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

Claim 2:
3. The method using femtosecond laser for nano precision preparation according to claim 1, wherein the laser emitted by the femtosecond laser in the step (2) has a center wavelength of 800 nm, a pulse width of 150 fs, and a repetition frequency of 1 kHz; the diameter of a light spot is enlarged by 2-4 times after a laser beam is expanded by a concave lens L1 and a first convex lens L2; the objective lens used for laser processing is a flat-field achromatic objective lens with a numerical aperture of 0.8 and a magnification of 80 times.