Research and application of surface heat treatment for multipulse laser ablation of materials

Sequences of Sub-Microsecond Laser Pulses for Material Processing: Modeling of Coupled Gas Dynamics and Heat Transfer

“…Thus, the efficiency of laser treatment decreases with the pulse energy. High repetition-rate sequences of pulses is a well-known solution to increase the efficiency [1][2][3][4].…”

“…Cai et al [4] modeled laser processing by the sequences of sub-millisecond pulses. Their model provided a theoretical guidance for optimizing the process parameters of laser ablation.…”

“…Cai et al [4] studied surface heat treatment by laser pulses of 1064 nm wavelength, 210 ns duration and the inter-pulse separation of the order of 10 µs. A rigorous model of conductive heat transfer in the target was proposed [4].…”

“…Cai et al [4] studied surface heat treatment by laser pulses of 1064 nm wavelength, 210 ns duration and the inter-pulse separation of the order of 10 µs. A rigorous model of conductive heat transfer in the target was proposed [4]. The dynamics of vapor and ambient gas was not considered in detail while simple models for evaporation and vapor ionization were used to take into account the shielding of the target by laser plasma.…”

“…However, the DSMC computation becomes extremely time consuming at small Knudsen numbers. This is why it is not applied in the recent models for sub-microsecond [4] and millisecond [3] laser pulses.…”