Beta Gallium Oxide Substrate Laser Separation
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Solution Overview
Problem
The existing methods for manufacturing β gallium oxide substrates using wire saws result in low productivity due to significant material wastage, with approximately 60% to 70% of the workpiece being discarded as cutting allowance.
Innovation Solution
A β gallium oxide substrate manufacturing method that involves forming a separation layer inside the workpiece using a laser beam, with the focal point positioned at a predetermined depth, creating a modified part and a crack that serves as a starting point for substrate separation when an external force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wire saw cutting method is used to manufacture substrate from workpiece, then substrate can be obtained with predetermined thickness, but 60% to 70% of the workpiece is discarded as cutting allowance resulting in low productivity
Solution Approach 1:
The patent replaces the mechanical wire saw cutting system with a laser-based separation system. The laser beam creates a separation layer inside the workpiece by melting and vaporizing material along a predetermined path, eliminating the need for mechanical cutting. This substitution allows for internal separation without removing large portions of the workpiece, thereby improving productivity while maintaining substrate thickness precision.
Solution Approach 2:
The patent applies laser irradiation in advance to create a separation layer and internal cracks within the workpiece before actual substrate separation is needed. This preliminary action weakens the internal structure along the desired separation path, making subsequent substrate extraction easier and more efficient, thus improving overall manufacturing productivity without compromising precision.
2Manufacturing precision
If wire saw cutting method is used, then substrate separation can be achieved, but significant material wastage occurs with 60% to 70% cutting allowance
Solution Approach 1:
The patent replaces mechanical wire saw cutting with laser irradiation that creates internal separation layers. The laser beam melts and vaporizes material along a precise three-dimensional path inside the workpiece, forming a separation layer that requires minimal material removal. This eliminates the need for large cutting allowances required by wire saw methods, significantly reducing material wastage while maintaining separation accuracy.
Solution Approach 2:
The patent transitions from two-dimensional surface cutting (wire saw) to three-dimensional internal separation (laser irradiation). By focusing the laser beam at predetermined depths and positions within the workpiece, the separation layer is created internally rather than through surface removal. This dimensional change allows for precise substrate separation with minimal material loss, as the separation occurs within the bulk material rather than through extensive surface cutting.
3Productivity
If laser beam is applied with focal point at predetermined depth to form separation layer, then productivity is enhanced, but process complexity increases compared to wire saw method
Solution Approach 1:
The patent replaces the relatively simple mechanical wire saw system with a laser processing system capable of three-dimensional positioning and focal depth control. While this increases device complexity, it enables internal separation layer formation that dramatically improves productivity by eliminating large cutting allowances and enabling more efficient material utilization. The complexity is justified by the significant productivity gains achieved.
Solution Approach 2:
The patent utilizes precise control of laser parameters including wavelength, pulse duration, power, and focal depth to optimize the separation process. By adjusting these parameters, the laser can selectively melt and vaporize material at specific depths and positions within the workpiece, forming the separation layer efficiently. This parameter control, while adding complexity, enables the high productivity benefits of internal separation without requiring overly complex system architecture.
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 method enhances productivity by reducing material wastage and allowing for more efficient substrate separation compared to traditional wire saw methods.
Implementation Method 1
applying a laser beam of such a wavelength as to be transmitted through the β gallium oxide to the workpiece, in a state in which a focal point where the laser beam is concentrated is positioned at a predetermined depth from a front surface of the workpiece
Implementation Method 2
to form a separation layer including a modified part and a crack extending from the modified part, inside the workpiece
Implementation Method 3
to form a separation layer including a modified part and a crack extending from the modified part, inside the workpiece
Data Source
AI summary
A β gallium oxide substrate manufacturing method for manufacturing a substrate from a workpiece formed of β gallium oxide includes a separation layer forming step of applying a laser beam of such a wavelength as to be transmitted through the β gallium oxide to the workpiece, with a focal point of the laser beam positioned at a predetermined depth from a front surface of the workpiece, to thereby form a separation layer including a modified part and a crack extending from the modified part, inside the workpiece, and a separation step of exerting an external force on the workpiece to thereby separate the substrate from the workpiece with the separation layer as a start point, after the separation layer forming step.