Journals >Chinese Journal of Quantum Electronics
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2018
Volume: 35 Issue 2
20 Article(s)
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[in Chinese]
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 1 (2018)
Fragmentation of H2 in 405 nm intense femtosecond laser field
Wei GUO, Zhiqiang CHANG, and Yuehua LI
The kinetic energy and angular distributions of H+ as a function of 405 nm femtosecond laser intensity are experimentally measured by using velocity map imaging technique. The reaction pathways of dissociation channels, H+2→H++H and H2+2→H++H+, are discussed. The former is due to the direct one-photon pathway via the 1The kinetic energy and angular distributions of H+ as a function of 405 nm femtosecond laser intensity are experimentally measured by using velocity map imaging technique. The reaction pathways of dissociation channels, H+2→H++H and H2+2→H++H+, are discussed. The former is due to the direct one-photon pathway via the 1ω crossing, and the latter stems from Coulomb explosion of H2+2. Ionization of H+2 to H2+2 starts from bond softening. The relative yield of fragment peak indicates that dissociation and ionization of H+2 are competitive. The lower laser intensity emphasizes the dissociation of H+2, and the higher laser intensity favors the ionization of H+2..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 129 (2018)
Rapid determination of single brown-rice kernels moisture content using near-infrared spectroscopy
Chunyang WANG, Yuhan MA, Shuang FAN, and Qing HUANG
A near-infrared spectroscopy (NIRS) model of single brown-rice kernels moisture content is established and optimized by applying different preprocessing treatment and variables selection methods. Results show that in the following three ranges, from 5292 cm－1 to 5616 cm－1, 7236 cm－1 to 7600 cm－1, 7884 cm－1 to 8208 cm－1A near-infrared spectroscopy (NIRS) model of single brown-rice kernels moisture content is established and optimized by applying different preprocessing treatment and variables selection methods. Results show that in the following three ranges, from 5292 cm－1 to 5616 cm－1, 7236 cm－1 to 7600 cm－1, 7884 cm－1 to 8208 cm－1, the predictive ability of single brown-rice kernels moisture content partial least squares (PLS) model established by standard normal variation spectral pretreatment is optimal. Its determination coefficient is 0.98 and prediction root mean square error is 1.01%. The multivariate linear regression model(MLR) of single brown-rice kernels moisture content at 5492.56, 7158.84, 8285.12 cm－1 has the least variables and better prediction ability, whose determination coefficient is 0.9661 and prediction root mean square error is 1.1137%. Results show that near infrared spectroscopy can be employed to determine single brown-rice kernels moisture content rapidly and accurately..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 136 (2018)
Reconstruction method of atmospheric polarization mode∞ shape based on Hough transform
Chuan WU, Zhiguo FAN, Chao XU, and Yan SONG
A reconstruction method of atmospheric polarization mode ∞ shape based on Hough transform is proposed. Based on the mathematical model of polarization angle, the proposed method obtain ∞ shape representation equation. Hough transform is used to solve the unknown parameters. Equation parameters are calculated from the pA reconstruction method of atmospheric polarization mode ∞ shape based on Hough transform is proposed. Based on the mathematical model of polarization angle, the proposed method obtain ∞ shape representation equation. Hough transform is used to solve the unknown parameters. Equation parameters are calculated from the polarization angle information, and ∞ shape is reconstructed. Experimental results show that the reconstruction accuracy of ∞ shape is better than 99%. The proposed method can reconstruct ∞ shape from the polarization mode efficiently, which provides a new idea for the subsequent polarized light navigation..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 142 (2018)
Image real-value encryption based on Logistic chaos
Yuan HONG, Ning XU, and Xinghua TU
An image real-value encryption algorithm based on Logistic chaos is proposed. The transmission of encrypted information is greatly simplified while ensuring the information security. The algorithm uses Logistic chaos control to generate phase template. Based on the nonlinearity and sensitivity to initial values of the An image real-value encryption algorithm based on Logistic chaos is proposed. The transmission of encrypted information is greatly simplified while ensuring the information security. The algorithm uses Logistic chaos control to generate phase template. Based on the nonlinearity and sensitivity to initial values of the chaotic system, the key space is increased while the key volume is reduced, and system complexity is increased. In the premise of original information being restored, the obtained real-value encryption matrix is saved as low-distortion gray-scale image, which facilitates the transmission of encrypted information conveniently among users. The algorithm is simulated with MATLAB, and results show that the proposed algorithm has good robustness against noise and shear. The keys are characterized by high sensitivity, which provides strong resistance for exhaustive attack..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 149 (2018)
