Wisconsin Alumni Research Foundation

Engineering
Engineering
CORE-RING-RING LASER
WARF: P260025US01

Inventors: Lianyi Chen, Ali Nabaa, Jiandong Yuan


The Invention

UW-Madison researchers have developed a tailored multi-zone beam profile that addresses the instabilities characteristic of Laser Powder Bed Fusion (LPBF) processes in order to achieve defect-free, repeatable builds across a wide processing window. The novel laser profile consists of three concentric zones (a low power narrow core encircled by two annular rings), each engineered for a distinct melt-pool function. In the central core, a sharply peaked Gaussian initiates a pilot narrow keyhole and then yields to define the keyhole centerline. The 1st ring carries a higher-intensity Gaussian that bathes the keyhole walls, stabilizing vapor‐plume dynamics and preventing keyhole collapse or irregular deepening. The 2nd ring, delivers a low‐amplitude Gaussian skirt that gently pre-sinters the surrounding powder, suppressing spatter, evening out powder-bed packing, and reducing layer-to-layer thickness variations. This structured beam facilitates more controlled melt pool behavior and layer-to-layer consistency. Deploying this “core–ring–ring” architecture via diffractive optics or a spatial-light modulator yields melt tracks with virtually no porosity, minimal spatter, and robust immunity to variations in powder bed thickness and surface topology.

Additional Information
For More Information About the Inventors
For current licensing status, please contact Michael Carey at [javascript protected email address] or 608-960-9867

WARF