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Ultrahigh Harmonic Generation from an Atom with Superposition of Ground State and Highly Excited States |
| YANG Yu-Jun1,2;CHEN Ji-Gen3;CHI Fang-Ping2;ZHU Qi-Ren2;ZHANG Hong-Xing1;SUN Jia-Zhong1 |
| 1Institute of Theoretical Chemistry, Jilin University, Changchun 1300122Institute of Atomic and Molecular Physics, Jilin University, Changchun 1300123Department of Physics, Taizhou University, Linhai 317000 |
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| Cite this article: |
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YANG Yu-Jun, CHEN Ji-Gen, CHI Fang-Ping et al 2007 Chin. Phys. Lett. 24 1537-1540 |
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Abstract We investigate the high-order harmonic generation from an atom prepared in a superposition of ground state and highly excited state. When the atom is irradiated by an ultrashort pulse, the cutoff position of the plateau in the harmonic spectrum is largely extended compared with the case that the atom is initially in the ground state. The physics of the extension of the high-order harmonic plateau can be interpreted by the spatial structure of the atomic initial wave packet. We can optimize the generation of high-order harmonics by substituting the excited state for a particular coherent superposition of some highly excited states to form a spatially localized excited wave packet.
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32.80.Rm
42.65.Ky
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Received: 20 December 2006
Published: 17 May 2007
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| PACS: |
32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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