Patent ID: 8644665

Claim:
A semiconductor manufacturing apparatus comprising: a laser light source for light-emitting laser light; a control unit for controlling laser power of the laser light source; an optical waveguide unit including a core section for transmitting the laser light and a clad section for covering the core section; and a lens for forming the laser light output from an output end surface of the optical waveguide unit into a laser spot having a predetermined shape, wherein the optical waveguide unit guides the laser light to the output end surface from an input end surface by a difference in refractive index between the core section and the clad section, irradiates an object with the laser spot formed by the lens, and thereby modifies the surface of the object, wherein the optical waveguide unit has, on the output end surface, the core section having a rectangular cross sectional shape whose one side has a length of 1 mm to 20 mm and other side orthogonal to the one side has a length of 1 mm to 60 mm, and wherein the control unit sets a value of the laser power of the laser light source so that a power density of the laser spot output from the output end surface of the core section is 0.1 mW/mm 2 or more.