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RSS2007 Vol. 19, No. 07
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2007,
19.
Abstract:
The beam quality of unstable resonator of TEA CO2 coaxial output laser is deteriorated remarkably by the thermal accumulation of the output coupler. In order to improve the beam quality, a vortex tube cooling system of output coupler was adopted. The...
The beam quality of unstable resonator of TEA CO2 coaxial output laser is deteriorated remarkably by the thermal accumulation of the output coupler. In order to improve the beam quality, a vortex tube cooling system of output coupler was adopted. The...
2007,
19.
Abstract:
The theoretical model of high-power ytterbium-doped double-clad fiber amplifier was described, and the method for calculating amplified spomtaneous emission(ASE) was analyzed, with the amplifier operating in CW regime and pulse regime. The characteri...
The theoretical model of high-power ytterbium-doped double-clad fiber amplifier was described, and the method for calculating amplified spomtaneous emission(ASE) was analyzed, with the amplifier operating in CW regime and pulse regime. The characteri...
2007,
19.
Abstract:
Comparing several kinds of resonators with annular gain media, the new type of multipass resonator with two annular spherical mirrors which uses an entire working surface output is considered suitable for a kind of high power CO2 laser. A new method ...
Comparing several kinds of resonators with annular gain media, the new type of multipass resonator with two annular spherical mirrors which uses an entire working surface output is considered suitable for a kind of high power CO2 laser. A new method ...
2007,
19.
Abstract:
For a monodispersion of water coated carbon particles in internal mixing state, the validity of equivalent refractive index for describing the internal mixture of aerosol particles with different complex refractive indexes is analyzed by their scatte...
For a monodispersion of water coated carbon particles in internal mixing state, the validity of equivalent refractive index for describing the internal mixture of aerosol particles with different complex refractive indexes is analyzed by their scatte...
2007,
19.
Abstract:
Based on the application demands of high-power laser phase-conjugate systems, the potential of Brillouin-enhanced four-wave mixing(BEFWM) applying in this field is represented. Correspondingly, physical mechanism and output characteristics of BEFWM w...
Based on the application demands of high-power laser phase-conjugate systems, the potential of Brillouin-enhanced four-wave mixing(BEFWM) applying in this field is represented. Correspondingly, physical mechanism and output characteristics of BEFWM w...
2007,
19.
Abstract:
Methods for cloud scene simulation are analyzed and studied based on the properties of real cloud edge and distribution of sky radiance. A model is used to simulate cloud scene by means of fractal geometry algorithm after effects on the sky radiance ...
Methods for cloud scene simulation are analyzed and studied based on the properties of real cloud edge and distribution of sky radiance. A model is used to simulate cloud scene by means of fractal geometry algorithm after effects on the sky radiance ...
2007,
19.
Abstract:
A homemade large-mode-area(LMA) multimode fiber before and after coiling was studied contrastively in the experiment. Single-transverse-mode output was achieved when the fiber laser was coiled around a mandrel of 65 mm radius. After coiling, beam qua...
A homemade large-mode-area(LMA) multimode fiber before and after coiling was studied contrastively in the experiment. Single-transverse-mode output was achieved when the fiber laser was coiled around a mandrel of 65 mm radius. After coiling, beam qua...
2007,
19.
Abstract:
For the main light amplification of high-power solid laser devices, an on-line damage-detecting system is designed. With its invariable magnification specialty, a telescope is used to on-line detect any damage information on different optical compone...
For the main light amplification of high-power solid laser devices, an on-line damage-detecting system is designed. With its invariable magnification specialty, a telescope is used to on-line detect any damage information on different optical compone...
2007,
19.
Abstract:
Started from the nonlocal nonlinear Schrdinger equation, the split-step method was used to numerically discuss propogation properies of (1+2) dimension spatial optical sotions with definite degrees of nonlocality, and a set of parameters of soliton ...
Started from the nonlocal nonlinear Schrdinger equation, the split-step method was used to numerically discuss propogation properies of (1+2) dimension spatial optical sotions with definite degrees of nonlocality, and a set of parameters of soliton ...
2007,
19.
Abstract:
Theories and methods of online measurement of high energy laser were introduced, and some uncertainty sources were analyzed. The elimination of abnormal data as well as means to deal with standard uncertainty and combined standard uncertainty is illu...
