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RSS2005 Vol. 17, No. 06
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2005,
17.
Abstract:
By using the methods of matrix representation and complex Gaussian function expansion, the recurrence propagation formulae of a flattened Gaussian beam through multi-apertured optical ABCD systems are derived. Numerical examples are given to compare ...
By using the methods of matrix representation and complex Gaussian function expansion, the recurrence propagation formulae of a flattened Gaussian beam through multi-apertured optical ABCD systems are derived. Numerical examples are given to compare ...
2005,
17.
Abstract:
Different from a traditional double clad fiber laser, the front end of the double clad fiber is separated from the dichroic mirror which forms a Fabry-Perot filter. The efficiency of Fabry-Perot filter is analyzed theoretically. By adjusting the dist...
Different from a traditional double clad fiber laser, the front end of the double clad fiber is separated from the dichroic mirror which forms a Fabry-Perot filter. The efficiency of Fabry-Perot filter is analyzed theoretically. By adjusting the dist...
2005,
17.
Abstract:
In this paper, the modified 1-D time-dependent free electron laser (FEL) code is used to simulate the wavelength stabilization feedback system of a high average power FEL based on the parameters of Jefferson Lab's Demo-IR FEL facility. In the simulat...
In this paper, the modified 1-D time-dependent free electron laser (FEL) code is used to simulate the wavelength stabilization feedback system of a high average power FEL based on the parameters of Jefferson Lab's Demo-IR FEL facility. In the simulat...
2005,
17.
Abstract:
Improving illumination uniformity is one of the most important steps to restrain the influence of the atmospheric turbulence on free-space optical communication. Furthermore, partially coherent light source could be used to produce relative uniform i...
Improving illumination uniformity is one of the most important steps to restrain the influence of the atmospheric turbulence on free-space optical communication. Furthermore, partially coherent light source could be used to produce relative uniform i...
2005,
17.
Abstract:
From the flat-topped beam model proposed recently by Li and the Collins formula, an analytical propagation expression for the kurtosis parameter (K parameter) of flat-topped beams through a paraxial ABCD system is derived. The K parameter depends on ...
From the flat-topped beam model proposed recently by Li and the Collins formula, an analytical propagation expression for the kurtosis parameter (K parameter) of flat-topped beams through a paraxial ABCD system is derived. The K parameter depends on ...
2005,
17.
Abstract:
The threedimensional intensity distribution of the partially coherent beams focused by a lens is investigated. It is shown that the focused intensity distribution near the geometrical focus is dependent not only on the intensity distribution of the ...
The threedimensional intensity distribution of the partially coherent beams focused by a lens is investigated. It is shown that the focused intensity distribution near the geometrical focus is dependent not only on the intensity distribution of the ...
2005,
17.
Abstract:
The single-edge technique measuring Doppler shift of Rayleigh-scattering and Mie-scattering simultaneously is presented. The method is used to detect atmospheric wind velocity at low altitude（<12 km）. The error of the measurement caused by the atm...
The single-edge technique measuring Doppler shift of Rayleigh-scattering and Mie-scattering simultaneously is presented. The method is used to detect atmospheric wind velocity at low altitude（<12 km）. The error of the measurement caused by the atm...
2005,
17.
Abstract:
Accurate RKR potential functions and one of the best analytic potential functions � Murrell-Sorbie function have been combined with the best electric dipole moment functions to calculate the Einstein coefficients for HBr molecule. Calculations were d...
Accurate RKR potential functions and one of the best analytic potential functions � Murrell-Sorbie function have been combined with the best electric dipole moment functions to calculate the Einstein coefficients for HBr molecule. Calculations were d...
2005,
17.
Abstract:
An orthogonal subspace projection approach is introduced. Using the method, the background radiance can be eliminated from the received mixture signal. Using the matching pursuit algorithm, optimum wavelength bands can be picked out. The aim to detec...
An orthogonal subspace projection approach is introduced. Using the method, the background radiance can be eliminated from the received mixture signal. Using the matching pursuit algorithm, optimum wavelength bands can be picked out. The aim to detec...
2005,
17.
