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Destructive and Constructive Interference of High-Order Harmonic Generation in Mixture of He and Ne Gases

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Chinese physics Letters 2010年第3期27卷 120-123页

作者：金成周效信赵松峰 College of physics and Electronic Engineering Northwest Normal University Lanzhou 730070

Using the single-atom induced dipole moment under strong field approximation as a source, we suggest a model to simulate the macroscopic high-order harmonic generation （HHG） from the mixed gases （He and Ne） interacting with intense infrared laser by solving the three-dimensional Maxwell＇s equation of the harmonic field. Regular destructive interference （DI） and constructive interference （CI） are observed in the macroscopic HHG spectra when the gas jet is put at a good phase-matching position. A semiclassical model of short and long electron trajectories is applied to interpret the DI and CI of HHG qualitatively.

关键词： atomic and molecular physics optics quantum optics and lasers

Dressed Four-Wave Mixing Spectroscopy Modified by Polarization Interference and Atom-Wall Collision in Micrometric Thin Cells

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Chinese physics Letters 2010年第4期27卷 118-121页

作者：李院院李莉白晋涛李昌彪张彦鹏侯洵 Institute of optics and Electronics Department of Physics Xi'an University of Arts and Science Xi'an 710065 Institute of Photonics and Photonic Technology Key Laboratory of Photoelectronic Technology of Shaanxi Province Northwest University Xi'an 710069 Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi'an Jiaotong University Xi'an 710049 State Key Laboratory of Transient optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068

Dressed four-wave mixing （DFWM） spectroscopy is investigated theoretically in some micrometric thin cells. It is found that DFWM spectra can be modified by polarization interference of atoms and transient effects induced by atom-wall collision. This modification can lead to width-narrowing of DFWM lines and facilitates to implement experiment of high resolution DFWM spectroscopy in a confined atomic system.

关键词： atomic and molecular physics optics quantum optics and lasers

Enhanced Spin Depolarization and Storage Time in a Rb Vapor

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Chinese physics Letters 2009年第11期26卷 111-113页

作者：齐越蓉高宏张首刚 National Time Service Center Chinese Academy of Sciences PO Box 18 Xi'an 710600 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi'an Jiaotong University Xi'an 710049

The experiment of measuring the spin depolarized time and light storage time in a Rb vapor under different conditions is performed. Typically, these measurements are accomplished in three different containers： atoms in a bare glass cell, atoms in a buffer gas cell, and atoms in a tetracontane （C4oH82） coating cell. The increasing depolarization and storage times are observed in both the buffer gas cell and the tetracontane coating cell. In the latter case, a storage time greater than 400μs is obtained.

关键词： atomic and molecular physics optics quantum optics and lasers

Adiabatic Fidelity of Coherent Atom-Heteronuclear Molecule Conversion

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Chinese physics Letters 2010年第3期27卷 21-24页

作者：耿振铎贾宁赵旭夏田雨景辉 Department of physics Henan Normal University Xinxiang 453007 State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062

We study the adiabatic dark-state evolutions in coherent creations of heteronuclear diatomic or triatomic molecules from an ultracold two-species atomic condensate. We find that, for different nonlinear systems, the relations between the adiabatic fidelities and the adiabatic parameters are in a universal power law but with quite different parameters.

关键词： atomic and molecular physics optics quantum optics and lasers

Generation of a Super Strong Attosecond Pulse from an atomic Superposition State Irradiated by a Shape-Optimized Short Pulse

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Chinese physics Letters 2009年第11期26卷 56-59页

作者：郭福明杨玉军金明星丁大军朱颀人 Institute of atomic and molecular physics Jilin University Changchun 130012

Using a linearly polarized, phase-stabilized 3-fs driving pulse of 800 nm central wavelength shape-optimized on its＇ascending edge by its an amplitude-reduced pulse irradiating on a superposition state of the helium atom, we demonstrate theoretically the generation of a super strong isolated 176-attosecond pulse in the spectral region of 93-124 eV. The unusually high intensity of this attosecond pulse is marked by the Rabi-like oscillations emerging in the time-dependent populations of the ground state and the continuum during the occurrence of the electron recombination, which is for the first time observed in this work.

关键词： atomic and molecular physics optics quantum optics and lasers

Enhancement of Continuous Variable Entanglement in Four-Wave Mixing due to atomic Memory Effects

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Chinese physics Letters 2010年第4期27卷 143-146页

作者：朱玉柱胡响明王飞李景艳 Department of physics Huazhong Normal University Wuhan 430079

We explore the effects of atomic memory on quantum correlations of two-mode light fields from four-wave mixing. A three-level atomic system in A configuration is considered, in which the atomic relaxation times are comparable to or longer than the cavity relaxation times and thus there exists the atomic memory. The quantum correlation spectrum in the output is calculated without the adiabatic elimination of atomic variables. It is shown that the continuous variable entanglement is enhanced over a wide range of the normalized detuning in the intermediate and bad cavity cases compared with the good cavity case. In some situations more significant enhancement occurs at sidebands.

关键词： atomic and molecular physics optics quantum optics and lasers

Coherent Population Trapping-Ramsey Interference in Cold Atoms

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Chinese physics Letters 2010年第11期27卷 51-54页

作者：陈曦杨国卿王谨詹明生 State Key Laboratory of Magnetic Resonance and atomic and molecular physics and Wuhan National Laboratory for Optoelectronics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 Center for Cold Atom physics Chinese Academy of Sciences Wuhan 430071 Graduate University Chinese Academy of Sciences Beijing 100049

We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields＇ method. The interference fringe with line width of 80 Hz is obtained. We propose a novel method to measure the cold atom number. The measurement is insensitive to the pump beam intensity, the single photon detuning and even the initial state population. We use this method to normalize the interference signal and to improve the signal-to-noise ratio significantly.

关键词： atomic and molecular physics optics quantum optics and lasers

Collision-Induced Coherence Effect on Coherent Population Transfer

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Chinese physics Letters 2009年第7期26卷 103-106页

作者：杨希华张君张惠芳阎晓娜 Department of physics Shanghai University Shanghai 200444

We investigate the effect of collision-induced coherence on coherent population transfer with the stimulated Raman adiabatic passage technique in a double A-type four-level system with a widely separated excited doublet. It is shown that when the two pulsed lasers with Rabi frequencies nearly comparable to the energy separation of the doublet are tuned to the particular frequency where the condition for quantum interference is satisfied, the very low transfer efficiency due to the nonadiabatic coupling between the two degenerate adiabatic states could be enhanced significantly with the increase of the collisional decay rates in a moderate range. The enhanced transfer efficiency results from the weakening of the nonadiabatic coupling between the two degenerate adiabatic states realized through collision-induced destructive quantum interference.

关键词： atomic and molecular physics optics quantum optics and lasers

The n-Qubit W State of Ground-State Atoms Using Cavity QED and Single Photon Detection

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Chinese physics Letters 2010年第3期27卷 33-36页

作者：潘长宁张俊香赵学辉 School of Science Hunan University of Technology Zhuzhou 412008 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-Electronics Shanxi University Taiyuan 030006

We present a simple scheme for the probabilistic generation of the $n$-qubit W state of three-level systems in cavity quantum electrodynamics. Once the W state is prepared, it will be insensitive to the spontaneous emission of atoms due to the fact that only the two degenerate ground states of the three-level atoms are involved. With time evolution of the system, the success probability and the experimental feasibility are also discussed.

关键词： atomic and molecular physics optics quantum optics and lasers