Patent ID: 7566639

Claim:
A manufacturing method for a nitride semiconductor device, comprising the steps of: (a) forming a semiconductor lamination portion formed of nitride semiconductor layers which include at least an n-type layer and a p-type layer on a surface of a wafer made of a GaN based substrate, (b) forming processed traces in at least a portion of intended cutting lines, along which the wafer is divided into chips, and in a certain depth within the GaN based substrate and with intervals of approximately 1.5 μm to 3.0 μm between adjacent processed traces, by irradiating a laser beam having a wavelength that is longer than a wavelength corresponding to a band gap energy of the GaN based substrate and an electrical field intensity, by which multiple photons absorption is caused, and (c) dividing the wafer along cutting starting points which are formed in the vicinity of the processed traces.