Medical image fusion algorithm based on salient features coupling local extreme decomposition
Wei LIU, and Cunchen TANG
In view of the fact that the complementarily of functional and structural information is not strong in the multimodal medical image fusion method, which easily appears the phenomenon of edge distortion and contour blur, a medical image fusion scheme based on the salient features coupling local extreme value decompositiIn view of the fact that the complementarily of functional and structural information is not strong in the multimodal medical image fusion method, which easily appears the phenomenon of edge distortion and contour blur, a medical image fusion scheme based on the salient features coupling local extreme value decomposition is proposed. The local extremum is introduced to decompose the source image into a series of smoothing sub-images in different scales. Canny operator is used to obtain the edge weighted mapping to keep the structure information of source image. The color perception mapping is extracted by the context aware operator. The fusion criterion based on the edge and color saliency feature functions as the weighted mapping coefficients are defined respectively to get smooth and detail fusion image. A new image is reconstructed from the smooth and detail image. Experimental results show that in CT and MRI, CT and PET image fusion, the edges and contours obtained by the proposed method are clearer and richer in details compared with the current fusion algorithms. The proposed algorithm has good fusion quality which has certain application value in the fields of medicine, remote sensing and infrared detection..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 156 (2018)
Design of optical path control system for a lamp-pumped Nd:YAG four-wavelength laser cleaning machine
Gensheng ZHA, Xianguo MENG, Xiande JIA, Qiang GUO, and Yisong FAN
In order to meet the demand of multi-wavelength output in laser cleaning, an optical path control system which can realize four wavelengths laser output alternately in a laser cleaning machine is designed. Based on the nonlinear effect of BBO crystal, the motion parts in light path are switched through the main controlIn order to meet the demand of multi-wavelength output in laser cleaning, an optical path control system which can realize four wavelengths laser output alternately in a laser cleaning machine is designed. Based on the nonlinear effect of BBO crystal, the motion parts in light path are switched through the main controller program, and four-wavelength output is realized in the same optical path system. By using two sets of vibrating mirror system at the laser output terminal, scanning output of each wavelength laser beam is realized, which expands the use range of laser cleaning machine. Experiment results show that the designed optical control system is stable and reliable, simple and easy to be realized..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 165 (2018)
A zero-knowledge proof protocol based on quantum teleportation
Yongzhi CHEN, Xincan FAN, and Xiaojun WEN
As one of the foundational tools for constructing cryptographic protocols, zero-knowledge proof is widely applied in the field of information security. The classical zero-knowledge proof scheme is based on computational complexity theory in mathematics, and its security is seriously threatened with the continuous improAs one of the foundational tools for constructing cryptographic protocols, zero-knowledge proof is widely applied in the field of information security. The classical zero-knowledge proof scheme is based on computational complexity theory in mathematics, and its security is seriously threatened with the continuous improvement of computing power, especially the appearance of quantum computer etc. A zero-knowledge proof protocol is proposed based on quantum teleportation principle. The proposed protocol uses quantum physical characteristics to implement zero-knowledge proof. It has the unconditional security, and can defeat all kinds of possible quantum attacks..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 173 (2018)
Construction of locally equivalent maximum entangled states using Hadamard transform
Haiqing HUANG, and Guangwen HUO
In quantum entanglement, the evolution of states is a unitary evolution process, and local unitary transformation does not change the system entanglement properties. A local unitary transformation method is proposed based on Hadamard transform. The four particle maximum entangled states proposed by Yeo and Chua and sixIn quantum entanglement, the evolution of states is a unitary evolution process, and local unitary transformation does not change the system entanglement properties. A local unitary transformation method is proposed based on Hadamard transform. The four particle maximum entangled states proposed by Yeo and Chua and six particle entangled states proposed by Borras et al. are transformed into four and six particle entangled states in simple form with exactly the same entanglement properties, which provides a theoretical basis for the relization of preparation and application. These entangled states have simpler expressions and special entanglement properties, and they have a potential application prospects in quantum teleportation, quantum dense coding, quantum secure direct communication and so on..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 179 (2018)
