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RSS2007 Vol. 19, No. 08
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2007,
19.
Abstract:
Stabilization and spectrum narrowing of the emission wavelength of high-power diode laser array is demonstrated by a volume Bragg grating (VBG) resonator. The spectral full width half maximum of the output emission was suppressed by VBG cavity from 1...
Stabilization and spectrum narrowing of the emission wavelength of high-power diode laser array is demonstrated by a volume Bragg grating (VBG) resonator. The spectral full width half maximum of the output emission was suppressed by VBG cavity from 1...
2007,
19.
Abstract:
Coherent combination of multiple fiber laser is an effective method to get high power laser with excellent beam quality. However, recently developed high power fiber lasers have relatively long linewidths, which means degradation of coherence and dis...
Coherent combination of multiple fiber laser is an effective method to get high power laser with excellent beam quality. However, recently developed high power fiber lasers have relatively long linewidths, which means degradation of coherence and dis...
2007,
19.
Abstract:
An experiment of laser beam propagation was carried out on 3.5 km urbanised path. The irradiance scintillation and angle of arrival were synchronously measured. The statistical characteristic of irradiance fluctuation and atmospheric refractive-index...
An experiment of laser beam propagation was carried out on 3.5 km urbanised path. The irradiance scintillation and angle of arrival were synchronously measured. The statistical characteristic of irradiance fluctuation and atmospheric refractive-index...
2007,
19.
Abstract:
Fused silica is used as the material of the phase conjugated mirror. In the LD pumped laser MOPA system, phase conjugation through the stimulated Brillouin scattering is realized at the repetition frequency of 100 Hz and 400 Hz. At the repetition fre...
Fused silica is used as the material of the phase conjugated mirror. In the LD pumped laser MOPA system, phase conjugation through the stimulated Brillouin scattering is realized at the repetition frequency of 100 Hz and 400 Hz. At the repetition fre...
2007,
19.
Abstract:
Using the average parameters at the outlet of a mixing nozzle calculated based on experimental data of a chemical oxygen-iodine laser(COIL) apparatus without primary buffer gas as input conditions, the flow fields from the inlet of optical cavity to ...
Using the average parameters at the outlet of a mixing nozzle calculated based on experimental data of a chemical oxygen-iodine laser(COIL) apparatus without primary buffer gas as input conditions, the flow fields from the inlet of optical cavity to ...
2007,
19.
Abstract:
Taking single period injection as an example, the influence of frequency and fluctuation amplitude of the injection field on the dynamics and synchronization of semiconductor lasers are studied numerically. The single period injection is obtained thr...
Taking single period injection as an example, the influence of frequency and fluctuation amplitude of the injection field on the dynamics and synchronization of semiconductor lasers are studied numerically. The single period injection is obtained thr...
2007,
19.
Abstract:
According to the statistical model of the random phase screen, which is employed in the high power laser system, the phase noise and the first and second statistical characteristics of RMS gradient have been studied. The properties of the coherent an...
According to the statistical model of the random phase screen, which is employed in the high power laser system, the phase noise and the first and second statistical characteristics of RMS gradient have been studied. The properties of the coherent an...
2007,
19.
Abstract:
The rate equations including loss coefficients describing threshold pumped fiber lasers doped with quasi two-energy-level rare-earth ions have been analytically and fully solved. An analytical expression of the threshold pump power has been deduced, ...
The rate equations including loss coefficients describing threshold pumped fiber lasers doped with quasi two-energy-level rare-earth ions have been analytically and fully solved. An analytical expression of the threshold pump power has been deduced, ...
2007,
19.
Abstract:
In gasdynamics and chemical lasers, the supersonic diffuser plays an important role in the pressure recovery system. This paper introduces some experimental and numerical results of an experimental supersonic diffuser under the normal temperature con...
In gasdynamics and chemical lasers, the supersonic diffuser plays an important role in the pressure recovery system. This paper introduces some experimental and numerical results of an experimental supersonic diffuser under the normal temperature con...
2007,
19.
Abstract:
Using 1D MED101 code, the competition mechanism between nonequilibrium electrostatic field ablation and thermal equilibrium ablation was analyzed when the pulsed laser with wavelength 1 064 nm, pulse duration 1~20 ps, ablated copper in vacuum. Numeri...
