electronically to alternate between different polarization states, eliminating the need for complex mechanical adjustments. This significantly improves ease of operation while maintaining processing quality.
Solution Approach 2:
The patent introduces dynamic polarization switching to create a temporally modulated optical field that effectively produces spatial wobble. The polarization switch dynamically alternates between different polarization states at controlled frequencies, creating the wobble effect without any mechanical movement. This dynamic optical control is much simpler to operate than static mechanical wobble mechanisms.
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 simplifies the structure and enhances mechanical stability of the processing optics, enabling high-quality edges in separation or joining seams with improved processing efficiency and reduced mechanical complexity.
Implementation Method 1
a polarization switch configured to switch the polarization of the laser beam between two polarization states and/or to rotate the polarization of the laser beam
Implementation Method 2
a polarization beam splitter configured to split the laser beam into a first partial laser beam and a second partial laser beam. The first partial laser beam has a first polarization state. The second partial laser beam has a second polarization state orthogonal to the first polarization state
Implementation Method 3
processing optics configured to introduce the first partial laser beam into the workpiece in a first focal zone and the second partial laser beam into the workpiece in a second focal zone
Implementation Method 4
the short pulse length and high pulse peak power, or the high pulse energy, can lead to nonlinear absorption of the pulse energy in the material of a workpiece
Data Source
AI summary
A device for processing a workpiece includes a laser configured to emit a laser beam, a polarization switch configured to switch the polarization of the laser beam between two polarization states and/or to rotate the polarization of the laser beam, a polarization beam splitter configured to split the laser beam into two partial laser beams with mutually orthogonal polarization states. A first partial laser beam has a first offset and a second partial laser beam has a second offset after passing through the polarization beam splitter. The device further includes processing optics configured to introduce the two partial laser beams into the workpiece in two focal zones, in order to process the workpiece. The polarization switch is arranged before the polarization beam splitter in a beam propagation direction. The switching and/or the rotation of the polarization by the polarization switch alternately maximize intensities of the two partial laser beams.