Ultrafast Modulation Spectroscopy in Four-Level System
- 1 June 1998
- journal article
- Published by IOP Publishing in Chinese Physics Letters
- Vol. 15 (6) , 420-422
- https://doi.org/10.1088/0256-307x/15/6/012
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 25 fs, 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.Keywords
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