Abstract: Glass fiber reinforced polymer is widely used in the manufacture of container or outer skin of radar equipment because of its excellent wave permeability and dielectric properties. In order to etch the surface of glass fiber reinforced polymer precisely, it was etched by femtosecond pulse laser with wavelength of 1 030 nm, and the ablation effect of different laser energy density, scanning speed and etching times were considered. It was found that the ablation state of femtosecond laser can be divided into weak ablation and strong ablation, and the strong ablation state can be formed on the basis of weak ablation. In the weak ablation state, the removal mechanism of laser on the material is mainly vaporization with less thermal effect, and parts of the original structure and chemical properties can be maintained on the processed surface. When the laser energy density, spot overlap rate or scanning times increased, the heat accumulation effect on the surface was enhanced, the ablation rate of the material was intensified, and the ablation state was changed. After ablation, the microstructure and chemical properties of the material surface changed, and the carbonization phenomenon was significant.

Key words: femtosecond laser, GFRP, material ablation