Patent ID: 8546722

Claim:
A laser processing apparatus scanning and processing an object to be processed with processing light, the laser processing apparatus comprising: a first light emitting unit emitting processing light; a first light guide conducting the processing light emitted from the first light emitting unit to an object to be processed; a second light emitting unit emitting observation light that observes the object to be processed; a plurality of second light guides conducting the observation light emitted from the second light emitting unit to the object to be processed; a third light guide conducting light having a plurality of wavelengths generated at the object to be processed; a detecting unit detecting the light having a plurality of wavelengths conducted by the third light guide; and a control unit controlling a light emitting state of the first light emitting unit, based on a result of detection by the detecting unit, wherein the second light guides are categorized into at least two groups, and the observation light is conducted by each group in sequence, the observation light being emitted from the second light emitting unit.