Patent ID: 9452495
Filing Date: 2016-09-27
CPC Classification: B23K

Claim Text:
1. A tool to slice ingots of crystals comprising: (a) a reservoir to supply an alkali solution on a cutting front of an ingot, wherein the ingot is gallium nitride or its solid solution with aluminum nitride or indium nitride; (b) a laser configured to shine a laser beam on the cutting front; wherein the laser beam has a photon energy higher than a band gap of the ingot and a sufficiently small divergence angle to cut through the ingot by illuminating the cutting front as the cutting front progresses through the ingot; and (c) a beam splitter to generate multiple beams of laser light configured to produce multiple cutting fronts in the ingot simultaneously, wherein a spacing of the beams determines the thickness of a wafer cut from the ingot.