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RSS2007 Vol. 19, No. 04
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2007,
19.
Abstract:
980 nm GaAs/AlGaAs separate confinement hetero-structure single quantum well laser bars were grown by metal organic chemical vapor deposition. The relationships between the etching depth and the bars’ parameters have been studied. When the bar is not...
980 nm GaAs/AlGaAs separate confinement hetero-structure single quantum well laser bars were grown by metal organic chemical vapor deposition. The relationships between the etching depth and the bars’ parameters have been studied. When the bar is not...
2007,
19.
Abstract:
The 3-dimensional numerical simulation of nozzle and diffuser for COIL system is performed. Several nozzle and diffuser designs are compared and analzed. The gasdynamic process from cavity inlet till diffuser outlet is computated. The sufficient mixi...
The 3-dimensional numerical simulation of nozzle and diffuser for COIL system is performed. Several nozzle and diffuser designs are compared and analzed. The gasdynamic process from cavity inlet till diffuser outlet is computated. The sufficient mixi...
2007,
19.
Abstract:
Scintillation effect of divergent laser beam and beam wander effect of a focused laser beam were experimentally used to deduce the refractive index structure constant in atmospheric boundary layer over 1 km path above sea level. Different measurement...
Scintillation effect of divergent laser beam and beam wander effect of a focused laser beam were experimentally used to deduce the refractive index structure constant in atmospheric boundary layer over 1 km path above sea level. Different measurement...
2007,
19.
Abstract:
A multi-coupler side-pumped rare-earth-doped double-clad fiber laser with a novel dielectric-metal-dielectric(DMD) sandwich structure based on the theory of sub-wavelength diffraction grating is presented. A rigorous electromagnetic theory which cons...
A multi-coupler side-pumped rare-earth-doped double-clad fiber laser with a novel dielectric-metal-dielectric(DMD) sandwich structure based on the theory of sub-wavelength diffraction grating is presented. A rigorous electromagnetic theory which cons...
2007,
19.
Abstract:
Thermally induced birefringence and optical distortion in electro-optic slab switches were analyzed, and the influence of distribution of intensity on thermal effects was discussed. The distribution of temperature increment, thermal stress, optical d...
Thermally induced birefringence and optical distortion in electro-optic slab switches were analyzed, and the influence of distribution of intensity on thermal effects was discussed. The distribution of temperature increment, thermal stress, optical d...
2007,
19.
Abstract:
A resonator for 1.444 mm Nd:YAG laser was designed, and 1.444 mm laser was obtained, the maximum static-state output energy was 310 mJ, electric-optics conversion efficiency was 0.56% and slope efficiency was 0.81% when the pump energy was 55 J. The ...
A resonator for 1.444 mm Nd:YAG laser was designed, and 1.444 mm laser was obtained, the maximum static-state output energy was 310 mJ, electric-optics conversion efficiency was 0.56% and slope efficiency was 0.81% when the pump energy was 55 J. The ...
2007,
19.
Abstract:
The paper presents a system to measure pulse instantaneous thrust using PVDF, which can respond to high frequency signal, as the sensitive element. System calibration is completed using separate Hopkinson pressure bars(SHPB) whose diameter is 37 mm. ...
The paper presents a system to measure pulse instantaneous thrust using PVDF, which can respond to high frequency signal, as the sensitive element. System calibration is completed using separate Hopkinson pressure bars(SHPB) whose diameter is 37 mm. ...
2007,
19.
Abstract:
Based on orthogonal subspace projection algorithm, the algorithm was used to satellite optimum channels selection for underlying surface classification. The weight functions were obtained by analyzing target spectra distribution and background radian...
Based on orthogonal subspace projection algorithm, the algorithm was used to satellite optimum channels selection for underlying surface classification. The weight functions were obtained by analyzing target spectra distribution and background radian...
2007,
19.
Abstract:
Chan-Vese(C-V) model is an excellent model of simplified Mumford-Shah models. As Chan-Vese model is based on two homogenous regions, it causes failure in edge detection of infrared images. A level set method for edge detection of infrared image based...
Chan-Vese(C-V) model is an excellent model of simplified Mumford-Shah models. As Chan-Vese model is based on two homogenous regions, it causes failure in edge detection of infrared images. A level set method for edge detection of infrared image based...
2007,
19.
