Product Code: ICA10_302

Laser Drilling in Ablation Regime : Study of Drilling Velocity with Decoupled Q-Switch Laser
Authors:
Laurent Berthe, Laboratoire Procédés et Inginièrie en matériaux et Mécanique, UPR CNRS 8006; Paris Cedex France
Matthieu Schneider, Laboratoire PIMM Procédé et Ingénierie en Mécanique et Matériaux CNRS/ Arts et Métiers Paristech UPR 8006; Paris France
Maryse Muller, Laboratoire PIMM Procédé et Ingénierie en Mécanique et Matériaux CNRS/ Arts et Métiers Paristech UPR 8006; Paris Cedex France
Florian Carro, Laboratoire PIMM Procédé et Ingénierie en Mécanique et Matériaux CNRS/ Arts et Métiers Paristech UPR 8006; Paris Cedex France
Presented at ICALEO 2010

New generation of laser drilling processes for cooling systems in aeronautics couples ablation and percussion removal regimes. Percussion using ms pulse laser duration, produces deep holes with high productivity and ablation, with ns laser pulse duration, regime machines shape holes with high quality. Up two now, acousto-optic Q-switch laser are mainly used for this micro-machining. However, energy/pulse duration/repetition rate are coupled not allowing a comprehensive approach of interaction mechanisms. In this paper, we explore laser drilling laser in ablation regime using an innovative laser from Trumf compagny. This laser provides TEM00 laser beam with energy and pulse duration independent of repetition rate. So, drilling velocity has been measured as function of laser parameters. It saturates at high laser intensity and stays constant for repetition rate under 70 KHz. Results are discussed vs laser screening induced by plasma in half-confined geometry and residual particles produced by the ablation.