Journals >Chinese Journal of Quantum Electronics
Contents
2004
Volume: 21 Issue 1
24 Article(s)
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Research Article
Progress of the Research on Quantum Control in Experiment
[in Chinese], and [in Chinese]
Quantum control theory is a new interdiscipline, which mainly studies the control of quantum state for systems in the microworld. This theory is obviously different from the classical control theory, and currently, the method through experiments is the most direct and effective method for research of quantum control. IQuantum control theory is a new interdiscipline, which mainly studies the control of quantum state for systems in the microworld. This theory is obviously different from the classical control theory, and currently, the method through experiments is the most direct and effective method for research of quantum control. In this paper, the current research state of quantum control in experiment is systemically introduced, and the future of the research is also prospected..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 1 (2004)
Equivalent Formula and Approximate Formulas of the Angular Spectrum Representation
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
n this paper, the equivalence of the angular-spectrum representation and the first Rayleigh-Sommerfeld diffraction formula is demonstrated simply by coordinate transformation and the approximate formulas-Fresnel-Kirchoff diffraction, Fresnel diffraction, Fraunhofer diffraction are derived directly from the angular-specn this paper, the equivalence of the angular-spectrum representation and the first Rayleigh-Sommerfeld diffraction formula is demonstrated simply by coordinate transformation and the approximate formulas-Fresnel-Kirchoff diffraction, Fresnel diffraction, Fraunhofer diffraction are derived directly from the angular-spectrum representation..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 7 (2004)
Collisional Energy Transfer for Cs(8D)+K(4S) in Cs-K Vapor Mixture
[in Chinese], and [in Chinese]
Using two steps excitation of the cesium 8D atomic level in a cesium-potassium vapor mixture, we observed the reverse heteronuclear energy-pooling collision Cs(8D)+K(4S) →Cs(5D)+K(4P) at thermal energy. A double-modulation technique has been used to select the fluorescence contributions at the K(4PJ) exit channels due Using two steps excitation of the cesium 8D atomic level in a cesium-potassium vapor mixture, we observed the reverse heteronuclear energy-pooling collision Cs(8D)+K(4S) →Cs(5D)+K(4P) at thermal energy. A double-modulation technique has been used to select the fluorescence contributions at the K(4PJ) exit channels due only to the above reactions. The ground state potassium atom density was measured by the absorption of line from a K hollow-cathode lamp. The measured density and fluorescence intensities have been used to obtain reverse energy-pooling rate coefficients. The contribution to the rate coefficients from other processes is discussed..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 11 (2004)
LD-pumped Actively Electro-optic Q-switching Lasers With Pulse Repetition Rates up to 5 kHz
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The characteristic of a continuous-wave (CW) laser diode (LD) end-pumped Nd:YVO crstal electro-optic Q-swtiching with pulse repetition rate from 20 to 5000 Hz laser is presented in this paper. With 25 A (about 10 W) of the incident pump laser, 1 kHz of pulse repetition rates, Q-switching 1064 nm laser with average poweThe characteristic of a continuous-wave (CW) laser diode (LD) end-pumped Nd:YVO crstal electro-optic Q-swtiching with pulse repetition rate from 20 to 5000 Hz laser is presented in this paper. With 25 A (about 10 W) of the incident pump laser, 1 kHz of pulse repetition rates, Q-switching 1064 nm laser with average power of 160 mW, pulse width of 20 ns is obtained. The experimental results are analyzed and discussed..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 15 (2004)
Spectral and Luminescence Properties of(Yb0.05Y0.95)3Al5O12Crystal Grown by TGT
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The absorption spectra, luminescence spectra and fluorescence lifetime of Yb:YAG crystal grown by TGT were measured and the effect of annealing at oxidation and reduction atmosphere was studied. The absorption cross sections of main spectra 938 nm and 967 nm are 0.74×10-20cm2 and 0.36×10-20cm2. Yb2+ ions wereThe absorption spectra, luminescence spectra and fluorescence lifetime of Yb:YAG crystal grown by TGT were measured and the effect of annealing at oxidation and reduction atmosphere was studied. The absorption cross sections of main spectra 938 nm and 967 nm are 0.74×10-20cm2 and 0.36×10-20cm2. Yb2+ ions were not found in the Yb:YAG crystal by analysis of spectra. Different UV absorption spectra near the fringe of as-grown crystal were found..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 18 (2004)
Design of Current-stabilized Xenon-lamp Simmer Circuit
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper introduces a current-stabilized xenon-lamp simmer circuit. The circuit is very suitable to long pulse(ten to one hundred milliseconds) laser. We make a feedback to the PWM in order to stabilize the simmer current. The circuit is used to simmer different parameter xenon lamps.This paper introduces a current-stabilized xenon-lamp simmer circuit. The circuit is very suitable to long pulse(ten to one hundred milliseconds) laser. We make a feedback to the PWM in order to stabilize the simmer current. The circuit is used to simmer different parameter xenon lamps..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 23 (2004)
