Laser processing is expected to be an alternative technology to blasting because it can perform high-reproducibility processing without contact. The phenomenon of laser ablation is determined by the interaction of three factors: laser conditions, target material properties, and atmosphere. To achieve high-efficiency processing with lasers, it is necessary to examine in detail the effects of various conditions related to laser irradiation. This study aimed to extract factors governing evaporation by using an infrared nanosecond pulsed fiber-laser to perform laser ablation on Ag-50mass%Pd in Ar gas atmosphere and examining the effects of laser conditions on evaporation rate and ablation efficiency. The investigation of various laser irradiation conditions revealed that there exists an optimal pulse width at which the evaporation rate reaches a maximum value for the same pulse energy. The results of this study made it possible to organize the ablation efficiency in laser irradiation describing an elliptical orbit on the target by a new parameter called inter-pulse distance d.

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