Laser Processing Optics for Partial Beam Focus Alignment
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Solution Overview
Problem
Existing processing optical units for laser workpiece processing struggle to simultaneously achieve the desired alignment and positioning of partial beams relative to the optical axis, as a single polarizer element cannot produce both the intended angle and position offsets simultaneously, leading to suboptimal focusing of laser beams onto workpieces.
Innovation Solution
Incorporating a further optical element downstream of the birefringent polarizer element in the beam path to adjust the angle and/or distance of the partial beams relative to the optical axis, allowing for precise alignment and positioning of the beams, which can include using birefringent and isotropic optical elements to control the beam offsets and ensure alignment during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single birefringent polarizer element is used to split the laser beam, then the beam is divided into two partial beams with different polarization states, but the desired angle and position offsets relative to the optical axis cannot be achieved simultaneously
Solution Approach 1:
The single polarizer element is segmented into multiple functional components: a first birefringent polarizer element for beam splitting, and a second optical element (prism or wedge) for additional angle and position offset correction. This segmentation allows each element to perform a specific function, achieving precise alignment that cannot be obtained with a single element.
Solution Approach 2:
A second optical element acts as an intermediary between the first polarizer element and the workpiece. This intermediary component compensates for the insufficient angle and position offsets produced by the first element alone, enabling precise positioning of partial beams on the optical axis without directly modifying the polarizer element itself.
2Adaptability or versatility
If the processing optical unit is rotated to change the preferred direction, then different processing directions can be achieved, but undesired offsets of partial beams from the optical axis occur
Solution Approach 1:
The second optical element is designed with asymmetric geometry (prism or wedge shape) that compensates for the symmetric rotation of the entire processing optical unit. This asymmetric design ensures that when the unit rotates to change processing directions, the partial beams remain properly positioned on the optical axis without undesired offsets.
Solution Approach 2:
The second optical element pre-compensates for the positioning errors that would occur during rotation. By introducing a predetermined angle offset through the prism or wedge, the system counteracts the undesired beam displacement that would naturally occur when rotating the processing optical unit, maintaining precision across different processing directions.
3Ease of operation
If the angle offset at the polarizer element is increased to improve beam separation, then the positioning precision of partial beams on the optical axis deteriorates
Solution Approach 1:
The system uses a two-stage angle offset approach where the first polarizer element provides a fixed angle offset for beam separation, and the second optical element provides an adjustable or compensating angle offset. This dynamic configuration allows optimization of both beam separation and positioning precision, as the second element can be adjusted to correct positioning errors while maintaining adequate separation.
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 configuration enables precise alignment and positioning of partial beams, preventing undesired offsets during rotation and allowing for the production of defined focus zones, enhancing the accuracy and efficiency of laser processing techniques such as cutting, structuring, and welding.
Implementation Method 1
a birefringent polarizer element for splitting at least one, in particular pulsed, input laser beam into at least two partial beams each having one of two different polarization states
Implementation Method 2
a focusing optical unit arranged downstream of the polarizer arrangement in the beam path and serving for focusing the partial beams onto at least two focus zones
Data Source
AI summary
A processing optical unit for workpiece processing includes a polarizer arrangement comprising a birefringent polarizer element for splitting at least one input laser beam into at least two partial beams each partial beam having one of two different polarization states, and a focusing optical unit arranged downstream of the polarizer arrangement in the beam path and configured to focus the partial beams onto at least two focus zones. The polarizer arrangement has a further optical element arranged downstream of the birefringent polarizer element in the beam path and configured to change an angle and/or a distance of at least one of the partial beams relative to an optical axis of the processing optical unit.