Using 1D MED101 code, the competition mechanism between nonequilibrium electrostatic field ablation and thermal equilibrium ablation was analyzed when the pulsed laser with wavelength 1 064 nm, pulse duration 1~20 ps, ablated copper in vacuum. Numeri...
2007,
19.
Abstract:
Laser-driven flying plates technique(LDFT) is an important and feasible way to load materials and simulate high-velocity motion law of space articles. The momentum coupling model for laser-driven flying plates is one of the important research fields ...
Laser-driven flying plates technique(LDFT) is an important and feasible way to load materials and simulate high-velocity motion law of space articles. The momentum coupling model for laser-driven flying plates is one of the important research fields ...
2007,
19.
Abstract:
This paper presents our numerical analyses on the walk-off effect in periodically poled lithium niobate(PPLN) for optical parametric chirped pulse amplification in the front-stage of PW laser system with our simulation program. Under the 527 nm, 3 ns...
This paper presents our numerical analyses on the walk-off effect in periodically poled lithium niobate(PPLN) for optical parametric chirped pulse amplification in the front-stage of PW laser system with our simulation program. Under the 527 nm, 3 ns...
2007,
19.
Abstract:
Using the LARED-S code and referring to the NIF direct-drive DT ignition target, the effect of laser nonuniformity on the interior interface in direct-drive spherical implosion with high convergence ratio was numerically studied. The two-dimensional ...
Using the LARED-S code and referring to the NIF direct-drive DT ignition target, the effect of laser nonuniformity on the interior interface in direct-drive spherical implosion with high convergence ratio was numerically studied. The two-dimensional ...
2007,
19.
Abstract:
The frequency dependences of both amplitude and phase-shift of the first harmonic of the ring-down signal are measured by a lock-in amplifier in a phase-shift cavity ring-down technique (PS-CRD). With different frequency ranges, the cavity decay time...
The frequency dependences of both amplitude and phase-shift of the first harmonic of the ring-down signal are measured by a lock-in amplifier in a phase-shift cavity ring-down technique (PS-CRD). With different frequency ranges, the cavity decay time...
2007,
19.
Abstract:
Triangular silver nanoplates have been prepared by seed-mediated growth with CTAB as soft template, and their morphologies, chemical components and optical absorption properties have been characterized by TEM, EDX and UV-Vis. The results indicate tha...
Triangular silver nanoplates have been prepared by seed-mediated growth with CTAB as soft template, and their morphologies, chemical components and optical absorption properties have been characterized by TEM, EDX and UV-Vis. The results indicate tha...
2007,
19.
Abstract:
This paper discusses the deformation theory of large aperture optical element under thermal loads, and builds the finite element model by the software ANSYS. High precision sensors are used to measure the temperature around the optical elements in th...
This paper discusses the deformation theory of large aperture optical element under thermal loads, and builds the finite element model by the software ANSYS. High precision sensors are used to measure the temperature around the optical elements in th...
2007,
19.
Abstract:
Solvent effect and volume shrinkage ratio in melamine-formaldehyde gel aging process were discussed. Volume shrinkage ratio was analyzed from two aspects, the agingswelling balance and solvent effect. The results implied that the solution compositon...
Solvent effect and volume shrinkage ratio in melamine-formaldehyde gel aging process were discussed. Volume shrinkage ratio was analyzed from two aspects, the agingswelling balance and solvent effect. The results implied that the solution compositon...
2007,
19.
Abstract:
Based on the function analysis of target positioner for inertial confinement fusion, a kind of ICF target positioning robot system is designed to realize the adjustment and the alignment of a target. The robot system includes a target storage subsyst...
Based on the function analysis of target positioner for inertial confinement fusion, a kind of ICF target positioning robot system is designed to realize the adjustment and the alignment of a target. The robot system includes a target storage subsyst...
2007,
19.
Abstract:
The reflectivity calibration and correction of soft X-ray planar mirror is studied. Research is done on the 3W1B beamline of Beijing synchrotron radiation facility for mirrors with several materials, from 50 eV to 1 500 eV, with 40～120 mA beam curren...
The reflectivity calibration and correction of soft X-ray planar mirror is studied. Research is done on the 3W1B beamline of Beijing synchrotron radiation facility for mirrors with several materials, from 50 eV to 1 500 eV, with 40～120 mA beam curren...
2007,
19.
