Wave-permeable materials with certain metallic film patterns are of importance for electromagnetic wave transportation. Laser processing showed obvious advantages when fabricating such materials. The article studied the etching effects of key laser parameters on Al-coated composite materials. It is found that (1) a balance of etching quality and efficiency could be obtained when the operating laser energy density is about five to eight times that of the ablation threshold; (2) the effects of the laser focal spot size and the pulse overlap are interrelated to decide machining precision; and (3) the laser scanning trajectory affects the appearance of the etched surface, possibly due to the fiber bundle braided direction. The findings could benefit similar wave-permeable materials laser processing.

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