Patent ID: 8951889
Filing Date: 2015-02-10
Classification: B23K

Abstract:
1. A laser processing method of a sapphire substrate in a light emitting diode (LED) element comprising: preparing a sapphire substrate on which plural stacked portions spaced from each other are formed; irradiating a short pulse laser beam from a laser light source; making the laser beam irradiated from the laser light source pass through a beam shaping module; adjusting a position of a light concentrating unit or the sapphire substrate such that the laser beam is concentrated to the inside of the sapphire substrate of the LED element through the light concentrating unit and a phase transformation area is formed within the sapphire substrate; and detecting photoluminescence light emitted by the stacked portions due to the laser beam, wherein the photoluminescence light is incident to a detection unit through a dichroic mirror provided between the laser light source and the light concentrating unit, and when the detection unit detects the photoluminescence light, the laser beam is controlled so as to be introduced into the sapphire substrate while avoiding an area where the stacked portions are formed on the sapphire substrate.