Details

Autor(en) / Beteiligte

• Mondal, S
• Lad, Amit D
• Ahmed, Saima
• Narayanan, V
• Pasley, J
• Rajeev, P P
• Robinson, A P L
• Kumar, G Ravindra

Titel

Doppler spectrometry for ultrafast temporal mapping of density dynamics in laser-induced plasmas

Ist Teil von

• Physical review letters, 2010-09, Vol.105 (10), p.105002-105002, Article 105002

Ort / Verlag

United States

Erscheinungsjahr

2010

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We present high resolution measurements of the ultrafast temporal dynamics of the critical surface in moderately overdense, hot plasma by using two-color, pump-probe Doppler spectrometry. Our measurements clearly capture the initial inward motion of the plasma inside the critical surface of the pump laser which is followed by outward expansion. The measured instantaneous velocity and acceleration profiles are very well reproduced by a hybrid simulation that uses a 1D electromagnetic particle-in-cell simulation for the initial evolution and a hydrodynamics simulation for the later times. The combination of high temporal resolution and dynamic range in our measurements clearly provides quantitative unraveling of the dynamics in this important region, enabling this as a powerful technique to obtain ultrafast snapshots of plasma density and temperature profiles for providing benchmarks for simulations.