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  • Journal article
    Protopapas M, Lappas DG, Keitel CH, Knight PLet al., 1996,

    Recollisions, bremsstrahlung, and attosecond pulses from intense laser fields

    , PHYSICAL REVIEW A, Vol: 53, Pages: R2933-R2936, ISSN: 2469-9926
  • Journal article
    Ciarrocca M, Marangos JP, Burgess DD, Burnett Ket al., 1996,

    Spectral shifting by optical and collisional ionization of an intense laser pulse in dense noble gases

    , JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 13, Pages: 794-804, ISSN: 0740-3224
  • Journal article
    Enright GD, Morton JR, Passmore J, Preston KF, Thompson RC, Wood DJet al., 1996,

    The novel magnetic properties of SSSNCCNSSS(M)(2) (M=AsF6, Sb2F11) and the electronic properties of (SSSNCCNSSS+center dot)-S-center dot+

    , CHEMICAL COMMUNICATIONS, Pages: 967-968, ISSN: 1359-7345
  • Journal article
    Rippin MA, Knight PL, 1996,

    Modified spontaneous emission in cylindrical microcavities: Waveguiding and distributed Bragg reflecting structures

    , JOURNAL OF MODERN OPTICS, Vol: 43, Pages: 807-853, ISSN: 0950-0340
  • Journal article
    Hinds EA, Sandoghdar V, Sukenik CI, Haroche Set al., 1996,

    Spectroscopy of atoms confined to the single node of a standing wave in a parallel-plate cavity

    , Physical Review A, ISSN: 1050-2947
  • Journal article
    Garraway BM, Knight PL, 1996,

    The localization and survival of cats in a Kerr medium

    , OPTICS COMMUNICATIONS, Vol: 123, Pages: 517-522, ISSN: 0030-4018
  • Journal article
    Power WL, Knight PL, 1996,

    Stochastic simulations of the quantum Zeno effect

    , PHYSICAL REVIEW A, Vol: 53, Pages: 1052-1059, ISSN: 1050-2947
  • Journal article
    ChavezCerda S, McDonald GS, New GHC, 1996,

    Nondiffracting beams: Travelling, standing, rotating and spiral waves

    , OPTICS COMMUNICATIONS, Vol: 123, Pages: 225-233, ISSN: 0030-4018
  • Journal article
    Plenio MB, Knight PL, Thompson RC, 1996,

    Inhibition of spontaneous decay by continuous measurements. Proposal for realizable experiment

    , OPTICS COMMUNICATIONS, Vol: 123, Pages: 278-286, ISSN: 0030-4018
  • Conference paper
    Horvath GZK, Dholakia K, Hernandez-Pozos JL, Rink J, Segal DM, Thompson RCet al., 1996,

    Theoretical calculation and experimental measurement of an `avoided crossing' in the combined ion trap

    Calculation of the oscillation frequencies of ions confined in a trap, which combines the static and magnetic fields of a Penning trap with the oscillating electric field of a radiofrequency trap, takes into account a possible misalignment of the magnetic field direction with respect to trap symmetry axis. The resulting ion oscillation frequencies are similar to those of a perfect trap, except that there is an `avoided crossing' near the point where the axial and upper radial frequency would degenerate without misalignment. The measured frequencies and the variation of the gap magnitude with angle is in agreement with the theoretical model and can form the basis for aligning a combined or Penning trap accurately with external magnetic field.
  • Conference paper
    Berkeland DJ, Hinds EA, Boshier MG, 1996,

    Precise laser spectroscopy of hydrogen and singly-ionized helium

    , Pages: 172-173, ISSN: 0589-1485

    We have measured the hydrogen 1S Lamb shift to be 8,172,827(51) kHz, the most precise value for any Lamb shift. The result is in reasonable agreement with the predictions of quantum electrodynamics (QED), although its interpretation as a test of QED is limited by the uncertainty in the proton charge radius. A measurement of the He<sup>+</sup>(2S) Lamb shift by laser spectroscopy can bypass this limitation and investigate a nine standard deviation discrepancy between theory and experiment for this Lamb shift.
  • Journal article
    Ritsataki A, French PMW, New GHC, 1996,

