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Journal of Physics B Atomic Molecular and Optical Physics

One-photon-cascade spectrum in a two-photon-pumped three-level system

Z Chen, Helen S. Freedhoff

Published Feb 14, 1990• 0 citations
Publisher

Abstract

The top level of a three-level atom is populated by resonant two-photon optical pumping from the bottom level by a field intense enough to produce dynamic Stark splitting. The frequencies and intensities are calculated for the one-photon cascade emission to the ground state via a nearly resonant intermediate level. Two strong (shifted) doublets near the atomic frequencies, and a weaker triplet centred at the laser frequency are predicted.

DOI
10.1088/0953-4075/23/3/001

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The top level of a three-level atom is populated by resonant two-photon optical pumping from the bottom level by a field intense enough to produce dynamic Stark splitting. The frequencies and intensities are calculated for the one-photon cascade emission to the ground state via a nearly resonant intermediate level. Two strong (shifted) doublets near the atomic frequencies, and a weaker triplet centred at the laser frequency are predicted.
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Studies the competition between absorption and stimulated emission induced by two laser fields at low intensities interacting on a two-photon resonance with a three-level atom. The induced spectrum into the ground state consists of a peak whose height and asymmetry depend strongly on the detuning. The spectra arising from the emission of a laser photon by the excited state consists of two peaks describing stimulated emission and induced absorption, respectively, where the former dominates the latter for small values of the Rabi frequencies but for higher ones, they cancel each other out.
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An experiment was performed recently [Y. Zhu, A. Lezama, Q. Wu, and T. W. Mossberg (unpublished)] in which a two-level atom of transition frequency \ensuremath{\Omega} was placed in a bichromatic laser field with frequencies \ensuremath{\Omega}\ifmmode\pm\else\textpm\fi{}\ensuremath{\delta}, of sufficient intensity to produce dynamic Stark splitting. The observed fluorescence spectrum differed qualitatively in almost all its details from the well-known Mollow triplet [B. R. Mollow, Phys. Rev. 188, 1969 (1969)]. In this article, we use a dressed-atom model to explain the observed results.
We have calculated the excitation spectra of a single electron in the excited state of a four-level atom interacting with three laser fields at low intensities, where two of them are on two-photon resonance with the three levels of the atom, while the third laser is a weak one operating between the fourth and excited level of the atom. It is shown that light is switched off at certain frequency due to the coherent population trapping while light is turned on at another frequency, where stimulated emission occurs leading to light amplification without population inversion.