Theories and methods of online measurement of high energy laser were introduced, and some uncertainty sources were analyzed. The elimination of abnormal data as well as means to deal with standard uncertainty and combined standard uncertainty is illu...
2007,
19.
Abstract:
The characteristics of a new kind of linear phase retrieval(LPR) wavefront measuring method were analyzed. The process of calibration was discussed and the basic construct of the LPR was described. The influences of the system aberration, the charact...
The characteristics of a new kind of linear phase retrieval(LPR) wavefront measuring method were analyzed. The process of calibration was discussed and the basic construct of the LPR was described. The influences of the system aberration, the charact...
2007,
19.
Abstract:
A model of atmospheric boundary layer, which has adopted Bulk method, is used to estimate the refractive index structure parameter in southeast seashore and Hefei. A high resolution three dimensional sonic anemometers was used instead of micro-therma...
A model of atmospheric boundary layer, which has adopted Bulk method, is used to estimate the refractive index structure parameter in southeast seashore and Hefei. A high resolution three dimensional sonic anemometers was used instead of micro-therma...
2007,
19.
Abstract:
Introducing the tip-tilt and piston error as the parameter and defining the aperture function of the tiled-grating, far-field property was analyzed with Gaussian beam incidence using the theory of Fourier angular spectrum. The results showed that the...
Introducing the tip-tilt and piston error as the parameter and defining the aperture function of the tiled-grating, far-field property was analyzed with Gaussian beam incidence using the theory of Fourier angular spectrum. The results showed that the...
2007,
19.
Abstract:
The misalignment of 4f-configure femtosecond pulse shaping system with space-time conversion can cause aberrations of the output pulse. With theoretical analysis, the effect of the mismatched spacing between the components of 4f Fourier processing sy...
The misalignment of 4f-configure femtosecond pulse shaping system with space-time conversion can cause aberrations of the output pulse. With theoretical analysis, the effect of the mismatched spacing between the components of 4f Fourier processing sy...
2007,
19.
Abstract:
Keeping the single pulse energy of CO2 laser constant, the impulse coupling coefficients in air-breathing laser propulsion are measured at different air pressure with a high precision impact pendulum system and the altitude characteristics are analyz...
Keeping the single pulse energy of CO2 laser constant, the impulse coupling coefficients in air-breathing laser propulsion are measured at different air pressure with a high precision impact pendulum system and the altitude characteristics are analyz...
2007,
19.
Abstract:
Based on the facility experimental records and the flashlamp fault data, ten phenomena of faults are found and they are classified into three categories, trigger failures, electrical insulation failures, and flashlamp explosions. Two distinct kinds o...
Based on the facility experimental records and the flashlamp fault data, ten phenomena of faults are found and they are classified into three categories, trigger failures, electrical insulation failures, and flashlamp explosions. Two distinct kinds o...
2007,
19.
Abstract:
A one-dimensional model was constructed to calculate the gas density profile within a few millimeters of the conical nozzle. The result from the model is in agreement with experiments. A program was developed to deal with data taken by the M-Z interf...
A one-dimensional model was constructed to calculate the gas density profile within a few millimeters of the conical nozzle. The result from the model is in agreement with experiments. A program was developed to deal with data taken by the M-Z interf...
2007,
19.
Abstract:
Shenguang-Ⅲ prototype is a multi-pass laser amplification system which includes a particular configuration of 4-pass amplifier. The beam rotates 90° and expands when it passes the 4-pass amplifier. A new scheme of adaptive optics for system aberratio...
Shenguang-Ⅲ prototype is a multi-pass laser amplification system which includes a particular configuration of 4-pass amplifier. The beam rotates 90° and expands when it passes the 4-pass amplifier. A new scheme of adaptive optics for system aberratio...
2007,
19.
Abstract:
Based on multi-segment apertures and gain media of Nd:YAG slabs, a new design of solid-state laser oscillator and its preliminary experimental results are presented.The output characteristics of the laser are researched. 2×1 multi-segment apertures a...
Based on multi-segment apertures and gain media of Nd:YAG slabs, a new design of solid-state laser oscillator and its preliminary experimental results are presented.The output characteristics of the laser are researched. 2×1 multi-segment apertures a...
