Laser Powder Bed Fusion (LPBF) is a critical additive manufacturing process for producing complex parts with high accuracy and precision. However, LPBF faces significant challenges in increasing the process yield and printing new powders while reducing hot cracking. These challenges limit the production speed, reduce the manufacturing efficiency, and restrict the range of materials that can be used in LPBF.
Beam shaping offers a potential solution to overcome these challenges by modifying the laser beam's intensity distribution. In this paper, we explore the application of Multi-Plane Light Conversion (MPLC) to LPBF to improve the process speed and quality. MPLC is a novel beam-shaping technique that enables the creation of complex intensity profiles by redirecting the laser beam through multiple planes of phase modulators.
Our study demonstrates the successful application of MPLC to LPBF, enabling a significant increase in the process speed while maintaining high-quality parts. We use an appropriate ring shape for printing the inner part and a small Gaussian beam for the contour of the part. We compare the performance with no beam shaping as well as with beam shaping based on shaping within the fiber of the laser technology. Our results show that MPLC-based beam shaping improves the process yield, leading to faster printing and improved manufacturing efficiency.