High Power Laser Science and Engineering, Volume. 9, Issue 1, 010000e3(2021)
Reflecting laser-driven shocks in diamond in the megabar pressure range
Fig. 1. (a) Scheme of the target used in the experiment and (b) image of Ni layer deposited on target rear side (taken before deposition of the Ni layer on the target front side).
Fig. 2. Reflection of the VISAR probe beam: (a) from a reflecting shock traveling in the material; (b) from a free surface travelling in vacuum; (c) from a reflecting surface embedded in a compressed transparent material.
Fig. 3. VISAR streak camera images from shot 15: (a) VISAR with sensitivity
Fig. 4. Time history of the shock velocity in diamond obtained by analyzing the fringe shift of the two VISARs from shot 15 (
Fig. 5. (a) Density map of hydrodynamic simulations from MULTI 1D reproducing shot 15. (b) Pressure map of the same shot. (c), (d) Hydrodynamic simulations with the Ni step. Such plots allow the free surface velocity to be estimated for the Ni step and the diamond layer, respectively.
Fig. 6. Result of MULTI 2D simulation. Pressure map (in cgs units) at 14.3 ns within a 300 μm thick target irradiated by a 0.53 μm laser, flat top in space (spot diameter 500 μm) and time (duration 1 ns) with intensity 9 × 1013 W/cm2.
Fig. 7. Phase diagram of carbon according to Grumbach and Martin[7] and shock Hugoniot from the SESAME table 7834. The two dashed horizontal red lines show the range of pressures reached in diamond in our shot 15.
Fig. 8. Comparison of phase diagram of carbon from Benedict
Fig. 9. Energy gap versus temperature and electron density in the conduction band calculated using the formula from Varshni (constant density, effect of temperature only) and that from Bradley
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K. Jakubowska, D. Mancelli, R. Benocci, J. Trela, I. Errea, A. S. Martynenko, P. Neumayer, O. Rosmej, B. Borm, A. Molineri, C. Verona, D. Cannatà, A. Aliverdiev, H. E. Roman, D. Batani. Reflecting laser-driven shocks in diamond in the megabar pressure range[J]. High Power Laser Science and Engineering, 2021, 9(1): 010000e3
Category: Research Articles
Received: Jun. 27, 2020
Accepted: Oct. 9, 2020
Published Online: Feb. 8, 2021
The Author Email: D. Batani (dimitri.batani@u-bordeaux.fr)