To provide a laser beam machining system capable of suppressing dividing ratio accuracy low not depending on the reflection rate of a reflection plate, a transmission rate of a half mirror, a solid difference of the laser beam machining system, etc., despite the simple constitution, and obtaining stable dividing ratio accuracy in terms of an age-base, in the laser beam machining system provided with a multiple splitting optical path.
A laser beam machining system 100, wherein, in machining a predetermined work 5 by splitting a laser beam 2 oscillated from one laser oscillator 1 into a plurality of optical paths into 4-1, 4-2, 4-3 using a splitting means 3, a return polarization canceling means 8 canceling a return polarization of a laser return beam 7 is provided in a space optical path 6 formed between the laser oscillator 1 and the laser beam splitting means 3.
NAKAJIMA TORU
ARIGA SATORU
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