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  • Journal article
    NAGAMINE K, MIYAKE Y, SHIMOMURA K, BIRRER P, MARANGOS JP, IWASAKI M, STRASSER P, KUGA Tet al., 1995,

    ULTRASLOW POSITIVE-MUON GENERATION BY LASER IONIZATION OF THERMAL MUONIUM FROM HOT TUNGSTEN AT PRIMARY PROTON-BEAM

    , PHYSICAL REVIEW LETTERS, Vol: 74, Pages: 4811-4814, ISSN: 0031-9007
  • Journal article
    DUTRA SM, KNIGHT PL, 1995,

    ON THE GENERATION OF BESSEL BEAMS BY SPONTANEOUS EMISSION IN A PLANAR MICRO-CAVITY

    , OPTICS COMMUNICATIONS, Vol: 117, Pages: 256-261, ISSN: 0030-4018
  • Journal article
    POSTHUMUS JH, FRASINSKI LJ, GILES AJ, CODLING Ket al., 1995,

    DISSOCIATIVE IONIZATION OF MOLECULES IN INTENSE LASER FIELDS - A METHOD OF PREDICTING ION KINETIC ENERGIES AND APPEARANCE INTENSITIES

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 28, Pages: L349-L353, ISSN: 0953-4075
  • Journal article
    VITANOV NV, KNIGHT PL, 1995,

    COHERENT EXCITATION BY ASYMMETRIC PULSES

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 28, Pages: 1905-1920, ISSN: 0953-4075
  • Journal article
    FICEK Z, DALTON BJ, KNIGHT PL, 1995,

    Fluorescence intensity and squeezing in a driven three-level atom: Ladder case.

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 4062-4077, ISSN: 1050-2947

    A theoretical study is made of the steady-state intensity and squeezing properties of the fluorescent light from a three-level-atom system in a ladder configuration, which is subject to spontaneous-emission decay to the electromagnetic-field vacuum. Two cases are examined: in the equispaced (ES) level case, the two atomic transition frequencies are nearly equal and two photon absorption processes occur from a single coherent laser field that couples both transitions and has a small detuning from each; in the non- equispaced (NES) level case, the atomic transition frequencies are rather different and two photon absorption processes occur from two coherent laser fields, each coupled to a single transition and in near resonance with it. In both cases, a situation of small two-photon detuning occurs. Optical Bloch equations for the atomic density matrix in rotating frames are given and matrix expressions for determining the steady-state populations and coherences are obtained. Analytic expressions are also given for special cases. The fluorescent intensity is obtained from the populations of the intermediate and upper states, with the normally ordered variance (NOV) for quadrature components of the fluorescent field involving, in addition, the atomic coherences. The fluorescent intensities are shown graphically as a function of two-photon detuning for a variety of one-photon detunings and Rabi frequencies for the ES and NES cases.In both cases, the fluorescent intensities show the well known resonances from the upper state at zero two-photon detuning and from the intermediate state at zero one-photon detuning for the lower transition. However, further resonances are also found. The intermediate-state intensity displays a resonance at zero two-photon detuning. Also, the upper-state intensity shows a resonance at zero one-photon detuning for the upper transition, but only for the NES case; evidently, the transfer rate from upper to lower transition coherences destroys thi
  • Journal article
    EKERT A, KNIGHT PL, 1995,

    ENTANGLED QUANTUM-SYSTEMS AND THE SCHMIDT DECOMPOSITION

    , AMERICAN JOURNAL OF PHYSICS, Vol: 63, Pages: 415-423, ISSN: 0002-9505
  • Journal article
    AVERBUKH V, MOISEYEV N, 1995,

    CUTOFF IN MOLECULAR HARMONIC-GENERATION SPECTRA RESULTING FROM CLASSICAL CHAOTIC DYNAMICS

    , PHYSICAL REVIEW A, Vol: 51, Pages: 3911-3915, ISSN: 1050-2947
  • Journal article
    SZYMANOWSKI C, KEITEL CH, DALTON BJ, KNIGHT PLet al., 1995,

    SWITCHING BETWEEN RAYLEIGH-LIKE AND LORENTZIAN LINESHAPES OF THE DISPERSION IN DRIVEN 2-LEVEL ATOMS

    , JOURNAL OF MODERN OPTICS, Vol: 42, Pages: 985-1003, ISSN: 0950-0340
  • Journal article
    STEINBACH J, GARRAWAY BM, KNIGHT PL, 1995,

    High-order unraveling of master equations for dissipative evolution

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 3302-3308, ISSN: 1050-2947

    We show how the quantum trajectory method for describing the dissipative evolution of conditioned states can be implemented in a numerically efficient higher-order unraveling that goes beyond the Euler method usually employed in such simulations. We demonstrate its applicability through an analysis of spontaneous emission and find that improvements by two orders of magnitude are possible for the specific example addressed.
  • Journal article
    NEW GHC, 1995,

