研究目的
Investigating the influence of intensity ratio of the two driving laser fields on the cutoff of the high-order harmonics.
研究成果
The harmonic cutoff position is affected by the intensity ratios of the two driving laser fields. As the intensity ratio increases, the harmonic cutoff position becomes shorter due to the shorter distances traveled by the electrons, resulting in less energy gain. The findings are supported by time-frequency analysis and recollision trajectories.
研究不足
The study is theoretical and does not involve experimental validation. The limitations include the assumptions made in the theoretical model and the simplifications in the simulation setup.
1：Experimental Design and Method Selection:
The study involves solving a two-dimensional time-dependent Schr?dinger equation (TDSE) for the helium atom driven by a bicircular counter-rotating circularly polarized (BCCP) laser field.
2：Sample Selection and Data Sources:
The helium atom is used as the sample.
3：List of Experimental Equipment and Materials:
The study is theoretical and does not involve physical equipment.
4：Experimental Procedures and Operational Workflow:
The TDSE is solved using the second-order splitting-operator method. The computation space grid is
5：6 a.u., with dx = dy = 4 a.u. The time step is 1 a.u. A mask function is used to avoid reflection of wave functions at the boundary. Data Analysis Methods:
4 The HHG spectrum is obtained from the Fourier transformation of the induced temporal dipole.
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