Journals >Chinese Journal of Quantum Electronics
Contents
2005
Volume: 22 Issue 1
22 Article(s)
Export citation format
Research Article
Generation of cold or ultracold atomic beams and their applications
[in Chinese], and [in Chinese]
The basic principles, methods and experimental results on the generation of cold or ultracold atomic beams and their recent progresses are reviewed. The schemes to produce cold or ultracold atomic beams by laser cooling (Doppler, sub-Doppler and sub-recoil cooling) and magneto-optical trapping technique are introduced The basic principles, methods and experimental results on the generation of cold or ultracold atomic beams and their recent progresses are reviewed. The schemes to produce cold or ultracold atomic beams by laser cooling (Doppler, sub-Doppler and sub-recoil cooling) and magneto-optical trapping technique are introduced in detail, and the applications of cold or ultracold atomic beams in the studies of basic physical problems and atom optics are briefly introduced..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 1 (2005)
Several methods of measuring the refractive index of the film
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
It is important to measure the refractive index of the film precisely for designing and fabricating integrated optical devices. Several methods of measuring the refractive index were introduced and their principles and features were analysed.It is important to measure the refractive index of the film precisely for designing and fabricating integrated optical devices. Several methods of measuring the refractive index were introduced and their principles and features were analysed..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 13 (2005)
Research and implementation of the algorithm for data real-time and lossless compression and decompression basing on RICE for remote sensing image
[in Chinese], [in Chinese], and [in Chinese]
A lossless compression and decompression method is presented, which is based on RICE code recommended by CCSDS(Consultative Committee for space Data Systems). After bringing the function to software, the algorithm is optimized and the function is achieved successfully in FPGA using the Verilog hardware description langA lossless compression and decompression method is presented, which is based on RICE code recommended by CCSDS(Consultative Committee for space Data Systems). After bringing the function to software, the algorithm is optimized and the function is achieved successfully in FPGA using the Verilog hardware description language. The compression card and the decompression card which have been manufactured are small cubage, light weight and low power consumption. The system's highest processing speed can achieve 20M bits per second. It is possible to extend the data capability of this system. The system is mainly used for remote sensing image of MODIS. Its average compression ratio is over 1.6..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 19 (2005)
Object tracking algorithm for Hausdorff distance based on multiresolution
[in Chinese], and [in Chinese]
Because the calculation results and efficiency of the methods of tracking moving object available are not satisfactory, an algorithm using improved Hausdorff distance in the template matching was proposed, which is little in calculating amount and strong in adaptability. To track the object in a high speed, multiresoluBecause the calculation results and efficiency of the methods of tracking moving object available are not satisfactory, an algorithm using improved Hausdorff distance in the template matching was proposed, which is little in calculating amount and strong in adaptability. To track the object in a high speed, multiresolution analysis is adopted to deal with the array images. Experimental results demonstrate that this method can improve the accuracy and efficiency of tracking moving object remarkably..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 25 (2005)
Experimental study on scintillator's resolution in radiography system
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
X-ray is always returned to visible light for detection by scintillator in high energy radiography systems. The system's spatial resolution is effected by scintillator. Through experiments, the influence of several scintillator on modulate transfer function is analysised. The results are important to the quantitiveX-ray is always returned to visible light for detection by scintillator in high energy radiography systems. The system's spatial resolution is effected by scintillator. Through experiments, the influence of several scintillator on modulate transfer function is analysised. The results are important to the quantitive analyses of imaging system..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 30 (2005)
A multi-object optimization reconstruction technique for gas density computer tomography
[in Chinese], [in Chinese], and [in Chinese]
As a common image reconstruction algorithm for limited projection data, algebraic reconstruction technique has some disadvantages such as sensitive to the noise and bad reconstructed result for the noise. Considering the characteristics of the distribution of the gas density, a novel image reconstruction method named mAs a common image reconstruction algorithm for limited projection data, algebraic reconstruction technique has some disadvantages such as sensitive to the noise and bad reconstructed result for the noise. Considering the characteristics of the distribution of the gas density, a novel image reconstruction method named multi-object optimization image reconstruction was proposed. It is showed that the scheme can reduce the impact of the noise and improve the reconstructed image quality..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 34 (2005)
