研究目的
Investigating the possibility of recovering a plasma’s full complex index of refraction in a single shot pump-probe experiment and its relation to the plasma’s particle distribution function.
研究成果
The paper demonstrates the possibility of recovering a plasma’s complex index of refraction with a single shot high-bandwidth pump-probe experiment. The wavelength-dependent refractive index is directly related to the particle distribution function and can be used to recover plasma parameters including electron and ion temperatures, electron density, and plasma ?ow velocity.
研究不足
The bandwidth of the probe laser must have a narrow spectral spacing and be broad enough to resolve the features of interest, primarily the ion acoustic resonances. The laser must be on for at least one modulation cycle to resolve the spectrum, which reduces the temporal resolution.
1：Experimental Design and Method Selection:
The design utilizes concepts similar to smoothing by spectral dispersion but avoids the effects of angular dispersion by applying bandwidth to the probe. Theoretical modeling and fluid simulations are used.
2：Sample Selection and Data Sources:
The interaction of two crossing laser beams in a plasma is studied, with applications to implosion symmetry in Inertial Con?nement Fusion (ICF) experiments.
3：List of Experimental Equipment and Materials:
Electro-Optical Modulator (EOM), echelon, Random Phase Plate (RPP) or Continuous Phase Plate (CPP), and focusing optics.
4：Experimental Procedures and Operational Workflow:
The probe beam is given a bandwidth using an EOM and echelon, polarized at an angle to the pump, and crossed to examine the plasma of interest.
5：Data Analysis Methods:
The ratio between the spectra of the parallelly polarized probe and the reference spectra of the perpendicularly polarized probe is used to determine the experimental gain and refractive index.
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