Abstract:
To reduce the reflection efficiency of the grating is the basic task during the design and fabricating process. Due to the speciality of the Brewster angle, the polarization light which propagates at Brewster angle can reduce the reflection efficienc...
To reduce the reflection efficiency of the grating is the basic task during the design and fabricating process. Due to the speciality of the Brewster angle, the polarization light which propagates at Brewster angle can reduce the reflection efficienc...
2005,
17.
Abstract:
Wavefront rms gradient is a very improtant optical parameter used in ICF system. Critical technique involved in numerical computation of wavefront gradient are space processing, frequency filtering and computing algorithm of gradient et al. The simpl...
Wavefront rms gradient is a very improtant optical parameter used in ICF system. Critical technique involved in numerical computation of wavefront gradient are space processing, frequency filtering and computing algorithm of gradient et al. The simpl...
2005,
17.
Abstract:
Under the conditions of the quick-charging to energy storage net with constant current and the pre-igniting of the Xe lamp, by controlling the voltage value and the repetitive frequency of the spark switch, the laser output in the heat capacity mode ...
Under the conditions of the quick-charging to energy storage net with constant current and the pre-igniting of the Xe lamp, by controlling the voltage value and the repetitive frequency of the spark switch, the laser output in the heat capacity mode ...
2005,
17.
Abstract:
A novel method of beam shaping by liquid crystal light valve (LCOS) is introduced in this paper. The incident phase modulation and spatial transmission properties of a shaped beam are studied, as well as the modulation characteristics of the liquid c...
A novel method of beam shaping by liquid crystal light valve (LCOS) is introduced in this paper. The incident phase modulation and spatial transmission properties of a shaped beam are studied, as well as the modulation characteristics of the liquid c...
Spectral gain narrowing compensation modulation function in high-power ultrashort-pulse laser system
2005,
17.
Abstract:
A modulation function related to the total gain of amplifier chains was established to compensate the spectral gain narrowing in high-power ultrashort-pulse laser systems. The modulation function to be used for a system could be given by putting in a...
A modulation function related to the total gain of amplifier chains was established to compensate the spectral gain narrowing in high-power ultrashort-pulse laser systems. The modulation function to be used for a system could be given by putting in a...
2005,
17.
Abstract:
Nomarski interferometer is an effective measurement to diagnose the electron density of laser-produced plasma. Using Raman compression cascade system with 1 054 nm incident light, a probe beam that has a 308 nm wavelength, 28 ps pulse duration and 1 ...
Nomarski interferometer is an effective measurement to diagnose the electron density of laser-produced plasma. Using Raman compression cascade system with 1 054 nm incident light, a probe beam that has a 308 nm wavelength, 28 ps pulse duration and 1 ...
2005,
17.
Abstract:
Concentration distribution expression of hydrogen diffusion process in multilayer polymer shells, that is the relationship among hydrogen concentration diffusion, time and diffusion distance was derived based on the second Fick's law. In each layer, ...
Concentration distribution expression of hydrogen diffusion process in multilayer polymer shells, that is the relationship among hydrogen concentration diffusion, time and diffusion distance was derived based on the second Fick's law. In each layer, ...
2005,
17.
Abstract:
The optical properties of inhomogeneous coatings which were prepared by double-source linear co-evaporation, were discussed and compared with that of homogeneous coatings. The influences of the refractive index distributions, maximum index-departure ...
The optical properties of inhomogeneous coatings which were prepared by double-source linear co-evaporation, were discussed and compared with that of homogeneous coatings. The influences of the refractive index distributions, maximum index-departure ...
2005,
17.
Abstract:
For rearching the acceleration mechanism of hot electron, the integrated image pattern and spectrum of optical transition radiation (OTR) were measured at the normal direction from the rear side of targets employing optical CCD camera and OMA optical...
For rearching the acceleration mechanism of hot electron, the integrated image pattern and spectrum of optical transition radiation (OTR) were measured at the normal direction from the rear side of targets employing optical CCD camera and OMA optical...
2005,
17.
Abstract:
High-quality metal films with theoretical density are important to measurement of equation of state under high temperature and high pressure. Mo films with thickness more than 20 μm, surface roughness(rms) less than 100 nm and thickness uniformity mo...