Study on Construction of Quantum Full-summator
[in Chinese], and [in Chinese]
In this paper the construction of low-qubit quantum full-summator by using Toffoli gate, CNOT gate, etc. is studied and it's transformation operation is analyzed. By comparison the rule about construction of multi-qubit quantum full-summator is obtained.In this paper the construction of low-qubit quantum full-summator by using Toffoli gate, CNOT gate, etc. is studied and it's transformation operation is analyzed. By comparison the rule about construction of multi-qubit quantum full-summator is obtained..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 27 (2004)
Using Fluorescence Detection Scheme to Find the Magnetic Field Zero
[in Chinese], [in Chinese], and [in Chinese]
A fluorescence detection scheme is applied to find the zero point of the magnetic field in the experimental system. This method is useful in the experiment of cold atoms and atomic optics.A fluorescence detection scheme is applied to find the zero point of the magnetic field in the experimental system. This method is useful in the experiment of cold atoms and atomic optics..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 31 (2004)
Squeezing Properties of Measured Phase Operator in a New Kind of Nonlinear Coherent State
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The squeezing properties in a new kind of nonlinear coherent states are discussed via the measured phase operators introduced by Barnett and Pegg. The conditions of squeezing are found and the relations between the squeezing and the coherent parameters are shown by numerical calculation.The squeezing properties in a new kind of nonlinear coherent states are discussed via the measured phase operators introduced by Barnett and Pegg. The conditions of squeezing are found and the relations between the squeezing and the coherent parameters are shown by numerical calculation..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 35 (2004)
Controlling a Unified Chaotic System by Collocating the Lyapunov Exponents
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An approach, which forces a unified chaotic system to the expected point by analytically designing the controller to collocate the Lyapunov exponents, has been proposed. Because Lyapunov exponents of the controlled system are prophetic, the convergence rate can be controlled by changing the Lyapunov exponents. Result sAn approach, which forces a unified chaotic system to the expected point by analytically designing the controller to collocate the Lyapunov exponents, has been proposed. Because Lyapunov exponents of the controlled system are prophetic, the convergence rate can be controlled by changing the Lyapunov exponents. Result shows that the convergence of a controlled unified system is independent of the parameter..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 39 (2004)
Quantum Fluctuations of Mesoscopic Capacitance Coupled Circuit with Mutual Inductance
[in Chinese], and [in Chinese]
The quantum fluctuations of charges and currents of mesoscopic capacitance coupled circuit with mutual inductance are studied by using canonical transformation and unitary transformation. The results show that when the components of the circuit are given, especially when the value of L1 = L2 is very small, with the incThe quantum fluctuations of charges and currents of mesoscopic capacitance coupled circuit with mutual inductance are studied by using canonical transformation and unitary transformation. The results show that when the components of the circuit are given, especially when the value of L1 = L2 is very small, with the increasing of coupling extent, the quantum fluctuations of charges in one loop of circuit decrease obviously, while those charge of the other loop increase obviously..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 43 (2004)
Preparation and Properties of MgF2 Thin Film by Pulsed Laser Deposition
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
Optical thin films of MgF2 were successfully fabricated by pulsed laser deposition technique. The morphology and optical properties were investigated. The transmittance was 60%-80% in the visible light range, and more than 90% in the infrared range. The XPS showed the atom ratio of F: Mg in the obtained film was 1.9-2.Optical thin films of MgF2 were successfully fabricated by pulsed laser deposition technique. The morphology and optical properties were investigated. The transmittance was 60%-80% in the visible light range, and more than 90% in the infrared range. The XPS showed the atom ratio of F: Mg in the obtained film was 1.9-2.1, very close to the bulk material. The refractive index of MgF2 thin film was -1.39 resulted from K-K calculation, also close to the value of 1.38 of the bulk MgF2..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 48 (2004)
Optical Thin Film Optimization Design Using Adaptive Real-coded Genetic Algorithm
[in Chinese], [in Chinese], and [in Chinese]
A new approach for design of thin film multi-layer coatings based on adaptive real-coded genetic algorithm is proposed. The adaptive real-coded genetic algorithm to design coating is compared with the other optical coating design methods and conventional genetic algorithm. The result shows this method can evolve the deA new approach for design of thin film multi-layer coatings based on adaptive real-coded genetic algorithm is proposed. The adaptive real-coded genetic algorithm to design coating is compared with the other optical coating design methods and conventional genetic algorithm. The result shows this method can evolve the design of better performance under the same design requirements. Theoretical and practical examples have prove that the method is efficient and reliable..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 51 (2004)
