Patent ID: 7674395

Claim:
A method for manufacturing a work article by a femtosecond laser, comprising: an etching step of laser etching the work article made of an inorganic material by irradiating the work article with successive trains of light pulses from a femtosecond laser light; and a scattering step of scattering during an etching pause time, from an etching position of the work article, a plasma cloud of an atomic or molecular particle released from the work article by optical ablation caused by the femtosecond laser light at the etching step, wherein the etching pause time is provided between two trains of light pulses for a predetermined duration that is longer than a period of irradiating the work article with the train of light pulses such that the plasma cloud is scattered from the etching position during the etching pause time and the work article is irradiated with the train of light pulses after the plasma cloud is scattered from the etching position.