2007,
19.
Abstract:
Considering the stability requirement of the spatial filter system in ShenguangⅡ facility, a modal test was carried out to analysis the spatial filter system to check its working performance. The key parameters which control the stability system are ...
Considering the stability requirement of the spatial filter system in ShenguangⅡ facility, a modal test was carried out to analysis the spatial filter system to check its working performance. The key parameters which control the stability system are ...
2007,
19.
Abstract:
In order to test large aperture and high steep aspheric surfaces accurately during the grinding and polishing process, a new method combining the subaperture stitching and null compensation was proposed. The principle of the technique was introduced,...
In order to test large aperture and high steep aspheric surfaces accurately during the grinding and polishing process, a new method combining the subaperture stitching and null compensation was proposed. The principle of the technique was introduced,...
2007,
19.
Abstract:
By the model of damage induced by inclusions in dielectric thin-films, with the experiment done by S.Papernov et al who deposited HfO2 thin-films containing gold nanoparticles on a cleaved fused-silica by e-beam evaporation, the absorption cross-sect...
By the model of damage induced by inclusions in dielectric thin-films, with the experiment done by S.Papernov et al who deposited HfO2 thin-films containing gold nanoparticles on a cleaved fused-silica by e-beam evaporation, the absorption cross-sect...
2007,
19.
Abstract:
The actual distribution of film thickness of a 2.2 meter coating plant has been studied. The uniformity of film thickness has been adjusted by correction mask in experiments. Utilizing correction mask, preferable uniformity values of optical componen...
The actual distribution of film thickness of a 2.2 meter coating plant has been studied. The uniformity of film thickness has been adjusted by correction mask in experiments. Utilizing correction mask, preferable uniformity values of optical componen...
2007,
19.
Abstract:
The technique of low-temperature electroless-plating nickel on the polyurethane foam in synthesizing nickel foams was investigated. The main factors affecting the deposition rate such as temperature, pH value, the concentration of nickle sulfate and ...
The technique of low-temperature electroless-plating nickel on the polyurethane foam in synthesizing nickel foams was investigated. The main factors affecting the deposition rate such as temperature, pH value, the concentration of nickle sulfate and ...
2007,
19.
Abstract:
This paper describes the elliptical crystal spectrograph(ECS) which is used to investigate X-ray spectroscopy of laser-produced plasmas. The spectrometer was calibrated for experiments on “Shenguang Ⅱ” X laser target chamber. The K-shell and M-shell ...
This paper describes the elliptical crystal spectrograph(ECS) which is used to investigate X-ray spectroscopy of laser-produced plasmas. The spectrometer was calibrated for experiments on “Shenguang Ⅱ” X laser target chamber. The K-shell and M-shell ...
2007,
19.
Abstract:
For reentrant and pillbox cavities widely used in klystrons, on the premise of omitting the thickness of the drift tube, we have deduced the characteristic equation for predicting the resonant frequency of these cavities accurately. Moreover, the ana...
For reentrant and pillbox cavities widely used in klystrons, on the premise of omitting the thickness of the drift tube, we have deduced the characteristic equation for predicting the resonant frequency of these cavities accurately. Moreover, the ana...
2007,
19.
Abstract:
In order to enhance bandwidth of output circuit for klystron, the theory of overlapped mode is analyzed. Possibility of overlapped three-mode is illuminated. Gap-impedance frequency distribution for three-mode overlapped two-gap coupled cavity type o...
In order to enhance bandwidth of output circuit for klystron, the theory of overlapped mode is analyzed. Possibility of overlapped three-mode is illuminated. Gap-impedance frequency distribution for three-mode overlapped two-gap coupled cavity type o...
2007,
19.
Abstract:
The energy-splitter is widely used in microwave engineering. Finite-difference time-domain(FDTD) method is used to analyze and verify new accurate energy-split structures with perfectly matched lossy left-handed-material(LHM) slabs or ring. From thes...
The energy-splitter is widely used in microwave engineering. Finite-difference time-domain(FDTD) method is used to analyze and verify new accurate energy-split structures with perfectly matched lossy left-handed-material(LHM) slabs or ring. From thes...
2007,
19.
