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We demonstrate pump-probe techniques, namely the Doppler spectrometry and thereflectometry in detail, which directly capture the time-resolved ultrafastevolution of high intensity femtosecond laser-driven hot, dense plasma. Thesetechniques are capable of capturing ultrafast plasma dynamics on time scales ofsub 100 femtosecond. We have shown the dynamics of high intensity femtosecondlaser-driven shock like disturbance into the plasma at densities more than10^22/cc. This can help understanding the physics related to shock ignition,supernova explosion and many other astrophysical scenarios and also can haveimplications in medicine and chemistry. Furthermore, we have investigated theultrafast acoustic phenomena due to hydrodynamics inside an expanding hot,dense plasma in its transient phase by the correlated measurements of Dopplerspectrometry and reflectometry.

Observation of ultrafast laser-plasma evolution by pump-probe reflectometry and Doppler spectrometry