High-quality metal films with theoretical density are important to measurement of equation of state under high temperature and high pressure. Mo films with thickness more than 20 μm, surface roughness(rms) less than 100 nm and thickness uniformity mo...
2005,
17.
Abstract:
Pinhole imaging of the neutron production in laser-driven inertial confinement fusion experiments can provide important information about performance of various capsule designs. In order to get good results in experiments, it is needed to judge perfo...
Pinhole imaging of the neutron production in laser-driven inertial confinement fusion experiments can provide important information about performance of various capsule designs. In order to get good results in experiments, it is needed to judge perfo...
2005,
17.
Abstract:
Using a relatively strict method, the formulas of the harmonic current of the modulated electron beam in the klystron and Cherenkov devices were derived in the relativistic regime,in which the effect of the space charge wave was taken into account. T...
Using a relatively strict method, the formulas of the harmonic current of the modulated electron beam in the klystron and Cherenkov devices were derived in the relativistic regime,in which the effect of the space charge wave was taken into account. T...
2005,
17.
Abstract:
In order to solve the problem in calculating the klystron output circuit characteristic, based on field analysis and post-processing of 3D electromagnetic field simulation software ISFEL3D, a field analysis method is proposed. The theory analysis sho...
In order to solve the problem in calculating the klystron output circuit characteristic, based on field analysis and post-processing of 3D electromagnetic field simulation software ISFEL3D, a field analysis method is proposed. The theory analysis sho...
2005,
17.
Abstract:
Boundary element method(BEM) is presented as a new approach for the analysis and design of various transmission lines filled with piecewise homogeneous dielectric. The solution of the boundary-value problem associated with transmission lines filled w...
Boundary element method(BEM) is presented as a new approach for the analysis and design of various transmission lines filled with piecewise homogeneous dielectric. The solution of the boundary-value problem associated with transmission lines filled w...
2005,
17.
Abstract:
The design and the measurements of the coaxial fin-inserted mode converter are presented. It is shown that with four metal fins inserted in the coaxial waveguide, the TEM mode is converted to coaxial TE11 mode and outputted with different phases, and...
The design and the measurements of the coaxial fin-inserted mode converter are presented. It is shown that with four metal fins inserted in the coaxial waveguide, the TEM mode is converted to coaxial TE11 mode and outputted with different phases, and...
2005,
17.
Abstract:
The dynamics of radiation spectra of fast Z-pinch plasmas is studied on the S-300 machine. By means of the polychromator APCH—10, X-ray spectra of imploding wire arrays are measured in the range of 50~1 500 eV. The main part of the radiation power fa...
The dynamics of radiation spectra of fast Z-pinch plasmas is studied on the S-300 machine. By means of the polychromator APCH—10, X-ray spectra of imploding wire arrays are measured in the range of 50~1 500 eV. The main part of the radiation power fa...
2005,
17.
Abstract:
Experimental researches on operating characteristics of three-electrode repetitive gas switch were performed on the accelerator CHP01, and experimental results were analyzed. The results show that the switch operates more steadily at trigger mode tha...
Experimental researches on operating characteristics of three-electrode repetitive gas switch were performed on the accelerator CHP01, and experimental results were analyzed. The results show that the switch operates more steadily at trigger mode tha...
2005,
17.
Abstract:
Two-dimensional (2-D) geometry effect on space-charge-limited(SCL) current of an axially symmetrical planar diode was studied with 2.5 D particle-in-cell(PIC) simulation. A volume-weighting cloud-in-cell model was used to improve the accuracy of the ...
Two-dimensional (2-D) geometry effect on space-charge-limited(SCL) current of an axially symmetrical planar diode was studied with 2.5 D particle-in-cell(PIC) simulation. A volume-weighting cloud-in-cell model was used to improve the accuracy of the ...
2005,
17.
Abstract:
A diode- type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB6 thermionic cathode. The emitting area is a planar 2 mm- diameter, achieving transmitted currents up to 175 mA and a current density of 5.6 A/cm...
A diode- type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB6 thermionic cathode. The emitting area is a planar 2 mm- diameter, achieving transmitted currents up to 175 mA and a current density of 5.6 A/cm...