Abstract:
Considering that generation and maintain of small radius, high power beam is restricted by the compression ratio of electron gun, the effect of magnetic field on electron trajectories in transition region was analyzed. A method was presented to compr...
Considering that generation and maintain of small radius, high power beam is restricted by the compression ratio of electron gun, the effect of magnetic field on electron trajectories in transition region was analyzed. A method was presented to compr...
2007,
19.
Abstract:
In an MFCG, the magnetic field generated by the current of stator coils is compressed by the expanding armature. It is important to compute the value of the magnetic field exactly, for it is relevant to the output current of MFCG. Formulas of magneti...
In an MFCG, the magnetic field generated by the current of stator coils is compressed by the expanding armature. It is important to compute the value of the magnetic field exactly, for it is relevant to the output current of MFCG. Formulas of magneti...
2007,
19.
Abstract:
Bipolar junction transistors may be burned out by injected electromagnetic pulse. The circuits play important rolls because EMP is always coupled to circuit by antenna or aperture firstly and injected in BJT by circuit afterwards. The current distrib...
Bipolar junction transistors may be burned out by injected electromagnetic pulse. The circuits play important rolls because EMP is always coupled to circuit by antenna or aperture firstly and injected in BJT by circuit afterwards. The current distrib...
2007,
19.
Abstract:
A high-current ion beam emittance measurement unit Allison scanner was introduced. The scanner consists of two slits and a pair of electrical deflection plates driven by a ±1.2 kV bipolar power supply. When the scanner moves to a measurement position...
A high-current ion beam emittance measurement unit Allison scanner was introduced. The scanner consists of two slits and a pair of electrical deflection plates driven by a ±1.2 kV bipolar power supply. When the scanner moves to a measurement position...
2007,
19.
Abstract:
The deficiencies in traditional H-D curve measurements in high-energy flash X-ray radiography are analyzed and the relationship between the optical density and X-ray exposure is obtained using Monte Carlo simulations. A spherical symmetrical object i...
The deficiencies in traditional H-D curve measurements in high-energy flash X-ray radiography are analyzed and the relationship between the optical density and X-ray exposure is obtained using Monte Carlo simulations. A spherical symmetrical object i...
2007,
19.
Abstract:
For high energy particles produced in advanced fuel D-3He fusion reactions, the calculation accuracy of their slowing down time has a direct and notable impact on energy balance and pressure of high energy particles during the initial phase of therma...
For high energy particles produced in advanced fuel D-3He fusion reactions, the calculation accuracy of their slowing down time has a direct and notable impact on energy balance and pressure of high energy particles during the initial phase of therma...
2007,
19.
Abstract:
MCNP simulation method of neutron radiography is introduced.The process that Maxwell thermal neutron penetrates the samples is simulated,and clear images are obtained.The contrast of simulation results and actual neutron radiography is also given.The...
MCNP simulation method of neutron radiography is introduced.The process that Maxwell thermal neutron penetrates the samples is simulated,and clear images are obtained.The contrast of simulation results and actual neutron radiography is also given.The...
2007,
19.
Abstract:
An approach to reducing the pulse duration of the compact two-stage helical explosive magnetic generators (EMGs) is to increase the conical angle of the helical coil in the second stage, but it will result in quick effective inductance decrease of th...
An approach to reducing the pulse duration of the compact two-stage helical explosive magnetic generators (EMGs) is to increase the conical angle of the helical coil in the second stage, but it will result in quick effective inductance decrease of th...
2007,
19.
Abstract:
A bunch charge monitor system has been designed for the photocathode RF gun of Accelerator Laboratory, Tsinghua University. Integrating current transformer is the most important part of the system, and parts of the system after integrating current tr...
A bunch charge monitor system has been designed for the photocathode RF gun of Accelerator Laboratory, Tsinghua University. Integrating current transformer is the most important part of the system, and parts of the system after integrating current tr...
2007,
19.
Abstract:
In an axially symmetric magnetic field, charged particles move along the axis and rotate around the axis at the same time. Accordingly, the transverse motion can be decomposed into two parts, the focusing movement and the rotation of the meridian pla...
In an axially symmetric magnetic field, charged particles move along the axis and rotate around the axis at the same time. Accordingly, the transverse motion can be decomposed into two parts, the focusing movement and the rotation of the meridian pla...
