Photon echoes in optically dense media

Abstract

Coherent nonlinear multi-pulse processes, nonlinear waves and echo effects in resonant media are the topical problems of modern optics and important tools of coherent spectroscopy and quantum information science. We generalize the McCall-Hahn area theorem to the formation of an arbitrary photon echo generated during the multi-pulse excitation of the optically dense resonant media. The derived theorem made it possible to reveal the nonlinear mechanism of generation and evolution of the photon echo signals inside the media after a two-pulse excitation. We find that a series of self-reviving echo signals with total area of $2\pi$ or $0\pi$ is excited and propagates in the media depth, with each pulse having an individual area less than $\pi$. The resulting echo pulse train is a new alternative to the well-known soliton or breather. The developed pulse-area approach paves the way for more precise coherent spectroscopy, studies of different photon echo signals and quantum control of light pulses in the optically dense media.

arXiv comment7 pages, 3 figures including Supplemental material

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• Photon echo in ring cavity: pulse area approach
• Exponential enhancement of sensitivity in Ramsey interferometry with optically thick ensemble of atoms
• Real-time ab initio description of the photon-echo mechanisms in extended systems: the case study of bulk GaAs