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Exact chirped multi-soliton solutions of the nonlinear Schr(o|¨)dinger equation with varying coefficients

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Chinese optics Letters 2005年第3期3卷 136-139页

作者：郝瑞宇李录杨荣草李仲豪周国生 department of Electronics and Information Technology State Key Laboratory of Quantum optics and Quantum optics Devices The State Key Subject of optics department of Physics

In this letter, exact chirped multi-soliton solutions of the nonlinear Schrodinger (NLS) equation with varying coefficients are found. The explicit chirped one- and two-soliton solutions are generated. As an example, an exponential distributed control system is considered, and some main features of solutions are shown. The results reveal that chirped soliton can all be nonlinearly compressed cleanly and efficiently in an optical fiber with no loss or gain, with the loss, or with the gain. Furthermore, under the same initial condition, compression of optical soliton in the optical fiber with the loss is the most dramatic. Also, under nonintegrable condition and finite initial perturbations, the evolution of chirped soliton has been demonstrated by simulating numerically.

关键词： Exact chirped multi-soliton solutions of the nonlinear Schr dinger equation with varying coefficients

High contrast atomic magnetometer based on coherent population trapping

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Chinese Physics B 2014年第2期23卷 477-480页

作者：杨爱林杨国卿徐云飞林强 Institute of optics Department of PhysicsZhejiang University

We present an experimental and theoretical investigation of the coherent population trapping （CPT） resonance excited on the D1 line of 87Rb atoms by bichromatic linearly polarized laser light. The experimental results show that a lin｜｜lin tran- sition scheme is a promising alternative to the conventional circular-circular transition scheme for an atomic magnetometer. Compared with the circular light transition scheme, linear light accounts for high-contrast transmission resonances, which makes this excitation scheme promising for high-sensitivity magnetometers. We also use linear light and circular light to detect changes of a standard magnetic field, separately.

关键词： high contrast atomic magnetometer coherent population trapping

Exact Evolution of Ultrashort Hollow-Airy Pulses in the Spatiotemporal Domain

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Chinese Physics Letters 2015年第1期32卷 47-51页

作者：张敬芳王兆英林强 Institute of optics Department of PhysicsZhejiang University

An exact analytic expression for an ultrashort hollow-Airy wave packet is presented beyond the slowly varying envelope approximation. The hollow-Airy wave packet combines the hollow-Gaussian beam in the spatial domain and the Airy pulse in the temporal domain. The spatiotemporal propagation dynamics of the ultrashort hollow- Airy pulse are analyzed by the numerical simulations. During the propagation in free space, the spatial intensity profile evolves from hollow-Gaussian to Gaussian shape; the temporal intensity profile retains Airy shape over several Rayleigh ranges. The acceleration property of the ultrashort Airy pulse is also demonstrated.

关键词： Exact Evolution of Ultrashort Hollow-Airy Pulses in the Spatiotemporal Domain cycle

Left-Handed Properties in Two-Dimensional Photonic Crystals Formed by Holographic Lithography

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Chinese Physics Letters 2008年第11期25卷 3972-3975页

作者：沈晓霞杨修伦蔡履中王玉荣董国艳孟祥锋徐先锋 department of optics Shandong University Jinan 250100

We give an analysis of the frequency distribution trends in the four lowest bands of two-dimensional square lattices formed by holographic lithography （HL） and in the lattices of the same kind but with regular dielectric columns with increasing filling ratios, and then present a comparative study on the left-handed properties in these two kinds of structures using plane wave expansion method and finite-difference time-domain （FDTD） simulations. The results show that the left-handed properties are more likely to exist in structures with large high-epsilon filling ratios or in a connected lattice.

关键词： the power-law exponents precipitation durative abrupt precipitation change

A laser pump-re-pump atomic magnetometer

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Chinese Physics B 2013年第12期22卷 177-181页

作者：杨爱林杨国卿蔡勋明徐云飞林强 Institute of optics Department of Physics Zhejiang University

We demonstrate experimentally an atomic magnetometer based on optical pumping theory, a magnetic resonance that is induced by a radio frequency field and dependent on the magnetic field strength. Compared with the conventional method using one radiation field, which is used not only as the probe beam but also as a pump beam, the additional re-pump beam can increase remarkably the amplitude of the signal. It is shown that the amplitude of the magnetic field resonance signal can increase more than 55% by using an additional re-pump beam, which makes the sensitivity of the magnetometer higher. Finally, we investigate the relation between amplitude of the signal and re-pump laser power, and calculate the atomic population in the trapping states with rate equations.