    THE ORIGIN OF EXCESS NOISE

    , JOURNAL OF MODERN OPTICS, Vol: 42, Pages: 799-810, ISSN: 0950-0340
  • Journal article
    DHOLAKIA K, HORVATH GZK, POWER W, SEGAL DM, THOMPSON RCet al., 1995,

    INVESTIGATION OF ION DYNAMICS IN A PENNING TRAP USING A PULSE-PROBE TECHNIQUE

    , APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 60, Pages: 375-382, ISSN: 0946-2171
  • Journal article
    BUZEK V, KEITEL CH, KNIGHT PL, 1995,

    Sampling entropies and operational phase-space measurement. I. General formalism

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 2575-2593, ISSN: 1050-2947

    We present an entropic description of quantum-mechanical states based on an operational approach to a phase-space measurement. We give a simple phase-space interpretation of sampling entropies in terms of which we derive very general entropic uncertainty relations reflecting the degree of the phase-space uncertainty of the quantum-mechanical state in the given measurement (i.e., for a given ‘‘quantum-ruler’’ state). We relate the sampling entropy to the von Neumann and Shannon entropy and show that the Wehrl entropy represents a particular example of a sampling entropy when the quantum ruler is represented by coherent states.
  • Journal article
    BUZEK V, KEITEL CH, KNIGHT PL, 1995,

    Sampling entropies and operational phase-space measurement. II. Detection of quantum coherences

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 2594-2601, ISSN: 1050-2947

    We use the operational phase-space distributions and sampling entropies developed in the preceding paper [V. Bužek, C. H. Keitel, and P. L. Knight, Phys. Rev. A 51, 2575 (1995)] to discuss the nature of quantum interference between components of superpositions of states. We show how the Wehrl entropy, a special case of the sampling entropy, is a useful discriminator between different kinds of superpositions and of statistical mixtures, and is determined essentially by the coherent-state content. Apart from interference terms, this content is given by the quantum uncertainty of a single coherent state and the classical contribution to the number of coherent states necessary to tile the dominant phase-space ‘‘patch’’ representing the quantum state of interest. We illustrate these ideas using nonclassical superpositions of coherent states, where interference modifies the phase-space distributions, and show how these features are sensitive to dissipation.
  • Journal article
    Hinds EA, Sangster K, Barnett SM, Riis E, Sinclair AGet al., 1995,

    Aharonov-Casher phase in an atomic system

    , Physical Review A, ISSN: 1050-2947
  • Journal article
    Hinds EA, Sauer BE, Wang J, 1995,

    Anomalous Spin-Rotation Coupling in the X^2Σ+ State of YbF

    , Physical Review Letters, ISSN: 0031-9007
  • Journal article
    KEITEL CH, KNIGHT PL, 1995,

    Monte Carlo classical simulations of ionization and harmonic generation in the relativistic domain

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 1420-1430, ISSN: 1050-2947

    The magnetic-field component of a very intense laser field interacting with an atom cannot normally be neglected for intensities that lead to relativistic velocities of the electrons. Here we investigate stabilization and harmonic generation in this relativistic regime from a three-dimensional hydrogen atom modeled as a classical system with a distribution of initial conditions derived from a Monte Carlo average. Particular emphasis is placed on the problems of ionization in the direction of propagation of the applied laser field, which will be shown to arise from the inclusion of the magnetic-field component of the laser field. In the harmonic spectra, Doppler shifting occurs for observation directions orthogonal to the direction of laser-field propagation. Retardation effects show up in the harmonic spectra in the forward direction and inhibit the magnetic-field effects of the free-electron contribution of the forward-direction spectrum. In general, few harmonics are observed in our single-atom treatment because of the magnetically induced three-dimensional motion of the electron for intensities approaching the relativistic regime, and because of high ionization probabilities, i.e., also the breakdown of stabilization, for strongly relativistic laser intensities.
  • Journal article
    MIYAKE Y, MARANGOS JP, SHIMOMURA K, BIRRER P, KUGA T, NAGAMINE Ket al., 1995,

    LASER SYSTEM FOR THE RESONANT IONIZATION OF HYDROGEN-LIKE ATOMS PRODUCED BY NUCLEAR-REACTIONS

    , NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Vol: 95, Pages: 265-275, ISSN: 0168-583X
  • Journal article
    Kim MS, 1995,

    Photon statistics in two-photon linear amplifiers

    , Optics Communications, Vol: 114, Pages: 262-268, ISSN: 0030-4018
  • Journal article
    LI JY, NEW GHC, SMITH K, OBRO Met al., 1995,

    THEORY OF A FIBER RING LASER MODE-LOCKED BY CROSS-PHASE MODULATION

    , OPTICS COMMUNICATIONS, Vol: 114, Pages: 119-124, ISSN: 0030-4018
  • Journal article
    Roach TM, Abele H, Boshier MG, Grossman HL, Zetie KP, Hinds EAet al., 1995,

