LASER IRRADIATION APPARATUS AND LASER MACHINING METHOD

摘要

A laser irradiation apparatus (1) which is provided with: an environment isolation container (2), which houses a laser oscillator (21) and is disposes in water; a laser irradiation head (4), which collects laser beams and irradiates a part to be machined with the laser beams; a light guide section (5) which transmits the laser beams from the laser oscillator (21) to the laser irradiation head (4) ; a power supply apparatus (8) which supplies the laser oscillator (21) with power; a cooling water supplying apparatus (8), which supplies the laser oscillator (21) with cooling water through a cooling water supplying path; and a temperature sensor (T1) which measures the temperature inside of the environment isolation container (2) . The temperature and/or the flow quantity of the cooling water to be supplied from the cooling water supplying apparatus (8) is controlled on the basis of the measurement results obtained from the temperature sensor (T1).