    Numerical model of Kerr-lens mode-locking

    , Conference Proceedings Lasers and Electro Optics Society Annual Meeting LEOS, ISSN: 1092-8081

    In recent years, there has been a great deal of interest in Kerr-lens mode-locking (KLM) in view of its implications for femtosecond pulse generation in solid-state lasers. Simple criteria for determining the cavity parameters that maximize the nonlinear amplitude modulation and promote self-starting have been sought, with attention centered on the parameter δ defined as the relative change of beam size w with power P at one of the cavity mirrors (δ = ((1/w)∂w/∂P)<inf>P→0</inf>). Optimal KLM operation occurs when δ exhibits its most negative value. The aim of this work has been to develop a general numerical model to calculate values of δ in both the tangential and sagittal planes, taking into consideration astigmatism introduced by off-axis spherical mirrors and Brewster-angled surfaces, nonlinear coupling of the beam sizes between the two planes of polarization, self-focusing and gain-guiding. The way in which contour plots of δ(x, z) change with the introduction of each of the above effects into the model and the effect on the optimum region for KLM have been studied.
  • Conference paper
    Feng X, Hernandez-Pozos JL, Vincent J, Walker T, Segal DM, Thompson RCet al., 1996,

    Quantum effects in trapped beryllium ions

    Two experiments looking at the different aspects of the quantum theory of the interaction of radiation with atoms (ions) are reported. The first experiment investigates the quantum Zeno effect in which an atomic transition is `slowed down' by repeated measurements of the state of the system. The second experiment takes advantage of the unique properties of trapped ions to study cavity quantum electrodynamics (QED) effects, in particular, the modifications to the spontaneous emission of trapped ions held at the center of an optical cavity. The magnitude of the cavity's effect on the atomic emission increases with decreasing cavity mode volume so that small cavities and hence small traps are needed.
  • Journal article
    Petch JC, Keitel CH, Knight PL, Marangos JPet al., 1996,

    Role of electromagnetically induced transparency in resonant four-wave-mixing schemes

    , PHYSICAL REVIEW A, Vol: 53, Pages: 543-561, ISSN: 1050-2947
  • Conference paper
    Keitel CH, Watson JB, Knight PL, Burnett Ket al., 1996,

    Quantum signatures in strong field physics

    , New York, 7th rochester conference on coherence and quantum optics JUN 07-10, 1995 ROCHESTER, NY, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 535-537
  • Conference paper
    Vitanov NV, Knight PL, 1996,

    Coherent excitation of two-level atoms by pulse trains

    , New York, 7th rochester conference on coherence and quantum optics JUN 07-10, 1995 ROCHESTER, NY, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 521-522
  • Conference paper
    Sanpera A, Protopapas M, Watson JB, Burnett K, Knight PLet al., 1996,

    High harmonic generation efficiency

    , New York, 9th international symposium on ultrafast processes in spectroscopy (ups 95) OCT 30-NOV 03, 1995 TRIESTE, ITALY, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 295-298
  • Conference paper
    Knight PL, Keitel CH, Burnett K, Watson JBet al., 1996,

    High harmonic generation as a recollision process

    , New York, 9th international symposium on ultrafast processes in spectroscopy (ups 95) OCT 30-NOV 03, 1995 TRIESTE, ITALY, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 305-309
  • Conference paper
    Dalton BJ, Guerra ES, Knight PL, 1996,

    Input-output from optical cavities: Quasi-mode theory

    , New York, 7th rochester conference on coherence and quantum optics JUN 07-10, 1995 ROCHESTER, NY, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 577-578
  • Conference paper
    Knight PL, Garraway BM, 1996,

    Quantum superpositions in dissipative environments: Decoherence and deconstruction

