Laser drilling is commonly used by industrials to drill hole in a wide super-alloys. These materials have high thermal and mechanical properties that make them difficult to machine. Moreover they are coated by a ceramic which have high hardness, chemical inertness and low thermal conduction. This paper deals with the study of percussion laser drilling on target with thermal barrier coating. Results reveal the aero and hydrodynamic behaviors of the vapor and the melt flow through the front hole during the drilling on stainless steel, Aluminum alloys, carbon composite and thermal barrier coating.

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