研究目的
Investigating the mechanism whereby positively chirped optical pulses lead to the maximum THz yield in two-color femtosecond filamentation in air.
研究成果
The study demonstrates that positively chirped optical pulses lead to the maximum THz yield in two-color femtosecond filamentation in air due to better preservation of the overlap between the x- and 2x-pulses. The THz yield is highly sensitive to the temporal overlap between the pulses, with a small shift significantly affecting the yield. The findings provide insights into optimizing THz generation using chirped pulses.
研究不足
The study is limited to the use of air as the medium for THz generation and focuses on the effect of pulse chirp on THz yield. The simulations and experiments are conducted under specific conditions, and the results may not be generalizable to other media or conditions.
1：Experimental Design and Method Selection:
The study involves comparing spatio-temporal propagation simulations with experiments on THz generation using two-color optical excitation in air. The methodology includes the use of a Ti:Sa laser system to produce 800-nm pulses, which are then chirped both positively and negatively. The pulses are focused and passed through a BBO crystal to generate the second harmonic. The THz radiation emitted is collected and measured.
2：Sample Selection and Data Sources:
The experiments use air as the medium for THz generation. The data sources include the measured THz energy yield as a function of the chirped pulse duration.
3：List of Experimental Equipment and Materials:
Ti:Sa laser system, BBO crystal, lens, parabolic mirrors, Golay cell, PTFE and Si filters.
4：Experimental Procedures and Operational Workflow:
The Ti:Sa beam is focused, passed through a BBO crystal to generate the second harmonic, and the resulting THz radiation is collected and measured. The chirp of the 800-nm pulse is varied to study its effect on THz yield.
5：Data Analysis Methods:
The THz energy yield is analyzed as a function of the chirped pulse duration. Simulations using the unidirectional pulse propagation equation (UPPE) are compared with experimental results.
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