Abstract
Pulsed laser drilling in steel was explored in a wide range of repetition rates (up to 200 kHz) at variable pressure of the ambient air. A critical repetition rate was established, exceeding of which drastically increased productivity of ablative drilling. The phenomenon was attributed to formation of a long-living domain (> 100 μs) with hot rarefied atmosphere in the vicinity of the ablated spot or inside the drilled channel. This rarefication was shown to reduce the plasma screening effect, which allows creation of quasi-vacuum conditions for laser ablative technology avoiding vacuum-pumped facilities.
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