Exact solution of quantum entanglement of two-mode field interacting withΛ-type three-level atom
Honglu CONG, Xuehua LIU, Yu′na ZHAO, Na YU, and Xuezao REN
Quantum entanglement of a two-mode coherent field interacting with a Λ-type three-level atom system is solved exactly without rotating wave approximation, and the influence of mean photon number and detuning on quantum entanglement evolution are discussed. Numerical results show that the quantum entanglement period incQuantum entanglement of a two-mode coherent field interacting with a Λ-type three-level atom system is solved exactly without rotating wave approximation, and the influence of mean photon number and detuning on quantum entanglement evolution are discussed. Numerical results show that the quantum entanglement period increases with the increasing of mean photon number. The quantum entanglement maximum decreases gradually with increasing of detuning, and the time reaching the maximum increases gradually. When the detuning is relative large, the quantum entanglement has better periodicity in a relatively short period. The small zigzag shaped oscillation of quantum entanglement evolution curve due to virtual photon effect is gradually enhanced with the increasing of mean photon number and detuning..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 184 (2018)
Band gap structure of two-dimensional new-type function photonic crystals
Xiaojing LIU, Siqi ZHANG, Yu LIANG, Jiping LIU, Ji MA, Hong LI, Xiangdong MENG, Yiheng WU, and Jingbin LU
The band gap structure of two-dimensional function photonic crystals is investigated with plane wave expansion method, and the refractive index of dielectric cylinder is space coordinate function. Band gap structure of TE and TM waves is analyzed numerically, and which is compared with two-dimensional conventional photThe band gap structure of two-dimensional function photonic crystals is investigated with plane wave expansion method, and the refractive index of dielectric cylinder is space coordinate function. Band gap structure of TE and TM waves is analyzed numerically, and which is compared with two-dimensional conventional photonic crystals (the medium columns refractive index are constants). Influences of medium column radius ra, function coefficient k and parameter b on band gap structure of two-dimensional function photonic crystals are investigated. Results show that the band gap adjustment of two-dimensional function photonic crystals can be realize by changing the values of ra, k and b. There are absolute band gaps and semi-Dirac points in two-dimensional function photonic crystals. Results provide a new theoretical basis for the design of optics devices..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 191 (2018)
Design and simulation of fourth-order Chua’s circuit based on current conveyors
Juan WANG, Yulong BAI, Chunmei CHEN, and Jikai DUAN
Aiming at the disadvantages that the typical Chua’s chaotic circuit has a small variation range of parameters and does not applicable to high frequency circuits, a method is used to design the fourth-order Chua’s chaotic circuit by using current conveyors. A fourth-order Chua’s circuit is realized by deforming the typiAiming at the disadvantages that the typical Chua’s chaotic circuit has a small variation range of parameters and does not applicable to high frequency circuits, a method is used to design the fourth-order Chua’s chaotic circuit by using current conveyors. A fourth-order Chua’s circuit is realized by deforming the typical Chua’s circuit, and the nonlinear resistor and simulated inductor in fourth-order Chua’s circuit are realized with current conveyors. The adjusting range of parameters is extended, and the work frequency and stability of the circuit are improved. A secure communication circuit is designed to encrypt the information signal. The circuit is simulated with PSPICE software, which proves the feasibility of proposed method..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 197 (2018)
Influence of Kerr dispersion and intrapulse Raman scattering on propagation characteristics of solitons
Junkun HUANG, and Shaowu ZHANG
Higher order nonlinear Schro ¨dinger equation including Kerr dispersion term, self-frequency shift (SFS) term caused by intrapulse Raman scattering is solved by variational method. Evolution equations of Gaussian pulse parameters with propagation distance under different parameters are derived. Constraint relationHigher order nonlinear Schro ¨dinger equation including Kerr dispersion term, self-frequency shift (SFS) term caused by intrapulse Raman scattering is solved by variational method. Evolution equations of Gaussian pulse parameters with propagation distance under different parameters are derived. Constraint relations between pulse width and amplitude, pulse width and chirp are obtained. Results show that the soliton center frequency does not change under the appropriate parameter setting and there’s no jitter. Under certain conditions, the self-frequency shift and Kerr dispersion effects cancel out each other, the pulses propagate stably in the form of breather within a certain distance..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 204 (2018)
