CC BY
13LM-O-5
Laser ablation in liquid, structures, and shock peening
V. Zhakhovsky1, Yu. Petrov23, V. Khokhlov2, V. Shepelev4, S. Fortova4, N. Inogamov12
1- Center for Fundamental and Applied Research, Dukhov Research Institute of Automatics, Moscow, Russia 2- Landau Institute for Theoretical Physics of the Russian Academy of Sciences (RAS), Chernogolovka, Russia 3- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia 4- Institute for Computer-Aided Design of the Russian Academy of Sciences, Moscow, Russia
nailinogamov@gmail.com
Lasers are used in many scientific and technological applications. We limit our report here to LSP (laser shock peening), LAL (laser ablation in liquid), and surface structuring. According to these applications this report is divided into three parts. (1) Formation of a shock wave under laser exposure. (2) Synthesis of colloidal solutions of nanoparticles by laser ablation in a liquid. (3) The appearance of surface structures. All three of these topics are closely related. The movement inside the target (topic 1) is inextricably linked with the movement outside the target (topic 2), i.e. internal motion is connected to a laser plume which is external motion. A laser plume ejected into a liquid is a source of nanoparticles. Movements inside and near the surface of the target ultimately leave an imprint on this surface (topic 3). This final imprint is the surface structures.
The radiation exposure scheme is as follows. There are two half-spaces contacting each other. One of them freely transmits laser radiation (vacuum, glass, water). The second half-space is filled with absorbent material. This half-space is the target. Laser radiation passes through a transparent medium and is absorbed in the target. The specific situation is determined by the type of transparent medium and the pulse duration. The energy of laser pulses for the described applications is fixed. Absorbed fluence is 0.1-10 J/cm2 for ultrashort pulses and 1-100 J/cm2 for nanosecond actions. We consider effects of non-one-dimensional geometry [1] in the propagation of shock waves in the interests of laser shock peening. One-dimensional evolution of ablation flow is well studied [1-4]. The report discusses how ablation proceeds in a liquid [1,59] (for applications connected to LAL) and describes the formation of various surface structures on films and bulk targets that accompanies these processes [10-14] (many applications with structuring).
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[5] Inogamov et al., Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability, AIP Conference Proceedings 1979, 190001 (2018).
[6] Inogamov et al., Dynamics of Gold Ablation into Water, J. Experim. Theor. Phys. (JETP) 127(1), 79-106 (2018).
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[13] Romashevskiy et al., Femtosecond Laser Irradiation of a Multilayer Metal-Metal Nanostructure, JETP Letters, Vol. 113, No. 5, pp. 308-316 (2021).
[14] Inogamov et al., Diffraction on a Microbubble and the Morphology of the Silicon Surface Irradiated through Glycerol by a Pair of Femtosecond Laser Pulses, JETP Letters, Vol. 113, No. 2, pp. 75-81 (2021).
