研究目的
Investigating the characteristic scale of spread of the plasma formed on the surface of a bulk iron target irradiated by a femtosecond laser pulse with an intensity of 1016 W cm–2.
研究成果
The study demonstrated that time-resolved interference microscopy is efficient in measuring the characteristic scale of plasma spread. It was shown that the displacement of a plasma layer with a density exceeding critical does not exceed 30 nm, indicating that vacuum heating may be the dominant mechanism of electron acceleration under the experimental conditions.
研究不足
The study is limited by the assumption of linear approximation in evaluating the plasma inhomogeneity scale and the sensitivity of plasma expansion to the prepulse shape.
1：Experimental Design and Method Selection:
Time-resolved interference microscopy was used to measure the characteristic scale of plasma spread. The technique involves using femtosecond pulses emitted by a Cr : forsterite laser system with an intensity contrast of
2：Sample Selection and Data Sources:
1 A bulk iron target was used as the sample. The target was irradiated by a femtosecond laser pulse.
3：List of Experimental Equipment and Materials:
The equipment includes a terawatt femtosecond IR laser system based on an active Cr : forsterite element, a delay line, a spatial filter, a set of neutral light filters, a microlens, a parabolic mirror, a vacuum chamber, and a CCD camera.
4：Experimental Procedures and Operational Workflow:
The pump-probe scheme was employed where laser radiation is divided into pump and probe beams. The delay time between the pump and probe pulses was varied to study the dynamics of preplasma formation and expansion.
5：Data Analysis Methods:
The spatial distribution of the phase of complex reflection coefficient was analyzed to determine the changes in the plasma layer.
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