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Ultrafast Modulation Spectroscopy in Four-Level System |
| YU Zu-he;MI Xin;JIANG Qian;LI Xiao-feng;FU Pan-ming |
| Laboratory of Optical Physics, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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YU Zu-he, MI Xin, JIANG Qian et al 1998 Chin. Phys. Lett. 15 420-422 |
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Abstract Based on the interference between two two-photon processes, we reported a four-level ultrafast modulation spectroscopy in Na vapor, where 3S, 3P, 5S, and 4D formed a four-level system. We studied the temporal behavior of the four-wave mixing signal intensity and obtained signal modulation with period 25fs, corresponding to the splitting between 5s and 4D. This technique can achieve Doppler-free precision in the measurement of the energy level splitting between two excited states which are dipolar forbidden from the ground state.
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| Keywords:
42.65.Hw
32.90.+a
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Published: 01 June 1998
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| PACS: |
42.65.Hw
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(Phase conjugation; photorefractive and Kerr effects)
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32.90.+a
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(Other topics in atomic properties and interactions of atoms with photons)
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