Patent ID: 7807940

Claim:
A laser processing apparatus for processing an object to be processed by concentrating a laser light to the object to be processed, the laser processing apparatus comprising: a stage configured to hold the object to be processed; a first optical system having a laser light concentrating position adjustment device for adjusting a concentrating position of a laser light for processing; a second optical system configured to guide a laser light for observation to the object to be processed, the second optical system having an automatic focusing mechanism for adjusting a focal position of the second optical system; and an objective lens shared by the first optical system and the second optical system and configured to face a surface of the object to be processed, wherein, while the object to be processed is processed, the automatic focusing mechanism drives the objective lens to maintain a distance between the objective lens and the surface of the object to be processed so that a focal position of the laser light for observation is adjusted on the surface of the object to be processed, and the concentrating position of the laser light for processing is adjusted by the laser light concentrating position adjustment device.