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Physica E Low-dimensional Systems and Nanostructures

Inhibition and enhancement of two-photon absorption in a four-level inverted-Y semiconductor quantum well system

Zhiping Wang, Benli Yu, Feng Xu, Shenglai Zhen, Xuqiang Wu, Jun Zhu, Zhigang Cao

Published Feb 10, 2012• 18 citations
Publisher
DOI
10.1016/j.physe.2012.01.025

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We analyze nonlinear excitation in a four-level atomic system that exhibits electromagnetically induced transparency induced by a strong coupling laser. We show that, at the line center of the atomic transition, the nondegenerate two-photon excitation in the dressed states can be enhanced by constructive quantum interference in two excitation paths while the linear absorption is inhibited by destructive quantum interference. We report an experimental study of the interference-enhanced two-photon absorption in a multilevel Λ-type rubidium atomic system and compare the measurements with the theoretical calculations.
We theoretically investigate the features of two-photon absorption in a coherently driven four-level atomic system with closed-loop configuration. It is found that two-photon absorption can be completely suppressed just by properly adjusting the relative phase of four coherent low-intensity driving fields and the atomic system becomes transparent against two-photon absorption. From a physical point of view, we explicitly explain these results in terms of quantum interference induced by two different two-photon excitation channels.