Study on the Propagation Properties of Optical Gaussian Shaped Pulses in Optical Fibers
[in Chinese]
The influence of perturbation on the propagation properties of optical Gaussian-shaped pulses is investigated in optical fibers by means of variational method, and the evolution equations for the parameters of the optical Gaussian-shaped pulse are derived.The influence of perturbation on the propagation properties of optical Gaussian-shaped pulses is investigated in optical fibers by means of variational method, and the evolution equations for the parameters of the optical Gaussian-shaped pulse are derived..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 56 (2004)
钬(Ho:YAG)激光细光纤传输研究Ho:YAG Laser Thin Fiber Transmission System
[in Chinese], and [in Chinese]
In this paper, a method is introduced for Ho:YAG laser transmission in thin fiber. Effects and the best match method are studied about interface lens, facula, and divergent angle of Ho:YAG laser. The impact of heating of rod on system parameter is discussed, correction method has been proposed, and correction formula iIn this paper, a method is introduced for Ho:YAG laser transmission in thin fiber. Effects and the best match method are studied about interface lens, facula, and divergent angle of Ho:YAG laser. The impact of heating of rod on system parameter is discussed, correction method has been proposed, and correction formula is inferred. The experimental rasults are in accordance with the theory..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 60 (2004)
Study on Application of a Novel Optical Fiber Sensor
[in Chinese]
The technique of optical fiber sensor has been of great interest, as it has various advantages. In this paper a novel optical fiber sensor has been developed based on Michelson interference principle. Furthermore we describe a non-contact method for precision measurement of the surface tension on fluids by this sensor.The technique of optical fiber sensor has been of great interest, as it has various advantages. In this paper a novel optical fiber sensor has been developed based on Michelson interference principle. Furthermore we describe a non-contact method for precision measurement of the surface tension on fluids by this sensor. The experimental results are more precise than that of conventional method. The system is immune to environment perturbation, the configuration is simple and the resolution is high. The presented method overcomes the disadvantages of conventional method, improves measuring precision, and expands the range for application of optical fiber sensors..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 64 (2004)
Study on Different Splitting Ratio Characteristic of Wavelength-flattened Fused-taper Fiber Couplers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The asymmetrical fused-taper coupler is studied theoretically with weakly guiding and weakly coupling approximation in this paper, the analysis reveals that this kind of couplers have wavelength-flattened characteristics, and the degree of asymmetry can affect the splitting ratio directly. A wavelength-flattened coupleThe asymmetrical fused-taper coupler is studied theoretically with weakly guiding and weakly coupling approximation in this paper, the analysis reveals that this kind of couplers have wavelength-flattened characteristics, and the degree of asymmetry can affect the splitting ratio directly. A wavelength-flattened coupler with different splitting ratio can be obtained by controlling the diameter ratio of two coupled arms in the process of fabrication. With 50% splitting ratio, the theoretical results agree with the experimental data..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 68 (2004)
Effects of EDFA on the Capacity of Optical Communication System
[in Chinese], and [in Chinese]
The information capacities of optical communication system with erbium-doped fiber amplifier (EDFA) are studied. Ignoring fiber nonlinearities and dispersion, the expression of system information capacities with EDFA is derived using information entropy theory. It is shown that EDFA introduces information loss, and 4-1The information capacities of optical communication system with erbium-doped fiber amplifier (EDFA) are studied. Ignoring fiber nonlinearities and dispersion, the expression of system information capacities with EDFA is derived using information entropy theory. It is shown that EDFA introduces information loss, and 4-11 (bit/s/Hz) of information capacities is obtained..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 73 (2004)
Study of Energy Density and Dispersion Characteristics on a Tapered Planar Array Waveguide Grating
[in Chinese], and [in Chinese]
In this paper, based on the structure characteristic of array waveguide grat-ing(AWG), and the approximately arithmetic Bloch function, the structure mode of a planar array of taped waveguides is made. The radiation characteristics and simulation of AWG are calculated, energy density and dispersion characteristics on aIn this paper, based on the structure characteristic of array waveguide grat-ing(AWG), and the approximately arithmetic Bloch function, the structure mode of a planar array of taped waveguides is made. The radiation characteristics and simulation of AWG are calculated, energy density and dispersion characteristics on a tapered planar AWG are discussed. Numerical results demonstrate that the most radiation power is in the Brillouin center zone Ω, the relation between transmission coefficient Tm and diffraction angle a is obtained, and the calculation is in agreement with the simulation result..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 77 (2004)
