Field dynamics, instabilities and noise squeezing in the one-photon and two-photon correlated emission laser and two-photon micromaser.
Item
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Title
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Field dynamics, instabilities and noise squeezing in the one-photon and two-photon correlated emission laser and two-photon micromaser.
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Identifier
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AAI9707169
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identifier
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9707169
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Creator
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Zhang, Jian.
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Contributor
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Adviser: Janos Bergou
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Date
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1996
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, General | Physics, Optics
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Abstract
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The influence of injected atomic coherence on laser operation is discussed by analyzing the equations of motion of this system. Both stationary steady states and time-dependent regimes of operation are investigated. For small cavity-field detuning and large atomic coherence phase locking occurs. Under certain conditions, in the inverted regime the output intensity is an S-shaped function of the atomic coherence leading to the possibility of a bistable behavior. When the detuning is larger than a critical value there is no phase locking. We find that the time-dependent behavior of the laser intensity in this case is oscillatory (quasiperiodic). There is a small parameter region where a stationary steady state and an oscillatory state may coexist. We find that in steady state the intensity noise can be suppressed below the shot--noise limit but the phase fluctuations are not affected by pump regularity. For nonzero detuning, we find that transient squeezing of the phase fluctuations is possible.;Both stationary and time-dependent regimes of operation, instabilities, and phase squeezing are investigated in the off-resonant two-photon correlated-spontaneous-emission laser (CEL) by numerical calculation. Initial atomic coherence plays an essential role in lasing without population inversion, phase locking and phase noise squeezing in the system. The field evolution and dynamics are studied. Furthermore, phase noise reduction near bistable areas is also investigated. In addition to the lower branch, where it has been known to exist from previous studies, phase squeezing is also found on the upper branch both with and without population inversion, thus generating a bright source of phase noise squeezed light.;A master equation for the two-photon micromaser with the injected atomic coherence is derived. The photon statistics for the fully excited, partially excited and deexcited two-photon micromaser without coherence is studied. The spectrum is investigated by using Green's function to calculate the two-time correlation function of the micromaser field. We show the influence of the thermal mean photon number on the spectrum of the two-photon micromaser.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