Analysis of magnetic pulse compressor in Ti:sapphire laser
[in Chinese], [in Chinese], and [in Chinese]
Magnetic pulse compressor (MPC) with thyratron as discharge switch used in Ti:Sapphire laser was put forward for the first time. A new type discharge circuit of Ti:sapphire laser power supply for the flash lamp is given, and both the principle and the function of MPC in the laser discharge circuit were described.Magnetic pulse compressor (MPC) with thyratron as discharge switch used in Ti:Sapphire laser was put forward for the first time. A new type discharge circuit of Ti:sapphire laser power supply for the flash lamp is given, and both the principle and the function of MPC in the laser discharge circuit were described..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 39 (2005)
Binary channel system of measuring the energy of pulsing laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We constitute a synchronous binary channel system of measuring the energy ofpulsing laser, by using AD and the probe of EM500 energy meter. The design approach of each portion, the method of calibration and checkout for the system were discassed. The result of calibration and checkout indicates that this system is precWe constitute a synchronous binary channel system of measuring the energy ofpulsing laser, by using AD and the probe of EM500 energy meter. The design approach of each portion, the method of calibration and checkout for the system were discassed. The result of calibration and checkout indicates that this system is precise and reliable. We can use this system to synchronously measure the energy of pulsing laser in two point of an optical system. Finally the applications of this system in the SRS experiment was presented..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 43 (2005)
Nonclassical properties of the excited double-mode SU(2) coherent state
[in Chinese], and [in Chinese]
The excited double-mode SU(2) coherent state is introduced and its nonclassical properties are investigated with numeric method. The results exhibit that when the photons are added to the fields of the double mode SU(2) coherent state, the two field modes can preserve anti-correlation character. The violation of CauchyThe excited double-mode SU(2) coherent state is introduced and its nonclassical properties are investigated with numeric method. The results exhibit that when the photons are added to the fields of the double mode SU(2) coherent state, the two field modes can preserve anti-correlation character. The violation of Cauchy-Schwartz inequality, the sub-Poissonian photon statistics properties and the anti-bunching effect of the fields are all enhanced..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 47 (2005)
Phase properties in the model of two coupling two-level atoms interacting with squeezed coherent light-field
[in Chinese], [in Chinese], and [in Chinese]
The phase properties in the system of the coupling two-level atoms interacting with squeezed coherent-state light-field is studied from the point of the Pegg-Barnett phase theory. The phase probability distribution and the phase fluctuation are investigated. Meanwhile, the influence of the field amplitude, the compressThe phase properties in the system of the coupling two-level atoms interacting with squeezed coherent-state light-field is studied from the point of the Pegg-Barnett phase theory. The phase probability distribution and the phase fluctuation are investigated. Meanwhile, the influence of the field amplitude, the compressed parameter, and the coupling coefficient between atoms on the phase properties is also discussed. The results show that the phase probability distribution presents three-peak Gaussian configuration. The maximum of the phase probability distribution lies at the point of the zero phase arid the phase fluctuation is small, while at other place the value of the phase probability distribution is relatively small and vibrates easily. At the same time, because of the influence of light-field squeezing effect, the phase probability distribution is different from that of coherent-state field..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 52 (2005)
Mean photon number evolution of two coupling two-level atoms interacting with squeezed light field
[in Chinese]
The photon statistical evolution in the process of two coupling two-level atoms interacting with the squeezed coherent state light field is investigated by means of the interacting picture and the quantum theory. Meanwhile, the influence of the squeezed light field factor γ, the coherent vibration amplitude |α|2 of theThe photon statistical evolution in the process of two coupling two-level atoms interacting with the squeezed coherent state light field is investigated by means of the interacting picture and the quantum theory. Meanwhile, the influence of the squeezed light field factor γ, the coherent vibration amplitude |α|2 of the field-atom, the coupling constant g of two atoms and the coupling constant λ of atom-field on the mean photon number of stimulated field are also discussed. The relations of them are revealed..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 57 (2005)
Quantum fluctuations of a mesoscopic RLC electic circuit in thermal coherent states and thermal squeezed states
[in Chinese]