关键词： atomic magnetometer optical pumping sensitivity

Generation of four-atom Greenberger-Horn-Zeilinger state via adiabatic passage

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Chinese Physics B 2013年第5期22卷 141-146页

作者：张春玲陈美锋 Laboratory of Quantum optics Department of PhysicsFuzhou University

We propose a scheme to generate a Greenberger-Horn-Zeilinger （GHZ） state of four atoms trapped in a two-mode optical cavity via an adiabatic passage. The scheme is robust against moderate fluctuations of the experimental parameters. Numerical calculations show that the excited probabilities of both the cavity modes and the atoms are tiny and depend on the pulse peaks of the classical laser fields. For certain decoherence due to the atomic spontaneous emission and the cavity decay, there exits a range of pulse peaks to get a high fidelity.

关键词： Greenberger-Horn-Zeilinger (GHZ) state adiabatic passage cavity quantum electrodynamics

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ONE FIRE-BALL

Chinese Physics Letters 1989年第4期6卷 153-156页

作者： WANG Zhengzhi department of optics Shandong UniversityJinan

In the case of k=1,√s≥√s0=1.847×10^(8)×(1±0.397)GeV and at the constant temperature and volume,the average particle number in each fire-ball n and the rapidity y can be related to the following equation 1/n dn/dy=1/ch^(2)y ζ(3)/F(Mc^(2)/k_(B)T)exp(-Mc^(2)/k_(B)Tchy)[1+Mc^(2)/k_(B)Tchy+1/2(Mc^(2)/k_(B)Tchy)^(2)]and in the inelastic case where √s≥√s0,the cross section σin〜constant.

关键词： constant equation particle

Investigation of the thermal adaptability for a mobile cold atom gravimeter

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Chinese Physics B 2016年第12期25卷 241-246页

作者：王启宇王兆英付志杰林强 Institute of optics Department of PhysicsZhejiang University Center for optics and Optoelectronics Research College of ScienceZhejiang University of Technology

The cold atom gravimeter offers the prospect of a new generation of inertial sensors for field applications. We ac- complish a mobile atom gravimeter. With the compact and stable system, a sensitivity of 1.4× 10-7 ***-1/2 is achieved. Moreover, a continuous gravity monitoring of 80 h is carried out. However, the harsh outdoor environment is a big challenge for the atom gravimeter when it is for field applications. In this paper, we present the preliminary investigation of the thermal adaptability for our mobile cold atom gravimeter. Here, we focus on the influence of the air temperature on the performance of the atom gravimeter. The responses to different factors （such as laser power, fiber coupling efficiency, etc.） are evaluated when there is a great temperature shift of 10 ℃. The result is that the performances of all the factors deteriorate to different extent, nevertheless, they can easily recover as the temperature comes back. Finally, we conclude that the variation of air temperature induces the increase of noise and the system error of the atom gravimeter as well, while the process is reversible with the recovery of the temperature.

关键词： atom gravimeter the environmental adaptability atom intefferometer

Transverse Zeeman background correction method for air mercury measurement

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Chinese Physics B 2014年第10期23卷 458-463页

作者：李传新司福祺刘文清周海金江宇胡仁志 department of optics and Optical Engineering University of Science and Technology of China Key Laboratory of Environmental optics and Technology. Anhui Institute of optics and Fine Mechanics Chinese Academy of Sciences

By utilizing a natural mercury lamp, the transverse Zeeman background correction method, which is used for trace mercury measurement in air, is studied. In this paper, a natural mercury lamp is used as a light source, and is placed in a 1.78-T magnetic field. The lamp emits two linearly polarized light beams σ± and π of 253.65-nm resonance line, which are used as bias light and absorbing light, respectively. A polarization modulation system is used to allow σ± and π light beams to pass through alternately with a certain frequency. A multipath optical cell with 12-m optical path is used to increase optical distance. Based on the system described above, the influence caused by UV absorbing gases, such as NO2, SO2, acetone, benzene, and O3, is analyzed. The results show that it may reduce the detection limit when the concentrations of these gases exceed 83.4 ppm, 20.3 ppm, 142.3 ppm, 0.85 ppm, and 0.55 ppm, respectively. The detection limit of the system is calculated and can achieve up to 1.44 ng/m3 in 10 minutes. Measurements on mercury sample gas and air are carded out, and the measured data are compared with the data of RA-915 mercury analyzer （Russia）. The result shows that the correlation coefficient reaches up to 0.967. The experimental results indicate that the transverse Zeeman background correction method can be used to quantify trace mercury in air with high-precision.

关键词： transverse Zeeman background correction natural mercury lamp magnetic field multipath opticalcell