In a part extending along a line to cut in an object to be processed, laser light is oscillated in a pulsing fashion in an intermediate portion including an effective part, and is continuously oscillated in one end portion and {HEAD ~ the other end portion} on {TAIL ~ both sides} of the intermediate portion 
In a part extending along a line to cut in an object to be processed , laser light is oscillated in a pulsing fashion in an intermediate portion including an effective part , and is continuously oscillated in one end portion and { HEAD ~ the other end portion } on { TAIL ~ both sides } of the intermediate portion
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