Showing papers on "Atomic coherence published in 1993"
TL;DR: Atomic coherence effects within the sodium D line are shown to lead to the suppression of optical pumping, to the switching of light on and off when the coherenceeffects are turned on and on, and especially to lasing without inversion.
Abstract: Atomic coherence effects within the sodium ${\mathit{D}}_{1}$ line are shown to lead to the suppression of optical pumping, to the switching of light on and off when the coherence effects are turned on and off, and especially to lasing without inversion
174 citations
TL;DR: It is predicted that the three-level cascade atomic system, under certain conditions, exhibits almost perfect squeezing outside the cavity and it is shown that certain higher-order squeezing can also be achieved inside the cavity, under a suitable choice of different parameters.
Abstract: A three-level cascade atomic system is considered where atomic coherence can be achieved either by applying an intense pump field or initially preparing the atoms in a coherent superposition of the states. It is predicted that the system, under certain conditions, exhibits almost perfect squeezing outside the cavity. By using the steady-state Q solution it is also shown that certain higher-order squeezing can also be achieved inside the cavity, under a suitable choice of different parameters
42 citations
TL;DR: In this paper, it was shown that a coherent state of the cavity field can be generated in a micromaser with injected atoms in a coherent superposition of the upper and lower states.
Abstract: It is found that a coherent state of the cavity field can be generated in a micromaser with injected atoms in a coherent superposition of the upper and lower states. The dependence of the density matrix elements of the field on the number of injected atoms indicates that due to the same initial atomic coherence the emission of separately injected single atoms in the cavity is a cooperative process.
13 citations
TL;DR: In this article, the influence of various types of atom-wall collisions on light reflection signals monitored from vapor-dielectric interfaces was analyzed, and it was shown that atomic coherence-preserving wall collisions yield specific contributions to the reflectivity only in the absence of surface-induced dipole frequency shifts.
10 citations
TL;DR: In this paper, the authors used the recently established asymptotic solution (AS) for large fields to study squeezing in the Jaynes-Cummings model and found that most features of squeezing can be understood from the properties of the AS states, and from the observation that interference between the two branches of the wavefunction does not contribute significantly to the squeezing.
Abstract: We use the recently-established asymptotic solution (AS) for large fields to study squeezing in the Jaynes-Cummings model. Arbitrary initial atomic states (including atomic coherence) are considered. We find that most features of squeezing can be understood from the properties of the asymptotic field states, and from the observation, which we establish numerically, that for large fields the interference between the two branches of the wavefunction does not contribute significantly to the squeezing (not even near the revival times, when the two field states being superposed have very nearly the same phase). We obtain a limit on the time over which the field may show any squeezing and find that it scales as the 3/4 power of the number of photons. We also obtain a bound on the maximum achievable squeezing for a given number of photons, which is an improvement over earlier estimates. Finally, we discuss some of the shortcomings of the AS, and in particular the existence of a small ghost peak in the f...
9 citations
TL;DR: A noninversion laser system which is closed lifetime broadened and free of the restriction on atomic decay rates is proposed, but the Rabi frequency of the applied field must exceed a lower threshold for the realization of lasing without inversion.
Abstract: A noninversion laser system which is closed lifetime broadened and free of the restriction on atomic decay rates is proposed. For the realization of lasing without inversion, the Rabi frequency of the applied field must exceed a lower threshold. Moreover, the coherence term in dressed states must enhance the gain. These results are obtained beyond the specific approximations
2 citations
01 Jan 1993
TL;DR: In this article, the authors derived the master equation for the two-photon micromaser with atomic coherence, and showed that the coherence produces a bifurcation in the phase probability distribution and squeezing.
Abstract: A quick tutorial review of the coherent and squeezed states is presented. We also derive the master equation for the two-photon micromaser, with atomic coherence. We find that the atomic coherence produces a bifurcation in the phase probability distribution and squeezing. The maximun squeezing is 36% and it occurs below threshold.
1 citations
TL;DR: In this paper, the influence of lower-level coherence in atomic medium of Ξ-type energy-level scheme on the absorption and dispersion are studied in dressed states, and it is found that a weak probe light of a certain frequency can be free of atomic absorption, and at the same time has a large index of refraction.
Abstract: The influences of lower-level coherence in atomic medium of Ξ-type energy-level scheme on the absorption and dispersion are studied in dressed states. It is found that a weak probe light of a certain frequency can be free of atomic absorption, and at the same time has a large index of refraction.
1 citations
TL;DR: The quantum dynamics provides a return map in the semiclassical limit which is a function of the reduced atom-field interaction time and appears in a broad range of the parameter space.
Abstract: We study the chaotic behavior of the internal field in a micromaser with injected atomic coherence. The quantum dynamics provides a return map in the semiclassical limit which we study as a function of the reduced atom-field interaction time. Bifurcations, chaos, and transitions between bifurcation sequences appear in a broad range of the parameter space.
1 citations
01 Jan 1993
TL;DR: In this article, a simple scheme demonstrating lasing without inversion (LWI) within the Na D1 line is presented and analyzed within the hyperfine manifolds of the 3 2P1/2 and 3 2S 1/2 states.
Abstract: We present and analyze a simple scheme demonstrating lasing without inversion (LWI) within the Na D1 line, i.e., within the hyperfine manifolds of the 3 2P1/2 and 3 2S1/2 states.
01 Jan 1993
TL;DR: In this paper, the effects of atomic coherence on dynamical and field statistical properties of an atom undergoing two-photon process in a coherent field inside a lossless cavity are discussed.
Abstract: We discuss the effects of atomic coherence on dynamical and field statistical properties of an atom undergoing two-photon process in a coherent field inside a lossless cavity. The behaviour here is in contrast with an atom undergoing one-photon process in which case the Rabi oscillations are qualitatively the same for all values of coherences between the two atomic levels.