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Atomic coherence

About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the interplay among coexisting multi-wave-mixing (MWM) signals via multiple electromagnetically induced transparency (EIT) windows, including two ladder-type EIT windows and one V-like window in a five-level atomic system of Rb85, was observed.
Abstract: We experimentally observe the interplay among coexisting multiwave-mixing (MWM) signals via multiple electromagnetically induced transparency (EIT) windows, including two ladder-type EIT windows and one V-type EIT-like window in a five-level atomic system of Rb85. In the presence of these EIT windows, one can control the interplay between these MWM signals easily by changing the frequency detuning. Meanwhile, we also report the spatial and temporal interferences with a femtosecond time scale among three coexisting MWM signals in two overlapped EIT windows.

4 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the role of the mode number of the frequency comb near or at resonance in the temporal evolution of the atomic coherence and analyzed the effect of the number of modes on the steady-state regime through numerical calculations.

4 citations

Journal ArticleDOI
TL;DR: In this article, a femtosecond (fs) pump-probe scheme and measuring directional emission signals was used to investigate the excited-state dynamics of hydrogen (H) atoms in flames, and it was shown that the behavior of the atomic system involves atomic coherence, which is produced nonadiabatically and corresponds to a superradiant process.
Abstract: We investigate the excited-state dynamics of hydrogen (H) atoms in flames by using a femtosecond (fs) pump-probe scheme and measuring directional emission signals. An approximately 100-fs pump pulse at 205.1 nm excites H atoms through a two-photon process (n = 3 ←← n = 1), which is followed by detection of the forward emission signals induced by a broadband fs probe pulse near 656 nm. Above a certain threshold, we observe a quadratic dependence of the emission signal on the pump laser energy. Moreover, the linewidth of the forward emission signal varies with the probe delay and the probe laser energy. This behavior can be explained in terms of superradiance. We perform a theoretical analysis and compare the experimental results with the theory, and conclude that, within the conditions of our experiment, the behavior of the atomic system involves atomic coherence, which is produced non-adiabatically and corresponds to a superradiant process. Variations in the duration of the gain time window and lifetime of the excited-state H atoms in flames are explored at different flame conditions (i.e., equivalence ratio and heights above the burner). The fs pump-probe technique demonstrated here can also be extended to characterize the time-resolved population dynamics and the corresponding collisional energy transfer rates for energy levels involved in laser-induced fluorescence detection of H atoms in flames relevant to practical combustion applications.

4 citations

Proceedings ArticleDOI
TL;DR: In this paper, a slow-light beam-plitter using the rapid transport of coherence in a wall-coated atomic vapor cell under electromagnetically-induced transparency is presented.
Abstract: A slow-light beamsplitter using the rapid transport of coherence in a wall-coated atomic vapor cell under electromagnetically-induced-transparency is presented. Such a beamsplitter may improve quantum repeater performance and be useful in quantum and classical optics.

4 citations

Journal ArticleDOI
TL;DR: In this article, a two-photon laser in a cascade configuration coupled to an ordinary vacuum reservoir via a partially transmitting mirror is studied at steady-state, and the impacts of the dephasing and the phase fluctuation on the entanglement, two-mode squeezing, and intensity of the intracavity radiation are studied.
Abstract: We consider a two-photon laser in a cascade configuration coupled to an ordinary vacuum reservoir via a partially transmitting mirror. The impacts of the dephasing and the phase fluctuation on the entanglement, two-mode squeezing, and the intensity of the intracavity radiation are studied at steady-state. It so happens that the initial atomic coherence is the cause for the quantum properties of the cavity radiation even in the presence of the decoherence. We show that the dephasing rates and the phase fluctuations hurt the amount of squeezing and entanglement of the intracavity radiation. However, the dephasing rate leads to an increase in the intensity of the cavity radiation. Moreover, the phase fluctuation degrades the intensity of the intracavity radiation near to the initial maximum atomic coherence and it enhances otherwise.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202222
202121
202024
201923
201825