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

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...

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Bibliographic Details
Published in:Physical review letters 2010-09, Vol.105 (10), p.105002-105002, Article 105002
Main Authors: Mondal, S, Lad, Amit D, Ahmed, Saima, Narayanan, V, Pasley, J, Rajeev, P P, Robinson, A P L, Kumar, G Ravindra
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATION
BENCHMARKS
COMPUTERIZED SIMULATION
DOPPLER BROADENING
EMISSION SPECTROSCOPY
FLUID MECHANICS
HOT PLASMA
HYDRODYNAMICS
LASERS
LINE BROADENING
MAPPING
MECHANICS
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA SIMULATION
RESOLUTION
SIMULATION
SPECTROSCOPY
SURFACES
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.105002