Non-Diffractive Bessel Beams for Ultrafast Laser Scanning Platform and Proof-Of-Concept Side-Wall Polishing of Additively Manufactured Parts

Huu Dat Nguyen , Xxx Sedao , Cyril Mauclair , Guillaume Bidron , Nicolas Faure , Enrique Moreno , Jean-Philippe Colombier (1) , Razvan Stoian

1 LHC - Laboratoire Hubert Curien

We report the potential use of non-diffractive Bessel beam for ultrafast laser processing in additive manufacturing environments, its integration into a fast scanning platform, and proof-of-concept side-wall polishing of stainless steel-based additively fabricated parts. We demonstrate two key advantages of the zeroth-order Bessel beam: the significantly long non-diffractive length for large tolerance of sample positioning and the unique self-reconstruction property for un-disrupted beam access, despite the obstruction of metallic powders in the additive manufacturing environment. The integration of Bessel beam scanning platform is constructed by finely adapting the Bessel beam into a Galvano scanner. The beam sustained its good profile within the scan field of 35 × 35 mm 2. As a proof of concept, the platform showcases its advanced capacity by largely reducing the side-wall surface roughness of an additively as-fabricated workpiece from Ra 10 µm down to 1 µm. Therefore, the demonstrated Bessel-Scanner configuration possesses great potential for integrating in a hybrid additive manufacturing apparatus.

Mots clés: Bessel beam; non-diffractive; self-healing; ultrafast laser; surface processing; additive manufacturing; selective laser melting; laser powder bed fusion; scanner

Domaines: Optique / photonique

Huu Dat Nguyen, Xxx Sedao, Cyril Mauclair, Guillaume Bidron, Nicolas Faure, et al.. Non-Diffractive Bessel Beams for Ultrafast Laser Scanning Platform and Proof-Of-Concept Side-Wall Polishing of Additively Manufactured Parts. Micromachines, 2020, 11, ⟨10.3390/mi11110974⟩. ⟨ujm-03230416⟩