Patent ID: 7088761

Claim:
A laser system characterized in that a solid state laser beam emitted from a solid state laser unit, and a laser diode beam emitted from a laser diode which oscillates in a wavelength range shorter than that of the solid state laser beam, are combined by a dichroic beam splitter; wherein, a diameter of the laser diode beam is condensed to less than a core diameter of an optical fiber capable of transmitting the solid state laser beam, the laser diode beam then being combined with the solid state laser beam, whereby the resultant combined beam is incident to the optical fiber capable of transmitting the solid state laser beam; and said resultant combined beam is guided in space by the optical fiber to a workpiece, which is irradiated with the laser diode beam and the solid state laser beam with absolute irradiation positions and irradiation shapes of the laser diode and solid state beams almost matching each other.