Patent ID: 11914165
Assignee: JILIN UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC G  B  H | IPC B  G  H

Claim 3:
4. The method using femtosecond laser for nano precision preparation according to claim 1, wherein the material damage threshold Fth in the step (2) is measured according to the following manner: adjusting the single pulse energy of incident laser to be E1, E2, . . . , Ek, . . . , and En for performing the single pulse ablation on the surface of the material, and measuring the diameters D1, D2, . . . , Dk, . . . , Dn of corresponding ablation pits under an electron microscope; and fitting the relationship between the diameters of the ablation pits and the single pulse energy through the formula Dk2=2w02[In(Ek)−In(Fth)], thereby determining that an undetermined coefficient is focused on Gaussian light spot beam waist w0 and the material damage threshold Fth.