Abstract
Spatial structures of ablative mass flow produced by femtosecond laser pulses are studied. In experiments with a gold film, the Ti:sapp laser pulse having a focal size of 100 microns on a target was used, while a soft X-ray probe pulse was utilized for diagnostics. The experimental data are compared with simulated mass flows obtained by two-temperature hydrodynamics and molecular dynamics methods. Simulation shows evolution of a thin surface layer pressurized after electron–ion thermalization, which leads to melting, cavitation and formation of spallation liquid layer. The calculated asymptotic surface velocity of this layer as a function of fluence is in reasonably good agreement with experimental data.
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Acknowledgments
The research (NAI, VVZh, VAKh, DKI, YVP, KPM, AYF, TAP) has been performed under financial support from Russian Science Foundation (RSCF) (Project No. 14-19-01599). This work (except NAI, VVZh, VAKh, DKI, YVP, KPM) was partly supported by Grant-in-Aid for Scientific Research (B), No. 25289244 (2013), from MEXT and bilateral program: Japan Society for the Promotion of Science (JSPA) and Russian Academy of Sciences (RAS) under the JSPS-RAS Joint Research Program (RFBR Grant 14-02-92107).
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Inogamov, N.A., Zhakhovsky, V.V., Hasegawa, N. et al. Hydrodynamics driven by ultrashort laser pulse: simulations and the optical pump—X-ray probe experiment. Appl. Phys. B 119, 413–419 (2015). https://doi.org/10.1007/s00340-015-6039-7
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DOI: https://doi.org/10.1007/s00340-015-6039-7