Time-delayed probe spectroscopy in two-photon pumped systems

A. Guzman De Garcia, P. Meystre, R. R.E. Salomaa

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We study transients in resonantly coupled three-level systems. Two of the levels are coupled by intense two-photon pumping, and the third one provides a probing level. Adiabatically eliminated levels appear in effective system parameters. Experimentally, this model is applicable, e.g., in resonantly enhanced parametric and harmonic generation in atomic vapors. A distinguishing feature in the system is the appearance of ac Stark shifts in the probe spectra when pumping at the two-photon resonance. The nutation signal is shown to give information on the effective two-photon Rabi frequency and on the decay rate of the dipole-forbidden two-photon coherence. Free-induction decay is strongly dominated by population-induced effects; Raman-like peaks introduced by Stark shifts may show large instantaneous gain. Gaussian pump pulses are investigated to investigate effects arising from the temporal sweeping of the two-photon Rabi flipping and the modulation of the Stark shifts. The results also provide relevant information on the gain dynamics of coherently pumped lasers.

Original languageEnglish (US)
Pages (from-to)1531-1540
Number of pages10
JournalPhysical Review A
Issue number3
StatePublished - 1985

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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