LASER DEVICE

摘要

The present invention is a laser device which outputs necessary laser light and does not output unnecessary laser light, said laser device characterized in being provided with: a laser light generation unit (3) which generates laser light; a power generation unit (4) which generates power by being irradiated with the laser light; and optical means (8) which causes the optical path for the unnecessary laser light and the optical path for the necessary laser light to be different light paths among the laser light emitted from the laser light generation unit (3). The laser device is also characterized in that the unnecessary laser light is irradiated to the power generation unit (4). The laser device is further characterized in being additionally provided with diameter expansion means upon an optical path between the optical means and the power generation unit.