About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Passive Intensity Modulation Of Light In A Microscale Selective Laser Sintering System For Enhanced Part Uniformity |
Author(s) |
Aaron Liao, Joshua Grose, Heejin Kim, Michael Cullinan, Chinedum Okwudire |
On-Site Speaker (Planned) |
Aaron Liao |
Abstract Scope |
Microscale selective laser sintering (μ-SLS) aims to fabricate sub-5 μm features with a high throughput for the advanced semiconductor packaging industry, where fine resolution features are required. In μ-SLS, a metal nanoparticle bed is heated with laser projection masks from a digital micromirror device (DMD). As sintering progresses, unwanted heat conduction to areas outside of the mask occurs, reducing process resolution. Additionally, optical vignetting and DMD defects produce nonuniform intensity across the frame. A beam profiler was used to determine a field correction for spatial nonuniformity across the projected area. This was combined with a control framework based on a finite difference model to optimize a series of masks. A Python script was used to display these masks in sequence, leveraging the full spatiotemporal modulation capabilities of the DMD and enhancing process resolution across the exposure area. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |