Laser processing device and operation checking method

A laser processing device having at least a first mode in which an object is irradiated with laser light to perform laser processing and a second mode different from the first mode, the laser processing device comprising:

• a laser light source configured to output the laser light;
• a spatial light modulator configured to modulate the laser light output from the laser light source according to a phase pattern and emit the laser light;
• an objective lens configured to converge the laser light emitted from the spatial light modulator onto the object;
• a controller configured to control a phase pattern to be displayed on the spatial light modulator;
• and
• a determiner configured to determine whether operation of the spatial light modulator is normal when the second mode is being executed, wherein
• the controller performs switching control in which the phase pattern to be displayed on the spatial light modulator is switched when the second mode is being executed, and
• the determiner makes the determination on the basis of a change in intensity of the laser light emitted from the spatial light modulator between before the switching control and after the switching control.