“…Experimental studies of the gas-dynamic processes taking place in the case of laser erosion of metals by nanosecond pulses in the presence of rarefi ed gases [24,49] and at atmospheric pressure [25,26,45,46,48,52] showed a qualitative difference between the processes of initiation of a vapor-plasma formation in air and its interaction with the incident radiation as compared to the case of initiation of a vapor-plasma formation in vacuum [53][54][55][56]. In [45,46,48], it was shown Fig.…”