Laser Processing Device Spatial Light Modulator Y-Direction Offset
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Solution Overview
Problem
Existing laser processing apparatuses face challenges in achieving high processing quality when branching laser light into multiple rays of processing light due to interference from non-modulated light, which affects the converging state of the 0th-order light.
Innovation Solution
A laser processing apparatus and method that includes a spatial light modulator to branch laser light into multiple rays, including 0th-order light, with converging points positioned differently in the Z and X directions, and a controller to ensure the 0th-order light converging point is on one side of the non-modulated light in the Y direction, preventing interference and optimizing the converging points' alignment along a line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser light is branched into multiple rays of processing light to form multiple rows of modified regions, then processing time is reduced and productivity is improved, but non-modulated light interferes with the converging state of the 0th-order light, deteriorating manufacturing precision
Solution Approach 1:
The patent positions the converging point of the 0th-order light in a different spatial location (one side in the Y direction) relative to the converging point of non-modulated light. This spatial separation in the Y dimension prevents interference between the two light components while maintaining the multi-ray processing capability that improves productivity.
Solution Approach 2:
The patent applies different spatial positioning strategies to different rays of processing light. Specifically, the 0th-order light is positioned with its converging point offset in the Y direction from non-modulated light, while other rays are positioned at different Z and X coordinates. This localized quality differentiation ensures each ray contributes effectively to modified region formation without interference.
2Productivity
If the converging point of the 0th-order light is positioned close to the center for optimal energy distribution, then processing efficiency is improved, but interference from non-modulated light increases, reducing manufacturing precision
Solution Approach 1:
Instead of positioning both the 0th-order light and non-modulated light at the central converging point (which would maximize energy distribution but cause interference), the patent offsets the 0th-order light's converging point in the Y direction. This dimensional separation maintains processing efficiency while eliminating interference, resolving the contradiction between productivity and precision.
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 processing quality by minimizing the impact of non-modulated light on the converging state of the 0th-order light, allowing for precise control of converging points and improved fracture extension in the processed material.
Implementation Method 1
a spatial light modulator configured to modulate the laser light emitted from the light source
Implementation Method 2
a converging part configured to converge the laser light modulated by the spatial light modulator from the second surface side to the object
Data Source
AI summary
A laser processing apparatus includes a support part, a light source, a spatial light modulator, a converging part, and a controller. The controller controls the spatial light modulator so that laser light is branched into a plurality of rays of processing light including 0th-order light and a plurality of converging points for the plurality of rays of processing light are located at positions different from each other in a Z direction and an X direction, and controls at least one of the support part and the converging part so that the X direction coincides with an extension direction of a line and the plurality of converging points move relatively along the line. The controller controls the spatial light modulator so that a converging point of the 0th-order light is located one side with respect to a converging point of non-modulated light of the laser light, in a Y direction.