Silicon wafer laser cutting and scribing machines use focused laser beams to process materials locally. They can be used to cut or scribe semiconductor materials such as silicon, germanium and gallium arsenide, as well as certain metals, ceramics and aluminum foil. An optical system directs the laser to the target location, while a computer controlled motion stage follows the programmed processing path. Depending on the material, cutting depth and product requirements, the process may use surface ablation, laser grooving or internal modification.
Equipment Overview
Laser cutting and scribing machines are used to separate workpieces or create predefined separation paths. Unlike mechanical blade cutting, laser processing does not require direct contact between a cutting tool and the workpiece, reducing the mechanical load applied during processing.
These machines can process semiconductor wafers, solar cells, ceramic sheets, aluminum foil and selected metal materials. Each material has different requirements for laser wavelength, output power and processing parameters. The machine configuration must therefore match the material composition, thickness and required cutting quality.
Under suitable processing conditions, laser systems can produce narrow cuts and good edge quality. However, laser processing can still cause heat affected zones, resolidified material or microcracks. The results depend on the processing method and the selected parameters.
How Laser Cutting and Scribing Work
Laser Focusing and Material Interaction
A dedicated optical system focuses the laser beam onto the workpiece surface or inside the material, concentrating energy within a small spot. The interaction between the laser and the material can remove material through localized heating, melting, vaporization or ablation.
The specific mechanism depends on the laser type, wavelength, pulse parameters and the optical and thermal properties of the material. Processing parameters must be selected for the target material to control cutting depth, edge quality and thermal effects.
Different Laser Processing Methods
Laser cutting and surface ablation
This method concentrates laser energy along a predefined cutting path to remove material and form a groove or cut. Depending on the required depth and process conditions, the operation may involve surface grooving or full cutting. It can be used for semiconductor materials such as silicon and gallium arsenide, along with other materials compatible with the selected laser process.
Laser scribing
Laser scribing typically creates a narrow groove or scribe line along a predefined separation path. The workpiece is then separated along that path through a subsequent process, such as mechanical breaking. Scribe depth and path design depend on material thickness, component structure and separation requirements.
Laser stealth dicing
Some semiconductor wafer systems use internal modification rather than direct surface ablation. The laser is focused inside the silicon wafer to form a modified layer and initiate cracking. A subsequent process, such as tape expansion, separates the wafer along the predefined path.
This method differs from surface ablation, which removes material to create a cut or groove. Stealth dicing is suitable only for materials and product structures that support internal laser modification.
Computer Control and Motion Platform
Laser cutting machines typically use computer numerical control and a two dimensional motion stage. The system follows programmed geometry or tool paths to control the relative movement between the laser beam and workpiece, enabling straight lines, curves and other specified contours.
Processing accuracy and speed depend on the positioning performance of the motion stage, laser output characteristics, optical system, material thickness and process parameters. Output power and scanning speed must be matched to the application. Increasing laser power alone does not guarantee better processing quality.
Equipment Selection and Processing Quality
When selecting a silicon wafer laser cutting or scribing machine, the main considerations include material type, workpiece thickness, required cutting or scribing depth, path accuracy and allowable edge defects. For semiconductor wafers, the evaluation may also cover chipping, microcracks, heat affected zones and kerf width.
Different laser processes have different application limits. Surface ablation removes material directly, while laser scribing creates a predefined separation path. Stealth dicing requires the material to support internal laser modification. The equipment and process should be selected according to the actual product requirements.
Custom Machining of Supporting Components
Laser processing equipment also requires mounting bases, connecting flanges, positioning fixtures and other precision structural components. We manufacture custom non-standard parts according to customer supplied drawings, following the confirmed dimensions, tolerances and assembly requirements.
Hansheng Automation also provides drawing based precision machining for other industries, including tobacco packaging machinery parts, filling machinery components, yacht precision parts and structural components for remote controlled racing cars. Components can be manufactured to customer drawings and actual assembly requirements.
