Specificity of Boundary Conditions
for Laser-Stimulated Destructive Surface
Treatment Without Melting
L. V. Shmeleva, A. D. Suprun, S. M. Yezhov, and V. V. Datsyuk
1 Introduction
The femtosecond laser technique is an important instrument of fundamental
researches of nonequilibrium processes in the condensed environments, actively
used in modern laser technologies for high-precision materials processing, as well
as for the creation of new functional nanomaterials. Unlike the typical evaporation
process for influence on metals and semiconductors of laser pulses of microsecond
and nanosecond duration, in the case of femtosecond pulses, the main mechanism is
thermomechanical ablation, which leads to the removal of the surface nanolayer as a
result of the appearance of a powerful substance tensile stresses [1]. For laser pulses,
the duration of which is less than the relaxation time of thermally elastic loads or
the speed of sound in the substance being heated, and the density energy above the
ablation threshold, stress concentration can lead to a pressure higher than gigapascal
level [2]. Such a powerful action on the surface of the irradiated substances leads
to damages in the form of microcraters that is demonstrated in Fig. 1. The study of
nanostructures arising on the surface of a solid under the influence of destructive
radiation is given considerable attention [4–10].
According to experimental estimations characteristic level of energy, from which
active destruction of surface begins practically without formation of liquid phase
exceeds 0.5–20 PW/cm
2 [2] depending on the material. If the flow is substantially
higher than this value, a considerable part of energy of laser radiation is outlaid on a
direct phase solid–gas transition. A liquid phase in the area of treatment is practically
absent in this case. Such streams represent the main interest of this research.
L. V. Shmeleva (B) · A. D. Suprun · S. M. Yezhov · V. V. Datsyuk
Kiev 01601, Ukraine
e-mail: lshmel@univ.kiev.ua
© Springer Nature Switzerland AG 2021
O. Fesenko and L. Yatsenko (eds.), Nanomaterials and Nanocomposites,
Nanostructure Surfaces, and Their Applications, Springer Proceedings
in Physics 246, https://doi.org/10.1007/978-3-030-51905-6_23
289
for Laser-Stimulated Destructive Surface
Treatment Without Melting
L. V. Shmeleva, A. D. Suprun, S. M. Yezhov, and V. V. Datsyuk
1 Introduction
The femtosecond laser technique is an important instrument of fundamental
researches of nonequilibrium processes in the condensed environments, actively
used in modern laser technologies for high-precision materials processing, as well
as for the creation of new functional nanomaterials. Unlike the typical evaporation
process for influence on metals and semiconductors of laser pulses of microsecond
and nanosecond duration, in the case of femtosecond pulses, the main mechanism is
thermomechanical ablation, which leads to the removal of the surface nanolayer as a
result of the appearance of a powerful substance tensile stresses [1]. For laser pulses,
the duration of which is less than the relaxation time of thermally elastic loads or
the speed of sound in the substance being heated, and the density energy above the
ablation threshold, stress concentration can lead to a pressure higher than gigapascal
level [2]. Such a powerful action on the surface of the irradiated substances leads
to damages in the form of microcraters that is demonstrated in Fig. 1. The study of
nanostructures arising on the surface of a solid under the influence of destructive
radiation is given considerable attention [4–10].
According to experimental estimations characteristic level of energy, from which
active destruction of surface begins practically without formation of liquid phase
exceeds 0.5–20 PW/cm
2 [2] depending on the material. If the flow is substantially
higher than this value, a considerable part of energy of laser radiation is outlaid on a
direct phase solid–gas transition. A liquid phase in the area of treatment is practically
absent in this case. Such streams represent the main interest of this research.
L. V. Shmeleva (B) · A. D. Suprun · S. M. Yezhov · V. V. Datsyuk
Kiev 01601, Ukraine
e-mail: lshmel@univ.kiev.ua
© Springer Nature Switzerland AG 2021
O. Fesenko and L. Yatsenko (eds.), Nanomaterials and Nanocomposites,
Nanostructure Surfaces, and Their Applications, Springer Proceedings
in Physics 246, https://doi.org/10.1007/978-3-030-51905-6_23
289