研究目的
Investigating the effects of pre-plasmas on energetic electrons generated in laser–solid interactions.
研究成果
The optical interferometry with the vertical single probe path and the modified M–Z interferometer has been successfully used in multiple campaigns, allowing more diagnostics to be simultaneously fielded than the horizontal probe path would have. The plasma density measurements provided valuable data to benchmark radiation-hydrodynamic simulation.
研究不足
The optical interferometry is underutilized in high-intensity SP laser interactions with solid targets due to the time-consuming setup and the probe beam path preventing other diagnostics from being deployed.
1：Experimental Design and Method Selection:
The interferometry setup employs a modified Mach–Zehnder interferometer and a single vertical probe beam path to maximize the use of target chamber space. The data is analyzed using Fourier transformation and linear operator methods.
2：Sample Selection and Data Sources:
Targets made of aluminum (Al), titanium (Ti), copper (Cu), gold (Au), and plastics (CH) were used in disk or square form.
3：List of Experimental Equipment and Materials:
The Titan SP laser, a frequency doubled optical probe beam, a modified Mach–Zehnder interferometer, and a Hamamatsu visible streak camera (C7700-11) were used.
4：Experimental Procedures and Operational Workflow:
The relative timing between the SP and probe lasers was adjusted using a timing periscope while monitoring with a streak camera. The probe beam was compressed to the minimum pulse length of ~0.5 ps for snapshots of pre-plasmas.
5：5 ps for snapshots of pre-plasmas.
Data Analysis Methods:
5. Data Analysis Methods: The phase difference was estimated using the Fourier transformation method, and the plasma index of refraction was calculated using the linear operator method.
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