研究目的
Investigating the generation of extreme-ultraviolet attosecond pulse trains through high harmonic generation enhanced by an external, passive resonator for applications in precision spectroscopy and photoelectron spectroscopy.
研究成果
The study demonstrates the feasibility of transverse mode gating as a method for efficient XUV output coupling and highlights its potential for generating isolated attosecond pulses with high efficiency. The method shows promise for applications in ultrafast time-resolved nanoscopy of plasmonic resonances.
研究不足
The study identifies bandwidth limitations of the cavity mirror coatings as a constraint for the direct generation of isolated attosecond pulses at high repetition rates.
1：Experimental Design and Method Selection:
The study employs a 10-mirror enhancement cavity with delay mirrors to demonstrate transverse mode gating for efficient XUV output coupling and intracavity wave-front rotation.
2：Sample Selection and Data Sources:
The experiment is seeded with phase-stable,
3：4-MHz, 7-μJ, 38-fs pulses centered at 1030 nm, and harmonic radiation is generated in a neon target. List of Experimental Equipment and Materials:
Includes input coupler, highly reflective mirrors, delay mirrors with a stepped surface profile, focusing mirrors, half-wave plate, IR/XUV beam splitter, and diagnostics equipment.
4：Experimental Procedures and Operational Workflow:
The spatial dispersion is measured by imaging the mode profile near the focus for different wavelengths, and harmonic radiation is coupled out beyond 100 eV.
5：Data Analysis Methods:
Numerical modeling is used to assess the efficiency of the XUV output coupling method.
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