Doppler Spectrometry for Ultrafast Temporal Mapping of Density Dynamics in Laser-Induced Plasmas

被引:39
作者
Mondal, S. [1 ]
Lad, Amit D. [1 ]
Ahmed, Saima [1 ]
Narayanan, V. [1 ]
Pasley, J. [2 ,3 ]
Rajeev, P. P. [3 ]
Robinson, A. P. L. [3 ]
Kumar, G. Ravindra [1 ]
机构
[1] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[2] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England
[3] Rutherford Appleton Lab, Cent Laser Facil, Chilton, Oxon, England
关键词
ACCELERATION; SHIFT;
D O I
10.1103/PhysRevLett.105.105002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
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页数:4
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