Patent ID: 9406515
Filing Date: 2016-08-02
CPC Classification: B23K,G02B,H01L

Claim Text:
1. A method of performing laser annealing on a wafer, comprising: irradiating a tunable mask with pump lasers emitted from pump laser sources, the pump laser sources forming a pump laser source array; irradiating the tunable mask with an annealing laser emitted from an annealing laser source, wherein the tunable mask becomes transmissive to at least part of the annealing laser after being irradiated by the pump lasers, wherein the tunable mask has a band gap Eg, the annealing laser has an optical band gap Eb larger than the band gap Eg, and the pump lasers has an optical band gap Ea larger than the optical band gap Eb, and wherein the tunable mask is substantially opaque to the annealing laser when it is not irradiated by the pump lasers.