研究目的
To propose a method for generating circularly polarized attosecond pulses with tunable helicity from CO molecules using an unidirectionally rotating laser field, aiming to facilitate studies on chiral-specific dynamics and magnetic circular dichroism on an attosecond time scale.
研究成果
The study demonstrates a robust method for generating near-circularly polarized attosecond pulses with tunable helicity from CO molecules using an unidirectionally rotating laser field. This method opens new avenues for studying chiral-specific dynamics and magnetic circular dichroism on an attosecond time scale.
研究不足
The study is theoretical and relies on simulations. Practical implementation may face challenges such as achieving high orientation degrees of molecules and controlling laser parameters precisely.
1：Experimental Design and Method Selection:
The study uses an unidirectionally rotating laser field to interact with oriented CO molecules to generate high-order harmonics with circular polarization. The extended Lewenstein model is employed for theoretical simulations.
2：Sample Selection and Data Sources:
The CO molecule is chosen for its asymmetric molecular orbital structure, which is crucial for generating harmonics with circular polarization.
3：List of Experimental Equipment and Materials:
A focused laser beam with specific parameters (wavelength: 1300 nm, intensity: 3.0 × 10^14 W cm^-2) and a gas jet of CO molecules are used.
4：0 × 10^14 W cm^-2) and a gas jet of CO molecules are used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser field is synthesized by partially overlapping two time-delayed identical laser pulses. The harmonic spectrum is calculated using the extended Lewenstein model, and macroscopic propagation effects are simulated.
5：Data Analysis Methods:
The harmonic spectrum is analyzed for its polarization characteristics, and the attosecond pulse is synthesized by superposing harmonics in the supercontinuum region.
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