Patent ID: 8873595
Filing Date: 2014-10-28
Classification: B23K,H01L,H01S,Y02E

Abstract:
1. A laser processing method of processing a metal thin film formed on a transparent substrate by a pulsed light radiation, comprising the steps of: preparing a semiconductor laser that repeatedly outputs pulsed light by being directly modulated in accordance with electric signals; preparing a MOPA fiber laser comprising, at least, an optical amplifier that includes a glass doped with a rare earth element and amplifies the pulsed light outputted from the semiconductor laser; controlling a full width at half maximum of the pulsed light outputted from the optical amplifier to be 0.2 ns or longer but shorter than 1 ns; and removing the metal thin film by radiating the pulsed light, emitted from the MOPA fiber laser, onto the metal thin film from the opposite side of the metal thin film with respect to the transparent substrate, wherein the metal thin film is composed of a high-melting-point metal such as Mo.