研究目的
Investigating the generation of single-cycle terahertz (THz) pulses via reflection of an optical femtosecond pulse train from a thin layer of nonlinear resonant medium.
研究成果
The proposed method allows for the generation of tunable single-cycle THz waves with high efficiency using a simple and compact setup. The waveshapes of the generated THz pulses can be controlled by the energy and duration of the pump pulse, as well as by the thickness of the layer.
研究不足
The method requires a plane wave front and detection in the near field. The efficiency and shape of the generated THz pulses depend on the parameters of the pump pulses and the thickness of the layer.
1：Experimental Design and Method Selection:
The study involves the reflection of an optical femtosecond pulse train from a thin layer of nonlinear resonant medium to generate single-cycle THz pulses. The method is based on coherent control of low-frequency oscillations and free induction decay in the medium.
2：Sample Selection and Data Sources:
A thin layer of nonlinear resonant medium with THz resonances is used. The medium is excited by pairs of femtosecond pulses at optical frequency.
3：List of Experimental Equipment and Materials:
The setup includes a thin layer of nonlinear resonant medium and optical femtosecond pulse trains.
4：Experimental Procedures and Operational Workflow:
The first pulse starts the low-frequency oscillations, and the second pulse stops them. The pulse duration and delay between the pulses are smaller than the relaxation time of the polarization of the medium.
5：Data Analysis Methods:
The study employs numerical simulations to analyze the generated THz pulses.
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