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ON THE MODELING OF DOUBLE PULSE LASER ABLATION OF METALS

ON THE MODELING OF DOUBLE PULSE LASER ABLATION OF METALS. M. Povarnitsyn , K. Khishchenko, P. Levashov Joint Institute for High Temperatures, RAS , Moscow , Russia povar@ihed.ras.ru T. Itina Laboratoire Hubert Curien, CNRS, St-Etienne, France.

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ON THE MODELING OF DOUBLE PULSE LASER ABLATION OF METALS

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  1. ON THE MODELING OF DOUBLE PULSE LASER ABLATION OF METALS M. Povarnitsyn, K. Khishchenko, P. Levashov Joint Institute for High Temperatures, RAS, Moscow, Russia povar@ihed.ras.ru T. Itina Laboratoire Hubert Curien, CNRS, St-Etienne, France XIII International Conference on Physics of Non-Ideal Plasmas Chernogolovka, Russia September 16, 2009

  2. Outline • Motivation • Set-up configuration • Double pulse experiments • Numerical model • — Basic equations • — Transport properties • — Equation of state • — Fragmentation effects • Preliminary results • Summary

  3. Ti:Sapphire Double pulse set-up 2 x 2 J/cm2 =0.8 mkm FWHM = 100 fs

  4. double pulse single pulse Experiment: single & double pulses, Cu A.Semerok & C. Dutouquet Thin Solid Films453 – 454 (2004)

  5. Experiment: single & double pulses J. Hermann & S. Noël, LP3 (2008) T. Donnelly et al. J. Appl. Phys. 106, 013304 2009

  6. Two-temperature multi-materialEulerian hydrodynamics Basic equations Mixture model

  7. Transport properties on melting Handbook of optical constants of solids, E. Palik et al. K. Eidmann et al. Phys. Rev. E 62, 1202 (2000)

  8. bn unstable sp Two-temperature semi-empirical EOS

  9. Mechanicalspallation (cavitation) P P P unstable liquid + voids Time to fracture is governed by the confluence of voids

  10. Spallation criteria Strain rate in laser experiments is up to 1010 s-1 Energy minimization D. Grady, J. Mech. Phys. Solids 36, 353 (1988).

  11. Basic features of the model • Multi-material hydrodynamics (several substances + phase transitions) • Two-temperature model (Te  Ti) • Two-temperature equations of state • Wide-range models of el-ion collisions, permittivity, heat conductivity (, , ) • Model of laser energy absorption (Helmholtz) • Model of ionization & recombination (metals)

  12. Simulation: single pulse 12

  13. density phase states Simulation: x-t diagram of Cu, F=1.2 J/cm2 laser pulse new surface initial surface

  14. Ablation depth vs. fluence Experiment: M. Hashida et al. SPIE Proc. 4423, 178 (2001). J. Hermann et al. Laser Physics 18(4), 374 (2008). M.E. Povarnitsyn et al., Proc. SPIE 7005, 700508 (2008)

  15. Simulation: double pulse with delay=50ps 15

  16. Simulation: delay 50 ps, density of Cu 2nd pulse 1st pulse 2dpulse 1stpulse

  17. Simulation: delay 50 ps, phase states of Cu 2nd pulse (g) (l) g 1st pulse l 2dpulse s l+g 1stpulse

  18. Simulation: single & double pulse 22 J/cm2 18

  19. Summary • Model describes ablation depth for single and double pulse experiments in the range 0.1 – 10 J/cm2. • For long delays the second pulse interacts with the nascent ablation plume (in liquid phase). • Reheating of the nascent ablation plume results in suppression of the rarefaction wave. • Back deposition of substance caused buy the secondpulse is the reason of even less crater depth for double pulses with long delay.

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