研究目的
Investigating the generation of intense terahertz emission using single or few-cycle laser pulses in a gaseous medium and its dependence on the carrier-envelope phase (CEP) of the driving laser pulse.
研究成果
Theoretical calculations demonstrate that single or few-cycle laser pulses can generate intense THz emission by a directional current, with the strongest emission at a CEP of 90 degrees. The THz wave strength increases as the pulse duration decreases.
研究不足
The study is theoretical, and practical experimental validation is needed to confirm the findings. The impact of other laser parameters and gaseous mediums on THz generation was not explored.
1：Experimental Design and Method Selection:
Theoretical calculations and semi-classical model were employed to analyze THz wave generation.
2：Sample Selection and Data Sources:
N2 molecules were considered for ionization using the Ammosov-Delone-Krainov (ADK) tunneling ionization model.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned.
4：Experimental Procedures and Operational Workflow:
The electric field of few-cycle laser pulses was represented, and the THz field was calculated as proportional to the derivative of the current density.
5：Data Analysis Methods:
The ionization rate and electric current were calculated for different CEPs and pulse durations to analyze THz wave generation.
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