研究目的
To reconstruct Attosecond Pulse Trains (APT) generated by high-harmonic generation (HHG) using a 100 kHz laser system at ELI-ALPS and to demonstrate the RABBIT technique in the presence of an additional IR field temporally locked to the APT.
研究成果
The RABBIT technique was successfully tailored to work with an additional IR pulse temporally locked to the XUV APT, demonstrating identical information encoding as in standard RABBIT schemes. This method simplifies future attosecond pulse metrology and measurements of attosecond photoionization delays at high repetition rates and high average powers.
研究不足
The high average power of the laser system posed challenges in managing thermal loads on optics and the fragility of metallic foils used for filtering XUV light. The inability to filter IR from XUV led to high average IR powers being incident on the XUV mirror, causing thermal expansion.
1：Experimental Design and Method Selection:
The RABBIT technique was used to reconstruct APT's generated by HHG. The methodology involved the use of a high-repetition-rate laser system and the analysis of photoelectron spectra with an additional IR field.
2：Sample Selection and Data Sources:
Neon was used as the target gas for photoionization. The photoelectron spectra were recorded using a time-of-flight spectrometer.
3：List of Experimental Equipment and Materials:
The HR-1 laser system, XUV spectrometer, time-of-flight spectrometer, water-cooled apertures, and custom-made XUV multi-layer mirror were used.
4：Experimental Procedures and Operational Workflow:
The laser light was focused for HHG, and the emitted harmonics and co-propagating IR fields were analyzed. The time delay between XUV and IR pulses was adjusted using a piezo-controlled stage.
5：Data Analysis Methods:
The phase of the 2ω oscillation in each sideband was extracted by Fourier transformation along the temporal-delay axis.
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