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Chaos Solitons & Fractals

Manipulation of spontaneous emission by 2π pulses

Marlan O. Scully, Shi-Yao Zhu, Muhammad Suhail Zubairy

Published Dec 2, 2002• 4 citations
Publisher
DOI
10.1016/s0960-0779(02)00301-6

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Amplified spontaneous emission is a common noise source in active optical systems, it is generally seen as being an incoherent process. Here we excite an ensemble of rare earth ion dopants in a solid with a π pulse, resulting in amplified spontaneous emission. The application of a second π pulse leads to a coherent echo of the amplified spontaneous emission that is correlated in both amplitude and phase. For small optical thicknesses, we see evidence that the amplified spontaneous emission and its echo are entangled.
In a solid-state ensemble of rare-earth ions, we have experimentally generated a photon-echo of a spontaneous emission event, a process referred to as rephased amplified spontaneous emission (RASE). An enabling step for this demonstration was to use a double-Λ energy level structure for the photon-echo, rather than a standard two-pulse/two-level photon echo sequence, such that the single-photon echo is spectrally and spatially distinguishable from the coherent emission that follows imperfect π-pulses.