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Strengthened Hyper-Raman Lines with the Coherent Superposition State |
| ZHOU Zhao-Yan; YUAN Jian-Min |
| Department of Applied Physics, National University of Defense Technology, Changsha 410073 |
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| Cite this article: |
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ZHOU Zhao-Yan, YUAN Jian-Min 2007 Chin. Phys. Lett. 24 683-686 |
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Abstract High-order harmonic generations from a one-dimensional Coulomb potential atom are calculated with the initial state prepared as a coherent superposition between its ground and first excited states. When the energy difference of the two states is small, we can choose proper laser pulse such that the first excited state can be excited only to other bound states instead of being ionized. We show that only the hyper-Raman lines are observable instead of the harmonics. The energy difference of the ground and the first excited state can be deduced from the highest peak of the hyper-Raman lines. We further show that the similar results can be obtained by using a
combination of two laser pulses with different frequencies interacting with the atom initially at the ground state.
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| Keywords:
32.80.Rm
42.50.Hz
42.65.Ky
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Received: 23 October 2006
Published: 08 February 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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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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