ANALYSIS OF THERMAL PROCESSES OCCURRING IN THE MICRODOMAIN SUBJECTED TO THE ULTRASHORT LASER PULSE USING THE AXISYMMETRIC TWO-TEMPERATURE MODEL

2017 ◽  
Vol 15 (5) ◽  
pp. 395-411 ◽  
Author(s):  
Ewa Majchrzak ◽  
Jolanta Dziatkiewicz ◽  
Lukasz Turchan
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Thermal Processes ◽  
Temperature Model ◽  
Ultrashort Laser ◽  
Two Temperature

Acoustic probing of two-temperature relaxation initiated by action of ultrashort laser pulse

2010 ◽  
Vol 101 (1) ◽  
pp. 1-5 ◽  
Author(s):  
N. A. Inogamov ◽  
S. I. Ashitkov ◽  
V. V. Zhakhovsky ◽  
V. V. Shepelev ◽  
V. A. Khokhlov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Temperature Relaxation ◽  
Ultrashort Laser ◽  
Acoustic Probing ◽  
Two Temperature

scholarly journals Two-temperature hydrodynamic expansion and coupling of strong elastic shock with supersonic melting front produced by ultrashort laser pulse

2014 ◽  
Vol 500 (19) ◽  
pp. 192023 ◽  
Author(s):  
Nail A Inogamov ◽  
Vasily V Zhakhovsky ◽  
Viktor A Khokhlov ◽  
Brian J Demaske ◽  
Konstantin V Khishchenko ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Melting Front ◽  
Elastic Shock ◽  
Ultrashort Laser ◽  
Two Temperature

Two-temperature equation of state for aluminum and gold with electrons excited by an ultrashort laser pulse

2015 ◽  
Vol 119 (3) ◽  
pp. 401-411 ◽  
Author(s):  
Yu. V. Petrov ◽  
K. P. Migdal ◽  
N. A. Inogamov ◽  
V. V. Zhakhovsky
Keyword(s):  
Equation Of State ◽  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Ultrashort Laser ◽  
Two Temperature ◽  
Temperature Equation

scholarly journals Ultrashort Laser Pulse Heating of Nanoparticles: Comparison of Theoretical Approaches

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Renat R. Letfullin ◽  
Thomas F. George ◽  
Galen C. Duree ◽  
Brett M. Bollinger
Keyword(s):  
Laser Pulse ◽  
Laser Heating ◽  
Cell Damage ◽  
Heat Diffusion ◽  
Temperature Model ◽  
Particle Volume ◽  
Heat Diffusion Equation ◽  
Theoretical Approaches ◽  
Ultrashort Laser ◽  
Two Temperature

The interaction between nanoparticles and ultrashort laser pulses holds great interest in laser nanomedicine, introducing such possibilities as selective cell targeting to create highly localized cell damage. Two models are studied to describe the laser pulse interaction with nanoparticles in the femtosecond, picosecond, and nanosecond regimes. The first is a two-temperature model using two coupled diffusion equations: one describing the heat conduction of electrons, and the other that of the lattice. The second model is a one-temperature model utilizing a heat diffusion equation for the phonon subsystem and applying a uniform heating approximation throughout the particle volume. A comparison of the two modeling strategies shows that the two-temperature model gives a good approximation for the femtosecond mode, but fails to accurately describe the laser heating for longer pulses. On the contrary, the simpler one-temperature model provides an adequate description of the laser heating of nanoparticles in the femtosecond, picosecond, and nanosecond modes.

scholarly journals Investigation of heat transfer in metal nanofilms irradiated with ultrashort laser pulses: two-temperature model

2021 ◽  
Vol 2094 (2) ◽  
pp. 022023
Author(s):  
G V Mikheeva ◽  
A V Pashin
Keyword(s):  
Heat Transfer ◽  
Crystal Lattice ◽  
Ultrashort Laser Pulse ◽  
Numerical Study ◽  
Laser Pulses ◽  
Equilibrium Temperature ◽  
Ultrashort Laser Pulses ◽  
Temperature Model ◽  
Ultrashort Laser ◽  
Two Temperature

Abstract A numerical study of heat transfer between an electron gas and a crystal lattice in a metal nanofilm under irradiation with an ultrashort laser pulse was carried out on the basis of a parabolic two-temperature model of thermal conductivity presented in a dimensionless form. For the numerical solution, the finite difference method was used using the explicit-implicit Crank-Nicholson scheme. As a result of the numerical study, it was found that with an increase in the thickness of the plate, the equilibrium temperature decreases, and the time for the onset of thermal equilibrium between the electrons and the crystal lattice increases.

The effect of an ultrashort laser pulse on metals: Two-temperature relaxation, foaming of the melt, and freezing of the disintegrating nanofoam

2014 ◽  
Vol 81 (5) ◽  
pp. 233 ◽  
Author(s):  
N. A. Inogamov ◽  
Yu. V. Petrov ◽  
V. A. Khokhlov ◽  
S. I. Anisimov ◽  
V. V. Zhakhovskiĭ ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Temperature Relaxation ◽  
Ultrashort Laser ◽  
Two Temperature

scholarly journals Numerical Simulation of Thermal Processes in a Domain of Thin Metal Film Subjected to an Ultrashort Laser Pulse

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2116 ◽  
Author(s):  
Ewa Majchrzak ◽  
Bohdan Mochnacki
Keyword(s):  
Laser Pulse ◽  
Metal Film ◽  
Ultrashort Laser Pulse ◽  
Initial Conditions ◽  
Time Derivative ◽  
Thin Metal Film ◽  
Thin Metal ◽  
Thermal Processes ◽  
Phase Lag ◽  
Ultrashort Laser

A thin metal film subjected to an ultrashort laser pulse is considered. With a sufficiently high laser intensity the process of the film heating may cause metal melting and even ablation. In this work, the numerical model of the melting and resolidification processes is presented. The mathematical model is based on the dual phase lag equation in which two positive constants appear, this means the relaxation and thermalization times. The considered equation contains a second-order time derivative and higher order mixed derivative in both time and space and should be supplemented by the appropriate boundary and initial conditions. The model of the melting and resolidification is presented in two versions. The first can be called ‘the introduction of the artificial mushy zone sub-domain’, while the second ‘the two forms of the basic energy equation’. At the stage of numerical computations, the implicit scheme of the finite difference method is used. The numerical algorithm is tested for the two proposed models which are applied to the computations concerning the thermal processes occurring in the cylindrical micro-domain (chromium, gold) subjected to an ultrashort laser pulse.

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