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274 results on '"Anisimov, S. I."'

5. Spallative ablation of dielectrics by X-ray laser

Author

Inogamov, N. A., Zhakhovsky, V. V., Faenov, A. Ya., Khokhlov, V. A., Shepelev, V. V., Skobelev, I. Yu., Kato, Y., Tanaka, M., Pikuz, T. A., Kishimoto, M., Ishino, M., Nishikino, M., Fukuda, Y., Bulanov, S. V., Kawachi, T., Petrov, Yu. V., Anisimov, S. I., and Fortov, V. E.

Subjects
Physics - Optics, Condensed Matter - Materials Science, Physics - Plasma Physics
Abstract

Short laser pulse in wide range of wavelengths, from infrared to X-ray, disturbs electron-ion equilibrium and rises pressure in a heated layer. The case where pulse duration $\tau_L$ is shorter than acoustic relaxation time $t_s$ is considered in the paper. It is shown that this short pulse may cause thermomechanical phenomena such as spallative ablation regardless to wavelength. While the physics of electron-ion relaxation on wavelength and various electron spectra of substances: there are spectra with an energy gap in semiconductors and dielectrics opposed to gapless continuous spectra in metals. The paper describes entire sequence of thermomechanical processes from expansion, nucleation, foaming, and nanostructuring to spallation with particular attention to spallation by X-ray pulse.

Published
2009
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6. Two-temperature relaxation and melting after absorption of femtosecond laser pulse

Author

Inogamov, N. A., Zhakhovskii, V. V., Ashitkov, S. I., Khokhlov, V. A., Petrov, Yu. V., Komarov, P. S., Agranat, M. B., Anisimov, S. I., and Nishihara, K.

Subjects
Physics - Optics, Physics - Computational Physics
Abstract

The theory and experiments concerned with the electron-ion thermal relaxation and melting of overheated crystal lattice constitute the subject of this paper. The physical model includes two-temperature equation of state, many-body interatomic potential, the electron-ion energy exchange, electron thermal conductivity, and optical properties of solid, liquid, and two phase solid-liquid mixture. Two-temperature hydrodynamics and molecular dynamics codes are used. An experimental setup with pump-probe technique is used to follow evolution of an irradiated target with a short time step 100 fs between the probe femtosecond laser pulses. Accuracy of measurements of reflection coefficient and phase of reflected probe light are ~1% and $\sim 1\un{nm}$, respectively. It is found that, {\it firstly}, the electron-electron collisions make a minor contribution to a light absorbtion in solid Al at moderate intensities; {\it secondly}, the phase shift of a reflected probe results from heating of ion subsystem and kinetics of melting of Al crystal during $0

Published
2008
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9. Numerical Simulation of the Expansion into Vacuum of a Crystal Heated by an Ultrashort Laser Pulse

Author

Anisimov, S. I., Inogamov, N. A., Petrov, Yu. V., Zhakhovskii, V. V., Nishihara, K., Rhodes, William T., editor, Adibi, Ali, editor, Asakura, Toshimitsu, editor, Hänsch, Theodor W., editor, Kamiya, Takeshi, editor, Krausz, Ferenc, editor, Monemar, Bo, editor, Venghaus, Herbert, editor, Weber, Horst, editor, Weinfurter, Harald, editor, and Phipps, Claude, editor

Published
2007
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23. Spallative ablation of dielectrics by X-ray laser

Author

Inogamov, N. A., Zhakhovsky, V. V., Faenov, A. Y., Khokhlov, V. A., Shepelev, V. V., Skobelev, I. Y., Kato, Y., Tanaka, M., Pikuz, T. A., Kishimoto, M., Ishino, M., Nishikino, M., Fukuda, Y., Bulanov, S. V., Kawachi, T., Petrov, Y. V., Anisimov, S. I., and Fortov, V. E.

Published
2010
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