Quantum Confinement Analysis of Nanostructure in oxidation of SiGe alloys
[in Chinese], [in Chinese], and [in Chinese]
We investigate the oxidation behavior of Si1-xGex alloys (x=0.05, 0.15, and 0.25). The thickness of nanolayers and property of nanoparticles in oxide films after oxidation in O2 (dry) atmosphere at different temperature and for various lengths of time are measured with the high precision ellipsometer, the Rutherford baWe investigate the oxidation behavior of Si1-xGex alloys (x=0.05, 0.15, and 0.25). The thickness of nanolayers and property of nanoparticles in oxide films after oxidation in O2 (dry) atmosphere at different temperature and for various lengths of time are measured with the high precision ellipsometer, the Rutherford backscattering spectrometry and high-resolution scanning transmission electron microscopy. It was found that rejection of Ge from oxide layer results in piling up Ge at the interface between the growing SiO2 and the remaining SiGe, which forms a nanometer Ge-rich layer. We find a nanometer cap layer over the oxide film after fast oxidation, in which there are many Ge nanoparticles. Some new peaks in PL spectra related to the nanolayer and various kinds of nanostructure are discovered. We provide a quantum confinement model to analyze the PL spectra and the mechanism of nanostructure of the oxide and Ge segregation..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 83 (2004)
Optical Properties of Aerosol Detected by Mobile Lidar System
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
The basic detection principle of the optical properties of aerosol by mobile lidar is given. The structure and parameter of AML-1 mobile lidar system are presented. And some typical results measured in Bejing and Hefei are analysed.The basic detection principle of the optical properties of aerosol by mobile lidar is given. The structure and parameter of AML-1 mobile lidar system are presented. And some typical results measured in Bejing and Hefei are analysed..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 88 (2004)
Effect of Atmospheric and Ground Condition on the Target-background Contrast
[in Chinese], [in Chinese], and [in Chinese]
The problem about target discretion is very important in many applications. In this paper, detailed research about the effects under some typical atmospheric and ground conditions on the target-background contrast at 0.43-0.75 μm computed by the software package-MODTRAN has been carried out. And the results are provideThe problem about target discretion is very important in many applications. In this paper, detailed research about the effects under some typical atmospheric and ground conditions on the target-background contrast at 0.43-0.75 μm computed by the software package-MODTRAN has been carried out. And the results are provided as following description: the numerical values of contrast present subtle variety according to the seasons shift, and it is easier to identify targets in winter than in summer;both the numerical values and the distribution with wavelength of contrast present alternation according to the atmospheric models;similarly, the aerosol models affect both the numerical values and the distribution with wavelength of contrast..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 92 (2004)
Measurement of Particulate Mass Concentrations and Atmospheric Visibility With an Optical Particle Counter
[in Chinese], [in Chinese], and [in Chinese]
Atmospheric aerosol number concentration, atmospheric visibility and particulate mass concentrations, such as PM10, PM2.5 and PM1.0, were detected by an optical particle counter (OPC), a visibility meter and ambient particulate monitors respectively at the same time in Beijing during the winter of 2001. According to thAtmospheric aerosol number concentration, atmospheric visibility and particulate mass concentrations, such as PM10, PM2.5 and PM1.0, were detected by an optical particle counter (OPC), a visibility meter and ambient particulate monitors respectively at the same time in Beijing during the winter of 2001. According to the analysis of multivariate linear regression for particulate mass concentration and visibility with atmospheric aerosol concentration, the empiric formulas are given for calculating the visibility, PM10, PM2.5 and PM1.0 from atmospheric aerosol number distribution measured by an OPC..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 98 (2004)
Studies on Extinction Efficiency Factor Properties of Aerosol Particle and the Fit of Size Distribution
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
In this paper, we calculate the extinction efficiency factor Qext of single spherical particle by using Mie scattering theory, and analyse its characteristics with the increasing of radius r. The relationship between extinction coefficient and laser wavelength is calculated for Junge model. For Deimendjian model the raIn this paper, we calculate the extinction efficiency factor Qext of single spherical particle by using Mie scattering theory, and analyse its characteristics with the increasing of radius r. The relationship between extinction coefficient and laser wavelength is calculated for Junge model. For Deimendjian model the ratios table of 5 lidar wavelengths extinction coefficients is calculated, and the size distribution can be fit according to the table..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2004
- Vol. 21, Issue 1, 103 (2004)
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