By thermo-field dynamics (TFD), we study the quantum fluctuations of charge and magnetic flux of a mesoscopic circuit including resistor, inductor and capacitor (RLC) in coherent states and squeezed states at finite temperature. It is shown that the fluctuations of charge and magnetic flux depend on not only the parameBy thermo-field dynamics (TFD), we study the quantum fluctuations of charge and magnetic flux of a mesoscopic circuit including resistor, inductor and capacitor (RLC) in coherent states and squeezed states at finite temperature. It is shown that the fluctuations of charge and magnetic flux depend on not only the parameters of the circuit components but also the environmental temperature and squeezing parameters, while the fluctuations don't depend on displacement parameters..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 63 (2005)
Effects of generalized nonlinear unequal-power higher-power sum-squeezing of superposition state light-field composed of the two different multimode functional coherent states
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, the multimode squeezed state theory is utilized to study the characteristics of generalized nonlinear-unequal-power higher-power sum-squeezing of generalized magnetic-field component in the state |ψ(f)(2)>q made up of the linear superposition of multimode functional coherent state |{fj(x,y,z)}>q anIn this paper, the multimode squeezed state theory is utilized to study the characteristics of generalized nonlinear-unequal-power higher-power sum-squeezing of generalized magnetic-field component in the state |ψ(f)(2)>q made up of the linear superposition of multimode functional coherent state |{fj(x,y,z)}>q and its contrary state |{-fj(x,y,z)}>q according to the superposition principle of quantum state in quantum mechanics. It is found that: 1) under the condition of the sum of squeezing-power-number being an any even-number, thestate |ψ(f)(2)>q can always stay in the generalized nonlinear unequal-power Nj-H minimum uncertainty state;and 2) under the condition of the sum of squeezing-power-number being an anyodd-number, while some other fixed conditions are satisfied by the state |ψ(f)(2)>q the state mentioned can display the effects of generalized nonlinear unequal-power Nj-th power H-squeezing that changes periodically and alternatively..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 70 (2005)
Pressure effect on the polarization of electronic excited state in a GaN/GaAlN quantum well
[in Chinese], [in Chinese], and [in Chinese]
The pressure effect on the polarization of electronic excited state in a GaN/GaAlN quantum well is studied. The effects of the anisotropy of the wurtzite structure on the strain and the hydrostatic deformation potential are considered, including the build-in internal electric field. It is shown that, all of the electroThe pressure effect on the polarization of electronic excited state in a GaN/GaAlN quantum well is studied. The effects of the anisotropy of the wurtzite structure on the strain and the hydrostatic deformation potential are considered, including the build-in internal electric field. It is shown that, all of the electronic barrier height, the electronic effective masses and the strength of the polarization of the electronic excited state decrease linearly with pressure. But because of the localization of the electronic wave functions caused by the build-in internal electric field, the decreases are small..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 75 (2005)
Optimization of MOCVD-growth strain InGaAs/GaAs quantum wells and its application for 980 nm LD
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The strained InGaAs/GaAs quantum wells (QWs) for 980 nm LD were grown by MOCVD. The effects of growth temperature and growth rate of InGaAs/GaAs QWs were investigated. We applied the optimized growth condition to 980 high power LD growth. Without coating, an optical power output of 100 mW, Ith of 19 mA, differential efThe strained InGaAs/GaAs quantum wells (QWs) for 980 nm LD were grown by MOCVD. The effects of growth temperature and growth rate of InGaAs/GaAs QWs were investigated. We applied the optimized growth condition to 980 high power LD growth. Without coating, an optical power output of 100 mW, Ith of 19 mA, differential efficiency of 0.6 W/A were obtained..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 81 (2005)
Studies on the gain characteristic of the AlInGaAs/AlGaAs strain quantum well
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Using the Shu Lien Chuang method , the change of heavy and light hole energy caused by the strain calculated in the AlInGaAs/AlGaAs strain was quantum well. According to the Harrison model, the energy level distribution of the hole and electron in the strain AlIn-GaAs/AlGaAs quantum well and GaAs/AlGaAs unstrain quantuUsing the Shu Lien Chuang method , the change of heavy and light hole energy caused by the strain calculated in the AlInGaAs/AlGaAs strain was quantum well. According to the Harrison model, the energy level distribution of the hole and electron in the strain AlIn-GaAs/AlGaAs quantum well and GaAs/AlGaAs unstrain quantum well were detailedly calculated and discussed. Further, through calculating and comparing the different quantum wells linear gain, we obtained that the AlInGaAs/AlGaAs stain quantum well has the better optical gain characteristic than the GaAs/AlGaAs unstrain quantum well. So the AlInGaAs/AlGaAs stain quantum well semiconductor material was used to fabricate semiconductor laser with the advantage over the traditional GaAs/AlGaAs material..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 85 (2005)
Pedestal-free ultra-short pulse generation using nonlinear optical loop mirror by soliton compression effect
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