    , 44th Scottish Universities Summer School in Physics - Quantum Dynamics of Simple Systems, Publisher: IOP PUBLISHING LTD, Pages: 199-238
  • Journal article
    Fraser DJ, Hutchinson MHR, Marangos JP, Shao YL, Tisch JWG, Castillejo Met al., 1995,

    High harmonic generation in butane and butadiene

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 28, Pages: L739-L745, ISSN: 0953-4075
  • Journal article
    AVERBUKH V, MOISEYEV N, MIRBACH B, KORSCH HJet al., 1995,

    DYNAMICAL TUNNELING THROUGH A CHAOTIC REGION - A CONTINUOUSLY DRIVEN RIGID ROTOR

    , ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, Vol: 35, Pages: 247-256, ISSN: 0178-7683
  • Journal article
    VITANOV NV, KNIGHT PL, 1995,

    CONTROL OF ATOMIC TRANSITIONS BY THE SYMMETRY OF EXCITATION PULSES

    , OPTICS COMMUNICATIONS, Vol: 121, Pages: 31-35, ISSN: 0030-4018
  • Journal article
    WATSON JB, KEITEL CH, KNIGHT PL, BURNETT Ket al., 1995,

    Quantum signatures in the stabilization dynamics

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 52, Pages: 4023-4028, ISSN: 1050-2947

    We investigate the phase-space dynamics of a hydrogenic atom in a very intense, high-frequency laser field, by comparing the time-dependent quantum Wigner functions with the corresponding classical distributions calculated using the Monte Carlo method. In both cases we model the atom by a one-dimensional soft-core potential in order to simplify the calculation. We demonstrate the importance of nonclassical interferences in the Wigner function and show how negative parts of it observed at the peak of the pulse are associated with the formation of a coherent superposition of dressed ‘‘Kramers-Henneberger’’ (KH) eigenstates. These signatures of the quantum dynamics are eliminated towards the end of the pulse when the coherence between the KH eigenstates degrades so that the classical and the quantum mechanical phase-space distributions come into agreement.
  • Journal article
    Knight PL, 1995,

    Rudolf Peierls (1907-1995) - Obituary

    , CONTEMPORARY PHYSICS, Vol: 36, Pages: 375-375, ISSN: 0010-7514
  • Journal article
    PROTOPAPAS M, KNIGHT PL, 1995,

    PHASE-CONTROL IN 2-COLOR MULTIPHOTON IONIZATION

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 28, Pages: 4459-4479, ISSN: 0953-4075
  • Journal article
    VIVIRITO RMA, KNIGHT PL, 1995,

    ADIABATIC EXCITATION AND STABILIZATION IN SHORT-RANGE POTENTIALS

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 28, Pages: 4357-4375, ISSN: 0953-4075
  • Journal article
    PROTOPAPAS M, SANPERA A, KNIGHT PL, BURNETT Ket al., 1995,

    High-intensity two-color interactions in the tunneling and stabilization regimes

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 52, Pages: R2527-R2530, ISSN: 1050-2947

    Two-color excitation of a hydrogen atom has been studied by solving the time-dependent Schrödinger equation. We have chosen the two laser frequencies to be the fundamental and its third harmonic with an adjustable phase between the two laser fields. This has been proposed and successfully implemented in the past for "coherent control" of atomic and chemical processes. Here we have extended the study to the high-intensity domain and well into the tunneling and the stabilization regimes. We show that in the tunneling regime the two-color excitation can enhance the intensity of harmonics by more than two orders of magnitude compared to a single color at the same effective intensity. In the stabilization regime we confirm that two-color excitation can be used to generate higher harmonics.
  • Journal article
    Hinds EA, Berkelend DJ, Boshier MG, 1995,

    Precise Optical Measurement of Lamb Shifts in Atomic Hydrogen

    , Physical Review Letters, ISSN: 0031-9007
  • Journal article
    NEW GHC, WILSON DC, 1995,

    SIMULATIONS OF RAMAN CONVERSION IN LARGE-APERTURE AMPLIFIERS

    , OPTICS COMMUNICATIONS, Vol: 119, Pages: 673-681, ISSN: 0030-4018

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