Emission energy monitoring of atmospheric detection lidar
Yang DU, Dengxin HUA, Wenhui XIN, Tingyao HE, Yan CUI, and Yazhou PU
Variation of output laser pulse energy has great influence on the measured data of radar, so the output laser pulse energy must be measured accurately in real-time. Aiming at the problem that output laser pulse width is very narrow, and it is difficult to achieve high frequency acquisition circuit, a pulse energy monitVariation of output laser pulse energy has great influence on the measured data of radar, so the output laser pulse energy must be measured accurately in real-time. Aiming at the problem that output laser pulse width is very narrow, and it is difficult to achieve high frequency acquisition circuit, a pulse energy monitoring system is designed based on the peak sampling and holding circuit. In situ monitoring of simulated pulses with pulse width of about 10 ns and repetition rates of 20, 60, 100 Hz is carried out. Results show that the system can accurately detect laser emitting energy without any pulse missing. There is a good linear relationship between the system output voltage and measured laser pulse energy in lidar observation experiments, which provides a correction basis for lidar data inversion..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 209 (2018)
Millimeter wave radar ranging algorithm based on cross-correlation function
Jie CAO, and Feifei ZHU
The classical linear frequency modulation continuous wave(LFMCW) radar ranging method adopts FFT transform to carry out signal processing. Calculation amount increases significantly with the sampling point increasing, which makes the real-time of ranging system not so ideal. To solve this problem, the cross-correlationThe classical linear frequency modulation continuous wave(LFMCW) radar ranging method adopts FFT transform to carry out signal processing. Calculation amount increases significantly with the sampling point increasing, which makes the real-time of ranging system not so ideal. To solve this problem, the cross-correlation function ranging method is introduced. Using the characteristics that LFMCW radar signal frequency change is triangular and the echo delay is less than one cycle, the distance can be measured with only one cycle of cross-correlation operation. Combined with the measured value of the cross-correlation function ranging method, FFT transform is used for the partial sampling points of sampling information, and more accurate distance information can be measured quickly and efficiently. The simulation results of MATLAB show that the average ranging measurement error combing with cross-correlation function is reduced by 1.434 m and the average operation time is reduced by 0.5 s, which improves the real-time performance and accuracy of the ranging system..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 216 (2018)
Uniform light design of digital lithography illumination system based on 365 nm LED
Qingjiu LIANG, and Jinyun ZHOU
In digital lithography illumination system, 365 nm light emitting diode (LED) is designed by using fly’s-eye lens. The lens is arranged in a nearly hexagon array structure, which can basically cover the circular light. The nearly hexagon array can reduce the number of invalid lens compared with the traditional square sIn digital lithography illumination system, 365 nm light emitting diode (LED) is designed by using fly’s-eye lens. The lens is arranged in a nearly hexagon array structure, which can basically cover the circular light. The nearly hexagon array can reduce the number of invalid lens compared with the traditional square structure, and the lens can be more effectively used to develop uniform light efficiency. The illumination systems with nearly hexagon array and 9×9 square fly’s-eye lens array are simulated respectively by software, and their irradiance maps are compared. Results show that the illumination system with nearly hexagon array is more uniform. The illumination system designed with the nearly hexagon array is combined with digital micro mirror device(DMD) and lithographic lens, and a digital lithography experiment with 2 μm precision is carried out. It’s found that the image surface illumination is uniform and line is clear..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 225 (2018)
Trap distribution of polyimide at different temperatures
Zhicheng MENG, Yongwei SUN, Qingyun YUAN, Song WANG, and Lidong ZHOU
Under the conditions of vacuum and different temperatures, surface charging of polyimide materials is carried out by electron gun irradiation, and their surface potential decay characteristics with time are measured. Variation of conductivity with temperature is obtained, and the trap distribution of polyimide at diffeUnder the conditions of vacuum and different temperatures, surface charging of polyimide materials is carried out by electron gun irradiation, and their surface potential decay characteristics with time are measured. Variation of conductivity with temperature is obtained, and the trap distribution of polyimide at different temperatures is calculated combining with theory of isothermal surface potential decay. With the increasing of temperature, the number of shallow traps in polyimide increases gradually, and that of deep traps reduces gradually. The variation rule of shallow traps is proportional to the conductivity of polyimide, that is to say, the more the shallow traps are, the stronger the migration of carriers will be. Research results can provide a useful reference for the modification of anti-aging and anti-flashover of polyimide materials..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 230 (2018)
