Search or filter publications

Filter by type:

Filter by publication type

Filter by year:

to

Results

  • Showing results for:
  • Reset all filters

Search results

  • Journal article
    GAUTHEY FI, KEITEL CH, KNIGHT PL, MAQUET Aet al., 1995,

    Role of initial coherence in the generation of harmonics and sidebands from a strongly driven two-level atom

    , PHYSICAL REVIEW A, Vol: 52, Pages: 525-540, ISSN: 1050-2947

    We investigate the coherent and incoherent contributions of the scattering spectrum of strongly driven two-level atoms as a function of the initial preparation of the atomic system. The initial ‘‘phasing’’ of the coherent superposition of the excited and ground states is shown to influence strongly the generation of both harmonics and hyper-Raman lines. In particular, we point out conditions under which harmonic generation can be inhibited at the expense of the hyper-Raman lines. Our numerical findings are supported by approximate analytical evaluation in the dressed state picture.
  • Journal article
    GARRAWAY BM, KIM MS, KNIGHT PL, 1995,

    QUANTUM JUMPS, ATOMIC SHELVING AND MONTE-CARLO FLUORESCENCE-SPECTRA

    , OPTICS COMMUNICATIONS, Vol: 117, Pages: 560-569, ISSN: 0030-4018
    • Cite
    • Citations: 25
  • 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
    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
  • Conference paper
    ABEL KH, SCHILK AJ, BROWN DP, KNOPF MA, THOMPSON RC, PERKINS RWet al., 1995,

    CHARACTERIZATION AND CALIBRATION OF A LARGE-AREA BETA-SCINTILLATION DETECTOR FOR DETERMINATION OF SR-90

    , 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III), Publisher: AKADEMIAI KIADO, Pages: 99-106, ISSN: 0236-5731
  • 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
    • Cite
    • Citations: 29
  • Conference paper
    SCHILK AJ, ABEL KH, BROWN DP, THOMPSON RC, KNOPF MA, HUBBARD CWet al., 1995,

    SELECTIVE, HIGH-ENERGY BETA-SCINTILLATION SENSOR FOR REAL-TIME, IN-SITU CHARACTERIZATION OF U-238 AND SR-90

    , 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III), Publisher: AKADEMIAI KIADO, Pages: 107-111, ISSN: 0236-5731
  • 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: 2469-9926
  • 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
    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
    OTIENO T, RETTIG SJ, THOMPSON RC, TROTTER Jet al., 1995,

    PYRIDAZINE COMPLEXES OF COPPER(II) NITRATE - SYNTHESIS AND STRUCTURAL AND MAGNETIC STUDIES

    , INORGANIC CHEMISTRY, Vol: 34, Pages: 1718-1725, ISSN: 0020-1669
  • 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
    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
    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
  • Conference paper
    HERBST JD, RECH B, THELEN RF, THOMPSON RCet al., 1995,

    STATUS OF THE 9-MJ RANGE GUN SYSTEM

    , 7th Symposium on Electromagnetic Launch Technology, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 540-545, ISSN: 0018-9464
  • Journal article
    RUDOLPH T, FICEK Z, DALTON B, 1995,

    2-ATOM RESONANCE FLUORESCENCE IN RUNNING-WAVE AND STANDING-WAVE LASER FIELDS

    , Vol: 52, Pages: 636-656
  • 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
  • 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
    Rink J, Dholakia K, Horvath GZK, Hernandez-Pozos JL, Power W, Segal DM, Thompson RC, Walker Tet al., 1995,

    A study of trapped ion dynamics by photon-correlation and pulse-probe techniques

    , Non-Neutral Plasma Physics Ii, Pages: 162-170, ISSN: 0094-243X
  • Conference paper
    THOMPSON RC, 1995,

    PERSONAL RECOLLECTIONS OF RADIATION BIOLOGY RESEARCH AT HANFORD

    , Symposium on Radiobiology and Dosimetry of Inhaled Radionuclides, Publisher: NUCLEAR TECHNOLOGY PUBL, Pages: 275-278, ISSN: 0144-8420
  • 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
  • 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
    SCHILK AJ, KNOPF MA, THOMPSON RC, HUBBARD CW, ABEL KH, EDWARDS DR, ABRAHAM JRet al., 1994,

    REAL-TIME, IN-SITU DETECTION OF SR-90 AND U-238 IN SOILS VIA SCINTILLATING-FIBER-SENSOR TECHNOLOGY

    , 8th Symposium on Radiation Measurements and Applications, Publisher: ELSEVIER SCIENCE BV, Pages: 477-481, ISSN: 0168-9002
  • Conference paper
    Sauer BE, Hinds EA, Wang J, 1994,

    YbF - a new way to measure the electron electric dipole moment

    Heavy diatomic <sup>2</sup>Σ or <sup>2</sup>Π molecules were considered to be spectaculary sensitive systems to search for a permanent electric dipole moment (EDM) of the electron. To devise a molecular beam experiment using this kind of molecule, a variety of candidate molecules were considered. The YbF compound was chosen at the molecular beam and the production and detection methods for the molecules were studied. Several chemical mixtures were utilized to measure YbF production efficiency. Using both the hot wire and laser induced fluorescence, YbF was detected. Narrow linewidth of the crossed laser molecular beam apparatus was utilized to determine the spin-rotation and hyperfine splitting constants of the YbF molecule.

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://www.imperial.ac.uk:80/respub/WEB-INF/jsp/search-t4-html.jsp Request URI: /respub/WEB-INF/jsp/search-t4-html.jsp Query String: id=213&limit=30&resgrpMemberPubs=true&resgrpMemberPubs=true&page=64&respub-action=search.html Current Millis: 1770843000667 Current Time: Wed Feb 11 20:50:00 GMT 2026