Abstract:
The fourth order Runge-algorithm was used in the numerical simulation methods to study the influences of the profiles and durations of pump pulse on the compressed pulses. The LBO crystal was used for the nonlinear gain medium in the numerical simula...
The fourth order Runge-algorithm was used in the numerical simulation methods to study the influences of the profiles and durations of pump pulse on the compressed pulses. The LBO crystal was used for the nonlinear gain medium in the numerical simula...
2007,
19.
Abstract:
Temperature distribution in high power fiber laser was approximately analyzed by thermal conductive equation and boundary condition.The rationality of numerical solution was validated by ANSYS simulation.The fiber laser coating’s critical temperature...
Temperature distribution in high power fiber laser was approximately analyzed by thermal conductive equation and boundary condition.The rationality of numerical solution was validated by ANSYS simulation.The fiber laser coating’s critical temperature...
2007,
19.
Abstract:
A middle heat exchanger with microchannels- microgrooves(MC- MG) is used to cool solid- state laser medium. Flow and heat transfer characteristics of MC- MG heat exchanger have been studied experimentally. The experimental results indicate that the N...
A middle heat exchanger with microchannels- microgrooves(MC- MG) is used to cool solid- state laser medium. Flow and heat transfer characteristics of MC- MG heat exchanger have been studied experimentally. The experimental results indicate that the N...
2007,
19.
Abstract:
The relationship between the impulse coupling coefficient and the distance of the target from focus at different incident laser energy, and the relationship between impulse coupling coefficient and laser spot diameter at different incident laser inte...
The relationship between the impulse coupling coefficient and the distance of the target from focus at different incident laser energy, and the relationship between impulse coupling coefficient and laser spot diameter at different incident laser inte...
2007,
19.
Abstract:
In this paper, contour plots comparing measured and calculated temperature profiles are presented. The results suggest numerical calculations accord with the measurements for dynamic temperature profiles in heat-capacity laser rods. During lasing pro...
In this paper, contour plots comparing measured and calculated temperature profiles are presented. The results suggest numerical calculations accord with the measurements for dynamic temperature profiles in heat-capacity laser rods. During lasing pro...
2007,
19.
Abstract:
This paper concerns solving deconvolution problem by constrain the noise in the degraded images in order to regularize the ill-posed characteristics. Adding constraint on degraded images during the deconvolution process, images of indoor point source...
This paper concerns solving deconvolution problem by constrain the noise in the degraded images in order to regularize the ill-posed characteristics. Adding constraint on degraded images during the deconvolution process, images of indoor point source...
2007,
19.
Abstract:
The energy distributions of fast electrons in fs laserplasma interactions have been measured using the magnetic spectrometers with various magnetic fields, fitted with the LiF thermoluminescent dosimeters (TLDs). The results show that the consistenc...
The energy distributions of fast electrons in fs laserplasma interactions have been measured using the magnetic spectrometers with various magnetic fields, fitted with the LiF thermoluminescent dosimeters (TLDs). The results show that the consistenc...
2007,
19.
Abstract:
Two different kinds of second harmonic antireflection(AR) coatings, with and without SiO2 barrier layer were prepared with ion assisted deposition on LiB3O5 crystal. Laser induced damage threshold(LIDT) by multiple-shot irradiation at 1 064 nm was st...
Two different kinds of second harmonic antireflection(AR) coatings, with and without SiO2 barrier layer were prepared with ion assisted deposition on LiB3O5 crystal. Laser induced damage threshold(LIDT) by multiple-shot irradiation at 1 064 nm was st...
2007,
19.
Abstract:
The Rayleigh scattering and Mach-Zehnder interferometry are employed to investigate the properties of argon and krypton clusters respectively. By comparing the size and density of the two kinds of clusters in detail, the factors of cluster formation ...
The Rayleigh scattering and Mach-Zehnder interferometry are employed to investigate the properties of argon and krypton clusters respectively. By comparing the size and density of the two kinds of clusters in detail, the factors of cluster formation ...
2007,
19.
Abstract:
The principal construction of wave-front sensor developed from the linear phase retrieval algorithm is described in this paper. In the laboratory, an experiment device was set up to study the characteristic of the new wave-front measuring method usin...
The principal construction of wave-front sensor developed from the linear phase retrieval algorithm is described in this paper. In the laboratory, an experiment device was set up to study the characteristic of the new wave-front measuring method usin...
2007,
19.
