We present ultrafast dynamics of solid-density plasma created by high-contrast (picosecond contrast ∼10−9), high-intensity (∼4 × 1018 W/cm2) laser pulses using time-resolved pump-probe Doppler spectrometry. Experiments show a rapid rise in blue-shift at early time delay (2–4.3 ps) followed by a rapid fall (4.3–8.3 ps) and then a slow rise in blue-shift at later time delays (>8.3 ps). Simulations show that the early-time observations, specifically the absence of any red-shifting of the reflected probe, can only be reproduced if the front surface is unperturbed by the laser pre-pulse at the moment that the high intensity pulse arrives. A flexible diagnostic which is capable of diagnosing the presence of low-levels of pre-plasma formation would be useful for potential applications in laser-produced proton and ion production, such as cancer therapy and security imaging.
Probing ultrafast dynamics of solid-density plasma generated by high-contrast intense laser pulses
Kamalesh Jana, David R. Blackman, Moniruzzaman Shaikh, Amit D. Lad, Deep Sarkar, Indranuj Dey, Alex P. L. Robinson, John Pasley, G. Ravindra Kumar; Probing ultrafast dynamics of solid-density plasma generated by high-contrast intense laser pulses. Phys. Plasmas 1 January 2018; 25 (1): 013102. https://doi.org/10.1063/1.5005176
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