1. M. Povarnitsyn, K. Khishchenko, P. Levashov
A wide-range model for simulation of pump-probe experiments with metals
M. Povarnitsyn, K. Khishchenko, P. Levashov
Joint Institute for High Temperatures RAS, Moscow, Russia
T. Itina
Laboratoire Hubert Curien, CNRS, St-Etienne, France
EMRS-2011
Laser materials processing for micro and nano applications
Nice, France 12 May, 2011

2. Outline Motivation Model — Governing equations — Equation-of-state
— Transport properties
Pump-probe technique
Simulation results
Conclusions

3. Motivation
Reflectivity R
Phase shift ψ

4. Two-temperature hydrodynamic model

5. Two-temperature semi-empirical EOSbn
unstable sp

6. Frequency of collisions
Eidmann et al. PRE 62 (2000)
Pump-probe for cold
Elsayed et al. PRL 58, 1212 (1987)
Groeneveld et al. PRL 64, 784 (1990)
Schoenlein et al. PRL 58, 1680 (1987)

7. Electron-ion coupling model

8. Electron-ion coupling

9. Thermal conductivity model

10. Thermal conductivity of Al, Ti = Te

11. Permittivity model

12. Permittivity of Al, Ti = Troom
E. D. Palik, Handbook of optical constants of solids, 1985.

13. Equations of EM field

14. Transfer-matrix method (optics)
Born, M.; Wolf, E., Oxford, Pergamon Press, 1964.

15. Energy absorption

16. Widmann et al. PHYSICS OF PLASMAS 8 (2001)
Pump-probe technique
pump
probe
CCD
delay
target
Widmann et al. PHYSICS OF PLASMAS 8 (2001)

17. Reflectivity of S- and P-polarized probes

18. Phase shift of S- and P-polarized probes

19. Conclusions
Pump-probe experiments provide an integral test of the models in the theoretically difficult regime of warm dense matter
The target material motion is evident for heating by femtosecond pulses of intensity > 1014 W/cm2.
Phase shift of S and P-polarized pulses is different because of separated zones of absorption
Uncertainty in the pulse energy determination of ~ 10% gives substantial deflection of the theoretical curves

20. Appendix

21. Appendix