Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations
Abstract Mixing the fundamental (ω) and the second harmonic (2ω) waves in the gas phase is a widely employed technique for emitting terahertz (THz) pulses. The THz generation driven by bi-chromatic fields can be described by the photocurrent model, where the THz generation is attributed to free elec...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-12-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-024-01893-2 |
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| author | Jingjing Zhao Yizhu Zhang Yanjun Gao Meng Li Xiaokun Liu Weimin Liu Tian-Min Yan Yuhai Jiang |
| author_facet | Jingjing Zhao Yizhu Zhang Yanjun Gao Meng Li Xiaokun Liu Weimin Liu Tian-Min Yan Yuhai Jiang |
| author_sort | Jingjing Zhao |
| collection | DOAJ |
| description | Abstract Mixing the fundamental (ω) and the second harmonic (2ω) waves in the gas phase is a widely employed technique for emitting terahertz (THz) pulses. The THz generation driven by bi-chromatic fields can be described by the photocurrent model, where the THz generation is attributed to free electrons ionized by the ω field, and the 2ω field provides a perturbation to break the symmetry of the asymptotic momentum of free electrons. However, we find that the THz radiation is amplified by one order of magnitude when driven by bi-focal bi-chromatic fields, which cannot be explained only using the photocurrent model. Meanwhile, present measurements demonstrate that the THz radiation mainly originates from the plasma created by the 2ω pulses instead of the ω pulses. Energy transfer from the 2ω beam to the THz beam during the THz generation has been observed, validating the major contribution of the 2ω beam. Furthermore, the THz bandwidth has been observed to extensively exceed the bandwidth of the pump pulse, not be explained by the photocurrent model as well. These counterintuitive results present a significant challenge for understanding strong-field nonlinear optics and simultaneously expanding various applications. |
| format | Article |
| id | doaj-art-8f938f8ec88f4f8b8a1ff025c800475c |
| institution | OA Journals |
| issn | 2399-3650 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-8f938f8ec88f4f8b8a1ff025c800475c2025-08-20T02:32:26ZengNature PortfolioCommunications Physics2399-36502024-12-01711610.1038/s42005-024-01893-2Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiationsJingjing Zhao0Yizhu Zhang1Yanjun Gao2Meng Li3Xiaokun Liu4Weimin Liu5Tian-Min Yan6Yuhai Jiang7Shanghai Advanced Research Institute, Chinese Academy of SciencesSchool of Electrical Engineering, Tiangong UniversityShanghai Advanced Research Institute, Chinese Academy of SciencesCenter for Transformative Science and School of Physical Science and Technology, ShanghaiTech UniversityCenter for Transformative Science and School of Physical Science and Technology, ShanghaiTech UniversityCenter for Transformative Science and School of Physical Science and Technology, ShanghaiTech UniversityShanghai Advanced Research Institute, Chinese Academy of SciencesShanghai Advanced Research Institute, Chinese Academy of SciencesAbstract Mixing the fundamental (ω) and the second harmonic (2ω) waves in the gas phase is a widely employed technique for emitting terahertz (THz) pulses. The THz generation driven by bi-chromatic fields can be described by the photocurrent model, where the THz generation is attributed to free electrons ionized by the ω field, and the 2ω field provides a perturbation to break the symmetry of the asymptotic momentum of free electrons. However, we find that the THz radiation is amplified by one order of magnitude when driven by bi-focal bi-chromatic fields, which cannot be explained only using the photocurrent model. Meanwhile, present measurements demonstrate that the THz radiation mainly originates from the plasma created by the 2ω pulses instead of the ω pulses. Energy transfer from the 2ω beam to the THz beam during the THz generation has been observed, validating the major contribution of the 2ω beam. Furthermore, the THz bandwidth has been observed to extensively exceed the bandwidth of the pump pulse, not be explained by the photocurrent model as well. These counterintuitive results present a significant challenge for understanding strong-field nonlinear optics and simultaneously expanding various applications.https://doi.org/10.1038/s42005-024-01893-2 |
| spellingShingle | Jingjing Zhao Yizhu Zhang Yanjun Gao Meng Li Xiaokun Liu Weimin Liu Tian-Min Yan Yuhai Jiang Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations Communications Physics |
| title | Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations |
| title_full | Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations |
| title_fullStr | Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations |
| title_full_unstemmed | Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations |
| title_short | Temporal-spatial manipulation of bi-focal bi-chromatic fields for terahertz radiations |
| title_sort | temporal spatial manipulation of bi focal bi chromatic fields for terahertz radiations |
| url | https://doi.org/10.1038/s42005-024-01893-2 |
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