It is well known that the pulse nonadiabatically compressed in DDF has little pedestals. The DDF-NOLM for pulse compression and pedestal suppression were presented. Using this structure, the 20 ps pulse generated from a fiber laser was compressed to 1.42 ps with good spectral and temporal quality. And the pulse is suitIt is well known that the pulse nonadiabatically compressed in DDF has little pedestals. The DDF-NOLM for pulse compression and pedestal suppression were presented. Using this structure, the 20 ps pulse generated from a fiber laser was compressed to 1.42 ps with good spectral and temporal quality. And the pulse is suitable for propagation in the optical fiber..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 90 (2005)
High power broad bandwidth erbium-doped superfluorescent fiber source
[in Chinese], [in Chinese], and [in Chinese]
Characteristics of double-pass backward (DPB) superfluorescent fiber source (SFS) manufactured by heavily doped erbium fiber are investigated. Advantages of the superfluorescent source are its high output power and broad bandwidth. We achieve the optimum fiber length for obtaining largest bandwidth with certain pump poCharacteristics of double-pass backward (DPB) superfluorescent fiber source (SFS) manufactured by heavily doped erbium fiber are investigated. Advantages of the superfluorescent source are its high output power and broad bandwidth. We achieve the optimum fiber length for obtaining largest bandwidth with certain pump power by simulation. In the experiment, we use a 980 nm laser diode to pump a 10 m-length optimized Lucent-LRL fiber and use self-building fiber reflector loop to form the DPB SFS. Broad bandwidth superfluorescent fiber source with 26 mW output power is obtained with this configuration..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 95 (2005)
Fabrication of dual-wavelength fiber Bragg grating with a longitudinal stretch
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A method of fabricating dual-wavelength fiber Bragg grating with a uniform phase mask is demonstrated. Theoretical analysis and numerical simulation using matrix method are given. The moving exposing technique is adopted. A good control over the grating's reflectivity and the separation of the two Bragg wavelengthsA method of fabricating dual-wavelength fiber Bragg grating with a uniform phase mask is demonstrated. Theoretical analysis and numerical simulation using matrix method are given. The moving exposing technique is adopted. A good control over the grating's reflectivity and the separation of the two Bragg wavelengths is enabled by adjusting the stretch, the length of the grating, and the exposure. A grating with two equal transmission peak of 19.5 dB is obtained by using this method and the separation of the two Bragg wavelengths is 0.78 nm..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 98 (2005)
Preparation and application of silicon nitride passivation film
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The Si3N4 passivation films were deposited on the UHF high power semiconductor transistor chip by ECR-PECVD and the chip was passivated. The electric properties of passivated chip were analyzed. The results show that the electric properties of semiconductor chip have been improved, in which the reverse breakdown voltagThe Si3N4 passivation films were deposited on the UHF high power semiconductor transistor chip by ECR-PECVD and the chip was passivated. The electric properties of passivated chip were analyzed. The results show that the electric properties of semiconductor chip have been improved, in which the reverse breakdown voltage is increased and the reverse leakage current is reduced. The ratio of finished product has been improved..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 102 (2005)
In-flight MTF measurement of satellite-board CCD camera
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
It is important to the application of satellite remote sensing data and development of future satellite sensor to analyse in-flight satellite sensor imaging quality. The credible results depend on the logical, effective and practical means. A new technique was presented and proved by knife-edge method. The technique caIt is important to the application of satellite remote sensing data and development of future satellite sensor to analyse in-flight satellite sensor imaging quality. The credible results depend on the logical, effective and practical means. A new technique was presented and proved by knife-edge method. The technique can be used not only on high resolution satellite sensor but also on lower resolution one..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 106 (2005)
Investigation of measurements of polarized properties of atmospheric scattering radiation
[in Chinese], [in Chinese], and [in Chinese]
Measurements of polarized properties of atmospheric scattering radiation is one of an effective means of investigating the optical and physical parameters. Taking atmosphere of Hefei area as an example, using the field spectropolarimeter, a lot of polarized spectral measurement data of atmosphere have been obtained froMeasurements of polarized properties of atmospheric scattering radiation is one of an effective means of investigating the optical and physical parameters. Taking atmosphere of Hefei area as an example, using the field spectropolarimeter, a lot of polarized spectral measurement data of atmosphere have been obtained from the ground in different time and space. By calculating and analyzing, we obtained the distribution information of atmospheric polarization properties. This work can provide material in retrieving the parameter of atmospheric aerosol and modeling polarized properties of the atmospheric aerosol scattering radiation..
Chinese Journal of Quantum Electronics
- Publication Date: Feb. 01, 2005
- Vol. 22, Issue 1, 111 (2005)
© Copyright 2018-2021 | Chinese Laser Press. All Rights Reserved 沪ICP备15018463号-20