Patent ID: 8727610

Claim:
A laser processing apparatus for processing a member to be processed by irradiating the member with laser light, the apparatus comprising: a laser for generating laser light; optical means for converging the laser light generated by the laser onto a processing area; and a filter, disposed between the member to be processed and the optical means for converging the laser light at a position closer to the member to be processed, for blocking a wavelength of fluorescence including a wavelength of 1100 nm to 2800 nm generated by the optical means upon pumping with the laser light; and a temperature detecting means for measuring a temperature of the processing area according to a light component including the wavelength of 1100 nm to 2800 nm blocked by the filter in light thermally radiating from the processing area, wherein a first light path of laser light heading from the laser to the processing area and a second light path of light thermally radiating from the processing area and heading towards the temperature detecting means are different from each other, wherein the filter is disposed on the first light path, wherein the temperature detecting means is disposed on the second light path, wherein light having the wavelength blocked by the filter is used for measuring a temperature of the processing area, wherein the laser heats and melts the processing area by irradiation of the laser light, and wherein the thermal radiation occurs in the processing area through the processing area being heated and melted by laser light irradiation.