研究目的
Investigating the characteristic size of plasma density inhomogeneity on the surface of bulk iron target formed under the action of high-power femtosecond laser pulses.
研究成果
The study successfully demonstrates the use of time-resolved interference microscopy to measure the characteristic size of plasma inhomogeneity on an iron target surface, finding it to be less than 30 nm. This suggests vacuum heating as the prevailing electron acceleration mechanism under the given conditions.
研究不足
The accuracy of phase change determination is affected by the Fourier method's precision and the error in setting zero delay. The study assumes certain conditions for phase change contributions which may not account for all physical phenomena.
1：Experimental Design and Method Selection:
The study employs time-resolved interference microscopy to investigate plasma formation and expansion on an iron target surface under femtosecond laser pulse exposure.
2：Sample Selection and Data Sources:
A bulk cylindrical sample of iron with specific dimensions and surface roughness is used.
3：List of Experimental Equipment and Materials:
Includes a chromium:forsterite laser system, Michelson interferometer, CCD camera (SensiCam QE, PCO), and various optical components.
4：Experimental Procedures and Operational Workflow:
The setup involves a pump-probe scheme with precise delay control, spatial filtering, and interferogram recording.
5：Data Analysis Methods:
Fourier method of interferogram processing is used to analyze phase changes in the reflected probe radiation.
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