METHOD FOR DETERMINING THE OPERATIONAL CONDITIONS OF A METHOD FOR HIGH-REPETITION RATE FEMTOSECOND LASER ABLATION FOR A GIVEN MATERIAL AND METHOD FOR LASER WELDING BETWEEN PARTS OF A DETERMINED MATERIAL

摘要

The invention proposes a method for determining the operational conditions of a method for high-repetition rate femtosecond laser ablation for a given material comprising a first step of determining a set of parameters of a burst of laser pulses adapted to generate an ablation crater in the material, the set of parameters comprising an intra-burst repetition frequency f between several hundred MHz and 100 GHz, a number N of pulses of the burst of laser pulses equal to a number Ne of heating and ablation pulses, with Ne being defined by the equation Nc = (L2.f)/D, where L represents a test depth and D represents a thermal diffusion coefficient of the material to be ablated, with Nc being greater than or equal to 10, a characteristic total fluence FTchar of the burst of pulses and a characteristic fluence per pulse Fchar=FTchar/Nc per pulse below an ablation threshold fluence Fsl of the material by a single laser pulse.