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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.


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Journal ArticleDOI
TL;DR: In this article, a magic frequency associated with two-photon processes in room temperature atomic vapour at the coherent population trapping (CPT) condition for an elliptically polarized light is realized by combining the symmetries of the lineshape functions arising from the atomic coherence.
Abstract: We present a magic frequency associated with two-photon processes in room temperature atomic vapour at the coherent population trapping (CPT) condition for an elliptically polarized light. It is realized by combining the symmetries of the lineshape functions arising from the atomic coherence. In practice, the magic frequency is synthesized from a polarimetric measurement involving the reflected and transmitted CPT signal at the polarizing beam splitter, which provides an atomic frequency standard for near zero magnetic fields. We further develop a magnetometer, which concurrently measures the magnetic field and its direction from the enhanced reflected signal with significantly improved performance. Additionally, the magic frequency and its dependence on the polarization content provide a handle to precisely locate the single photon resonance.

6 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical model of a microscopic laser system incorporating two identical atoms coupled to a single resonator mode is investigated in detail, and it is established that a dramatic improvement in laser quality results from the addition of a second atom into the cavity.
Abstract: A theoretical model of a microscopic laser system incorporating two identical atoms coupled to a single resonator mode is investigated in detail. It is established that a dramatic improvement in laser quality results from the addition of a second atom into the cavity. The enhanced laser action, arising from a cavity-induced mutual atomic coherence, is inferred from comprehensive studies of the steady-state and dynamical properties of the cavity output field. Evidence of laser action is also found in the fluorescence field where position-dependent spectral profiles occur. Counterintuitively, we establish that antibunching phenomena in the fluorescence can be enhanced by incoherent pumping.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of injected atomic coherence on the atomic emission probability of the micromaser injected with ultracold cascade three-level atoms by considering that the atoms are initially in the coherent superposition states of the two upper levels were investigated.
Abstract: We investigate the effects of the injected atomic coherence on the atomic emission probability of the micromaser injected with ultracold cascade three-level atoms by considering that the atoms are initially in the coherent superposition states of the two upper levels We show that there is no interference between the transitions from the two upper levels to the lowest level In the large atom-field-detuning case, the atomic emission probability decreases as the coherent parameter increases In the zero atom-field-detuning case, the atomic emission probability has three sets of resonance peaks The reason for these results has been explained

6 citations

Journal ArticleDOI
TL;DR: In this article, the lower level of the usual two-level atom is replaced by a coherently prepared doublet, i.e., a λ quantum-beat configuration.
Abstract: Amplitude-noise reduction and diminished losses are found in a laser system in which the lower level of the usual two-level atom is replaced by a coherently prepared doublet, i.e., a λ quantum-beat configuration. The role of atomic coherence between the various levels and regular pumping is investigated. When a portion of the output signal is reflected from a phase-conjugate mirror and reinjected into the laser, the locking phase can be altered and a large phase-noise reduction can be obtained

6 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigate the dynamics of entanglement between two atoms in a double two-photon Jaynes-Cummings model when the cavity field is previously in a maximally entangled state.

6 citations


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