期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.055004
关键词
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资金
- Government of the Russian Federation [14.B25.31.0008]
- Ministry of Education and Science of the Russian Federation [14.B37.21.0770]
- Russian Foundation for Basic Research [11-02-01416, 12-02-31424, 12-01-31270, 12-02-33087, 12-02-12101, 13-02-00964]
We investigate for the first time, both experimentally and theoretically, low-frequency terahertz (THz) emission from the ambient air ionized by a two-color femtosecond laser pulse containing, besides the fundamental-frequency main field, a weak additional field tunable near the frequency of the half harmonic. By controlling the mutual polarization and the powers of the main and additional fields, we determine the dependences of the THz power and polarization on the parameters of the two-color pulse. We also discover the resonantlike dependence of the THz yield on the frequency detuning of the additional field. The analytical formulas obtained using the model of the free-electron residual current density give an excellent agreement with the experimental results.
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