    Realization of a magnetic mirror for cold atoms

    , Physical Review Letters, Vol: 75, Pages: 629-632, ISSN: 0031-9007

    We have demonstrated that cold atoms can be retroflected from a ferromagnetic surface by the Stern-Gerlach effect. When the surface is magnetized periodically, the reflectivity for suitably polarized atoms is (948)% and the reflection is specular. A demagnetized surface is also highly reflecting but the reflections are diffuse. These magnetic processes are of interest for atom optics because they permit the manipulation of cold atoms without the use of laser beams. In our experiments, Rb atoms released from a magneto-optic trap (MOT) fall under gravity until they are reflected, after which they are recaptured in the MOT. Multiple bounces of these atoms have been studied for times up to 600 ms. © 1995 The American Physical Society.
  • Journal article
    IVANOV M, BITOUK D, RZAZEWSKI K, KOTOCHIGOVA Set al., 1995,

    CLASSICAL CHAOS AND ITS QUANTUM MEASURES IN RYDBERG STATES OF MULTIELECTRON ATOMS

    , PHYSICAL REVIEW A, Vol: 52, Pages: 149-156, ISSN: 1050-2947
  • Conference paper
    Steinbach J, Garraway BM, Knight PL, 1995,

    Attractor states in dissipative quantum optical systems

    , Bratislava, 3rd central-european workshop on quantum optics APR 28-MAY 01, 1995 BUDMERICE CASTLE, SLOVAKIA, Publisher: Slovak Academy Sciences Institute Physics, Pages: 289-302
  • Conference paper
    Garraway BM, Knight PL, 1995,

    Stochastic simulations of dissipation in quantum optics: Quantum superpositions

    , New York, international workshop on quantum communications and measurement JUL 10-16, 1994 NOTTINGHAM, ENGLAND, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 463-477
  • Conference paper
    MIYAKE Y, MARANGOS JP, SHIMOMURA K, BIRRER P, NAGAMINE Ket al., 1995,

    Laser resonant ionization of thermal hydrogen-like atoms produced by nuclear reactions

    , 7th International Symposium on Resonance Ionization Spectroscopy and Its Applications (RIS-94), Publisher: AIP PRESS, Pages: 215-218, ISSN: 0094-243X
  • Journal article
    RZAZEWSKI K, IVANOV M, PUMARES L, PLAJA L, ROSO Let al., 1995,

    RADIATING COHERENT ATOMIC WAVE-PACKETS

    , LASER PHYSICS, Vol: 5, Pages: 451-460, ISSN: 1054-660X

    Recent progress in the production and control of atomic wave packets calls for reexamination of the most fundamental quantum optical processes. We examined the evolution of the atomic wave packet resonantly driven by the monochromatic laser beam and the spontaneous emission from an extended atom. We stress the role of Doppler shifts in the dephasing of the atomic dipole. New effects of single-pulse photon echo, homogeneous Doppler modification of the emission line, and interference effects in the coherent part of the emission spectrum are discussed. We also present the emission spectra of an atom oscillating in a harmonic trap.
  • Journal article
    ZUO T, BANDRAUK A, IVANOV M, CORKUM Pet al., 1995,

    CONTROL OF HIGH-ORDER HARMONIC-GENERATION IN STRONG LASER FIELDS

    , PHYSICAL REVIEW A, Vol: 51, Pages: 3991-3998, ISSN: 1050-2947
  • Journal article
    SEIDEMAN T, IVANOV M, CORKUM P, 1995,

    ROLE OF ELECTRON LOCALIZATION IN INTENSE-FIELD MOLECULAR IONIZATION

    , PHYSICAL REVIEW LETTERS, Vol: 75, Pages: 2819-2822, ISSN: 0031-9007

    The rate of nonlinear ionization is strongly enhanced as a molecule is stretched beyond its equilibrium internuclear separation, reaching a peak rate that is many orders of magnitude greater than that at either small or large distances. The enhancement results from nonadiabatic electron localization near the nuclei and its presence is insensitive to the laser frequency and intensity. Most intense-field dissociative ionization experiments are influenced by this effect.
  • Journal article
    GARRAWAY BM, KNIGHT PL, STEINBACH J, 1995,

    DISSIPATION OF QUANTUM SUPERPOSITIONS - LOCALIZATION AND JUMPS

    , APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 60, Pages: S63-S68, ISSN: 0946-2171
  • Journal article
    CORKUM P, DUPONT E, IVANOV M, 1995,

    APPLICATIONS OF WEAK AND STRONG-FIELD COHERENT CONTROL

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 209, Pages: 84-PHYS, ISSN: 0065-7727
  • Journal article
    McDonald GS, New GHC, Losev LL, Lutsenko AP, Shaw MJet al., 1995,

    On the generation of ultrabroad bandwidth light for inertial confinement fusion

    , Laser Interaction with Matter, Pages: 85-88, ISSN: 0951-3248

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