Abstract:
The plasma frequency and the electron collision frequency can be deduced with the plasma diagnostic method which utilizes the transmission attenuation of microwaves at three frequencies in a non-magnetized plasma. Then the electron density can be obt...
The plasma frequency and the electron collision frequency can be deduced with the plasma diagnostic method which utilizes the transmission attenuation of microwaves at three frequencies in a non-magnetized plasma. Then the electron density can be obt...
2007,
19.
Abstract:
The TDE-85/MeTHPA epoxy resin modified by polyurethane was prepared with polyurethane prepolymer (PUP, formulated by PPG and TDI), chain-extended reagent(1,4-BDO) and crosslink agent (TMP). The curing reaction mechanism and kinetics characters of the...
The TDE-85/MeTHPA epoxy resin modified by polyurethane was prepared with polyurethane prepolymer (PUP, formulated by PPG and TDI), chain-extended reagent(1,4-BDO) and crosslink agent (TMP). The curing reaction mechanism and kinetics characters of the...
2007,
19.
Abstract:
Sideon radiography technology can directly demonstrate the change of perturbation amplitude on target surface. In the experiment at Shenguang Ⅱ laser facility, this technology is used to detect rear surface perturbation caused by the ablation surfac...
Sideon radiography technology can directly demonstrate the change of perturbation amplitude on target surface. In the experiment at Shenguang Ⅱ laser facility, this technology is used to detect rear surface perturbation caused by the ablation surfac...
2007,
19.
Abstract:
With the Needle thin film synthesis method and Conjugate graduate refinement method, all-dielectric three-wavelength non-polarizing parallel plate beam splitters are designed. The chosen of materials component and initial stack are based on Costich a...
With the Needle thin film synthesis method and Conjugate graduate refinement method, all-dielectric three-wavelength non-polarizing parallel plate beam splitters are designed. The chosen of materials component and initial stack are based on Costich a...
2007,
19.
Abstract:
NaF films with preferred orientation have been successfully deposited on Si(100) substrate by pulsed laser deposition. The testing of surface profiler indicates that the deposition rate of the film increases exponentially with the increase of the sub...
NaF films with preferred orientation have been successfully deposited on Si(100) substrate by pulsed laser deposition. The testing of surface profiler indicates that the deposition rate of the film increases exponentially with the increase of the sub...
2007,
19.
Abstract:
A synthesis method for Pierce gun design is employed to develop a prototype. In order to evaluate the performance of the electron beam, an objective function is introduced, which takes perveance, beam waist and laminarity into consideration. A direct...
A synthesis method for Pierce gun design is employed to develop a prototype. In order to evaluate the performance of the electron beam, an objective function is introduced, which takes perveance, beam waist and laminarity into consideration. A direct...
2007,
19.
Abstract:
Latent failure study on the low-level human body model(HBM) electrostatic discharge(ESD) stresses on microelectric device was presented. The low-level ESD stresses were imposed on microwave low noise transistor 2SC3356 using the HBM from CB (collecto...
Latent failure study on the low-level human body model(HBM) electrostatic discharge(ESD) stresses on microelectric device was presented. The low-level ESD stresses were imposed on microwave low noise transistor 2SC3356 using the HBM from CB (collecto...
2007,
19.
Abstract:
Design methods for periodic permanent magnet focusing system are presented. Using E-GUN, SUPERFISH, MAFIA, and PIC, 2D and 3D simulation platforms of electron-optical system with plane symmetry are established, and the electron-optical system is X-ba...
Design methods for periodic permanent magnet focusing system are presented. Using E-GUN, SUPERFISH, MAFIA, and PIC, 2D and 3D simulation platforms of electron-optical system with plane symmetry are established, and the electron-optical system is X-ba...
2007,
19.
Abstract:
As a combination of load-limited MILO and tapered MILO, a double ladder cathode MILO is presented in this paper. This new type of MILO has six vanes, the first two work as the RF chokes, the middle three work as the slow wave structure, and the last ...
As a combination of load-limited MILO and tapered MILO, a double ladder cathode MILO is presented in this paper. This new type of MILO has six vanes, the first two work as the RF chokes, the middle three work as the slow wave structure, and the last ...
2007,
19.
Abstract:
In order to overcome the difficulties of manufacturing, a novel contrawound helix slowwave system is presented. The 3D soft CST MWS is used to simulate and investigate the influence of dimension parameters on the system’s dispersion and interaction ...
