Abstract: The threshold modes of metal cutting by combined radiation of CO$-2$/ laser with a ring TEM$-01$/ mode, 800 W power, 200 microns beam diameter and pulse-periodic Nd:YAG laser with a TEM$-00$/ mode, 90 microns beam diameter, 80 W average power are investigated. It was established, that improvement of CO$-2$/ laser radiation usage efficiency and narrowing of the cutting channel to Nd:YAG laser spot diameter is caused by tightening of radiation into the narrow channel. !11
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