2005,
17.
Abstract:
In order to develop compact accelerators with small beam spot, a C-band 5.52 GHz 2 MeV SW accelerating tube is physically designed and studied, which operated in the π/2 mode. Not using any exterior focusing element，transverse emittance growth arouse...
In order to develop compact accelerators with small beam spot, a C-band 5.52 GHz 2 MeV SW accelerating tube is physically designed and studied, which operated in the π/2 mode. Not using any exterior focusing element，transverse emittance growth arouse...
2005,
17.
Abstract:
Conventional methods for electromagnetic compatibility (EMC) design of high power supplies are mostly based on experience. It can not insure the stability and reliability of the supply. A method was proposed to quantitatively analyse the electromagne...
Conventional methods for electromagnetic compatibility (EMC) design of high power supplies are mostly based on experience. It can not insure the stability and reliability of the supply. A method was proposed to quantitatively analyse the electromagne...
2005,
17.
Abstract:
In this paper the physical design and test of a new MITL for the Yang accelerator have been introduced. With reducing the total length of the MITL and width of the insulator, the common-vertex-coaxial-circular-cones-like MITL has been employed to dis...
In this paper the physical design and test of a new MITL for the Yang accelerator have been introduced. With reducing the total length of the MITL and width of the insulator, the common-vertex-coaxial-circular-cones-like MITL has been employed to dis...
2005,
17.
Abstract:
The mechanism of emission from ferroelectric cathode was introduced. With the purpose of obtaining the ferroelectric cathode material with large emission current density, the preparation conditions of PZT series ceramic were studied. By doping, modif...
The mechanism of emission from ferroelectric cathode was introduced. With the purpose of obtaining the ferroelectric cathode material with large emission current density, the preparation conditions of PZT series ceramic were studied. By doping, modif...
2005,
17.
Abstract:
Particles with low energy can not be accelerated only with harmonic number of 1 because of a restriction of the frequency range of the CSRm RF cavities with 0.25 to 1.7 MHz. This paper just simulated and studied the beam acceleration process of HIRFL...
Particles with low energy can not be accelerated only with harmonic number of 1 because of a restriction of the frequency range of the CSRm RF cavities with 0.25 to 1.7 MHz. This paper just simulated and studied the beam acceleration process of HIRFL...
2005,
17.
Abstract:
Some important effects of gas switch on power gain in the pulse compressed system of high power microwave are analyzed, including the absorbed energy of gas switch in the progress of opening, the descending resonance inhere quality factor because of ...
Some important effects of gas switch on power gain in the pulse compressed system of high power microwave are analyzed, including the absorbed energy of gas switch in the progress of opening, the descending resonance inhere quality factor because of ...
2005,
17.
Abstract:
Amorphous hydrogenated silicon carbide(a-SiC:H) films were prepared by the reactive sputtering method, which were irradiated by high energy (average value is 1.25 MeV) γ rays. The absorbed dose of five samples were 0, 2×104, 4×104, 6×104, and 8×104 G...
Amorphous hydrogenated silicon carbide(a-SiC:H) films were prepared by the reactive sputtering method, which were irradiated by high energy (average value is 1.25 MeV) γ rays. The absorbed dose of five samples were 0, 2×104, 4×104, 6×104, and 8×104 G...
2005,
17.
Abstract:
The signal detection system is an important part for BEPCII transverse feedback system. A commercial front-end RFTF (radio frequency front-end for transverse feedback system) was bought for this system. Two working modes and the remote control are it...
The signal detection system is an important part for BEPCII transverse feedback system. A commercial front-end RFTF (radio frequency front-end for transverse feedback system) was bought for this system. Two working modes and the remote control are it...
2005,
17.
Abstract:
The technology using optical transition radiation(OTR) is a measurement method for the electron beam of high energy and high current and it has been applied in the on-line beam diagnostic system with ultra-fast response, high special resolution. It m...
The technology using optical transition radiation(OTR) is a measurement method for the electron beam of high energy and high current and it has been applied in the on-line beam diagnostic system with ultra-fast response, high special resolution. It m...