Influences of built-in electric field and hydrostatic pressure on optical properties of exciton in GaN quantum dots
Dongmei ZHENG, Boqi XIAO, Siyu HUANG, and Zongchi WANG
In the case of effective mass and dipole approximation, considering the built-in electric field(BEF) generated by spontaneous and piezoelectric polarization, strain caused by lattice mismatch and adjustment of material parameters by static pressure of external fluid, the effects of BEF and external hydrostatic pressureIn the case of effective mass and dipole approximation, considering the built-in electric field(BEF) generated by spontaneous and piezoelectric polarization, strain caused by lattice mismatch and adjustment of material parameters by static pressure of external fluid, the effects of BEF and external hydrostatic pressure on the absorption coefficient of exciton optical transition and linear optical refractive index variation in a strained wurtzite(WZ) GaN/AlxGa1－xN cylindrical quantum dot are investigated by using variation method and density matrix method. Results show that the absorption peak intensity of exciton optical transition and linear optical refractive index are reduced by built-in electric field. The absorption peak of optical transition and two peaks of linear optical refractive index move towards low energy direction, and red-shift occurs obviously. The higher the content of Al in ternary mixed crystal, the greater the red-shift amount will be. Absorption peak intensity of exciton light transition and variation range of linear optical refractive index are reduced by hydrostatic pressure. The absorption peak of optical transition and two peaks of linear optical refractive index move towards high energy direction, and blue-shift occurs..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 236 (2018)
Sensing characteristics of tapered fiber grating
Xinghua TU, and Shengge GENG
The sensing properties of tapered fiber grating (TFG) are theoretically analyzed. The influence of stress and temperature on characteristics of TFG reflection spectra of different taper angles is analyzed based on transfer matrix method. Results show that the center wavelength shifts to long wavelength and the reflectiThe sensing properties of tapered fiber grating (TFG) are theoretically analyzed. The influence of stress and temperature on characteristics of TFG reflection spectra of different taper angles is analyzed based on transfer matrix method. Results show that the center wavelength shifts to long wavelength and the reflection bandwidth is broadened with increasing of stress. The center wavelength and reflection bandwidth are all linear with the applied stress. The greater the taper angle is, the higher the stress sensitivity of center wavelength and reflection bandwidth will be. The center wavelength shifts to long wavelength when the temperature rises gradually, and the reflection bandwidth is constant. The center wavelength and reflection bandwidth are unchanged when the taper degree increases. The reflection bandwidth of TFG is temperature independent, and only dependent on stress, which can be used to solve the cross-sensitivity problem of temperature and stress..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 246 (2018)
Propagation characteristics of surface plasmonic waveguide with metalic elliptical
Bowen WU, Zhixiang HUANG, Lihua WANG, and Xianliang WU
An elliptical surface plasmonic waveguide with a high refractive index substrate is designed. Dependences of energy flux density distribution, effective refractive index, propagation length, effective area of the fundamental mode supported by the waveguide on the geometrical parameters and structure are analyzed based An elliptical surface plasmonic waveguide with a high refractive index substrate is designed. Dependences of energy flux density distribution, effective refractive index, propagation length, effective area of the fundamental mode supported by the waveguide on the geometrical parameters and structure are analyzed based on the finite element method. The energy density distribution shows that the energy is mainly distributed in the central region between two metallic elliptical cylinders, and there is also energy between the metal and germanium substrate, the substrate and substrate. Propagation characteristics of the waveguide mode can be analyzed by adjusting the centric distance of two ellipses and size of two semiaxis. With constant working wavelength, the effective refractive index decreases with increasing of center distance, while the propagation length increases..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 35, Issue 2, 252 (2018)
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