PURPOSE: To surely judge a cutting condition by parallel observing the radiation light of another wavelength from the wavelength of the radiation light from a cutting part.
CONSTITUTION: An optical fiber 3 for transmitting a YAG laser and plural pieces of small-diameter optical fibers 4 for monitoring for transmitting the radiation light are connected to a laser cutting tool 2. A material 1 to be cut is irradiated with the YAG laser directionally changed by a reflection mirror 7 via an exit hole 8 on the side face of a tool body 5. The complete cut off of the material 1 to be cut is judged if the radiation light of the same wavelength λ1, of the exit light 9 and the specific wavelength λ2. radiated when the material to be cut melts are monitored.
HASHIMOTO YOSHIO
NAGASHIMA TADASHI
| JPS4823092A | ||||
| JPS56119689A | 1981-09-19 |