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Enhancement of Bichromatic High-Order Harmonic Generation by a Strong Laser Field and Its Third Harmonic |
| PI Liang-Wen1;SHI Ting-Yun2;QIAO Hao-Xue1 |
| 1Department of Physics, Wuhan University, Wuhan 430072
2Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 |
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| Cite this article: |
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PI Liang-Wen, SHI Ting-Yun, QIAO Hao-Xue 2006 Chin. Phys. Lett. 23 1490-1493 |
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Abstract We investigate high-order harmonic generation (HHG) in a linearly polarized bichromatic field composed of a fundamental laser field with frequency ω and an additional laser field with frequency 3ω. The numerical results show that it is possible to enhance the intensity of most high harmonics in orders of magnitude. A most striking feature in the enhancement is that the intensity of several special high harmonics is practically impaired as compared with that in the monochromatic case. The qualitative explanation to the great enhancement is that the additional high-frequency field can provide new transition paths for electrons to reach the continuum. The relative phase between the fundamental field and its third harmonic field also affects the intensity of high-order harmonics near the cutoff efficiently.
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42.65.Ky
32.80.Rm
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Published: 01 June 2006
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| PACS: |
42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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