In order to overcome the difficulties of manufacturing, a novel contrawound helix slowwave system is presented. The 3D soft CST MWS is used to simulate and investigate the influence of dimension parameters on the system’s dispersion and interaction ...
2007,
19.
Abstract:
In wide band klystrons with high perveance electron beam, the charged particles show obvious transverse movement, and the energy exchange between kinetic electrons and gap field is a nonlinear interaction process. Fully considering these physical phe...
In wide band klystrons with high perveance electron beam, the charged particles show obvious transverse movement, and the energy exchange between kinetic electrons and gap field is a nonlinear interaction process. Fully considering these physical phe...
2007,
19.
Abstract:
An S band high power microwave multiplexer with three channels is investigated through numerical computation. The realized multiplexer works in the band of 2.65~2.75, 2.80~2.90 and 2.95~3.05 GHz. In each pass band, the transmission loss is less than ...
An S band high power microwave multiplexer with three channels is investigated through numerical computation. The realized multiplexer works in the band of 2.65~2.75, 2.80~2.90 and 2.95~3.05 GHz. In each pass band, the transmission loss is less than ...
2007,
19.
Abstract:
The nonlinear consistent equations were put forward which could describe beam-wave interaction in an relativistic backward wave oscillator(RBWO), using the nonlinear theory of RBWO. The nonlinear consistent equations were solved by numerical computat...
The nonlinear consistent equations were put forward which could describe beam-wave interaction in an relativistic backward wave oscillator(RBWO), using the nonlinear theory of RBWO. The nonlinear consistent equations were solved by numerical computat...
2007,
19.
Abstract:
A novel method in time domain for the response of high power EMP with braided-shield multiconductor cable is proposed. The current on the shield can be used as the stimulus of the MTL equations based on the definition of the transfer impedance. The ...
A novel method in time domain for the response of high power EMP with braided-shield multiconductor cable is proposed. The current on the shield can be used as the stimulus of the MTL equations based on the definition of the transfer impedance. The ...
2007,
19.
Abstract:
The microwave frequency of the coaxial vircator oscillator were 3.4 GHz and 3.7 GHz using different filtration efficienty of the anode mesh. Based on the experimental results, the beam distribution in the coaxial virtual cathode was analyzed. The eig...
The microwave frequency of the coaxial vircator oscillator were 3.4 GHz and 3.7 GHz using different filtration efficienty of the anode mesh. Based on the experimental results, the beam distribution in the coaxial virtual cathode was analyzed. The eig...
2007,
19.
Abstract:
In order to get extensive knowledge of radical production in a corona induced non-thermal plasma, the effect of discharge parameter, gas condition on emission intensity of OH(A2S+→X2P, 0-0) in a nozzle-to-plate corona radical shower system are experi...
In order to get extensive knowledge of radical production in a corona induced non-thermal plasma, the effect of discharge parameter, gas condition on emission intensity of OH(A2S+→X2P, 0-0) in a nozzle-to-plate corona radical shower system are experi...
2007,
19.
Abstract:
Electric carbon fiber is a promising material to emit cold electron under intensive electric field. Experiment was conducted to test carbon fiber’s emission at the pressures of 0.1 MPa, 10-1 Pa and 10-5 Pa. The diode gap between the fiber tip and the...
Electric carbon fiber is a promising material to emit cold electron under intensive electric field. Experiment was conducted to test carbon fiber’s emission at the pressures of 0.1 MPa, 10-1 Pa and 10-5 Pa. The diode gap between the fiber tip and the...
2007,
19.
Abstract:
Magnet design and modeling is a crucial task in the design of cyclotrons, which includes iterative processes from an initial model. The magnetic field distribution should fulfill the requirements of isochronisms and transverse focusing of the beam, a...
Magnet design and modeling is a crucial task in the design of cyclotrons, which includes iterative processes from an initial model. The magnetic field distribution should fulfill the requirements of isochronisms and transverse focusing of the beam, a...
2007,
19.
Abstract:
A linear induction accelerator (LIA) cell includes the pulse power system, the cavity and the reset system. By methods of cable delay and cable open circuit reflection, a burst double-pulse output can be generated by traditional LIA pulse power syste...
A linear induction accelerator (LIA) cell includes the pulse power system, the cavity and the reset system. By methods of cable delay and cable open circuit reflection, a burst double-pulse output can be generated by traditional LIA pulse power syste...