Abstract:
Using TEOS as precursor, ammonia as catalyst, silica antireflective coating was prepared by sol-gel process. To obtain hydrophobic properties, the silica coatings were surface-modified with fluoroal kylsilane(FAS) by self-assembly technique. FTIR-spe...
Using TEOS as precursor, ammonia as catalyst, silica antireflective coating was prepared by sol-gel process. To obtain hydrophobic properties, the silica coatings were surface-modified with fluoroal kylsilane(FAS) by self-assembly technique. FTIR-spe...
2007,
19.
Abstract:
Grazing-angle X-ray reflectivity(XRR) is described as an efficient, nondestructive means to measure the mass density of various amorphous carbon films down to the nanometer thickness range. Amorphous hydrogenated carbon films(α:CH films) are fabricat...
Grazing-angle X-ray reflectivity(XRR) is described as an efficient, nondestructive means to measure the mass density of various amorphous carbon films down to the nanometer thickness range. Amorphous hydrogenated carbon films(α:CH films) are fabricat...
2007,
19.
Abstract:
An improved process for fabrication of hollow microspheres used as innertial confinement fusion targets is the decomposable mandrel technique. Thermal gravity analysis and pyrolysis gas chromatorgraph/mass spectrometry were applied to obtaining the t...
An improved process for fabrication of hollow microspheres used as innertial confinement fusion targets is the decomposable mandrel technique. Thermal gravity analysis and pyrolysis gas chromatorgraph/mass spectrometry were applied to obtaining the t...
2007,
19.
Abstract:
Two different types of 1 064, 532 nm frequency-doubled antireflection coatings for X-LBO were deposited by electron beam evaporation. One stack is substrate /ZrO2/Y2O3/Al2O3/SiO2/air, and the other is substrate /Al2O3/ZrO2/Y2O3/Al2O3/SiO2/air. The ma...
Two different types of 1 064, 532 nm frequency-doubled antireflection coatings for X-LBO were deposited by electron beam evaporation. One stack is substrate /ZrO2/Y2O3/Al2O3/SiO2/air, and the other is substrate /Al2O3/ZrO2/Y2O3/Al2O3/SiO2/air. The ma...
2007,
19.
Abstract:
A six-port reflectometer for measuring the electrical thickness of radome and permittivity of dielectric material is introduced, which consists of a symmetrical five-port waveguide junction and a directional coupler. The key part of this system is th...
A six-port reflectometer for measuring the electrical thickness of radome and permittivity of dielectric material is introduced, which consists of a symmetrical five-port waveguide junction and a directional coupler. The key part of this system is th...
2007,
19.
Abstract:
A Cassegrain dual reflector antenna which consists of a TEM horn, a hyperbolical subreflector and a parabolic reflector, was developed to radiate high power UWB microwave. The Cassegrain dual reflector is formed by a 4.5 m parabolic reflector (the ra...
A Cassegrain dual reflector antenna which consists of a TEM horn, a hyperbolical subreflector and a parabolic reflector, was developed to radiate high power UWB microwave. The Cassegrain dual reflector is formed by a 4.5 m parabolic reflector (the ra...
2007,
19.
Abstract:
A conformal mesh-generating technique for FDTD analysis based on the object data originated from triangle-patch modeling in commercial software is presented. The crossing-points between grid lines and triangle-patch on the surface of objects are calc...
A conformal mesh-generating technique for FDTD analysis based on the object data originated from triangle-patch modeling in commercial software is presented. The crossing-points between grid lines and triangle-patch on the surface of objects are calc...
2007,
19.
Abstract:
Using a three-dimension fully electromagnetic particle-in-cell(PIC) code, double-gap output cavity of the S-band Relativistic Klystron Amplifier is simulated numerically. It is found that the microwave extraction power and efficiency is increased by ...
Using a three-dimension fully electromagnetic particle-in-cell(PIC) code, double-gap output cavity of the S-band Relativistic Klystron Amplifier is simulated numerically. It is found that the microwave extraction power and efficiency is increased by ...
2007,
19.
Abstract:
A new low-impedance axial transit-time oscillator with six cavities at C-band was designed, based on three-cavity transit time oscillator(TTO). The impedance of this oscillator is about 15 Ω, the microwave is exported in coaxial wave-guide. The oscil...
A new low-impedance axial transit-time oscillator with six cavities at C-band was designed, based on three-cavity transit time oscillator(TTO). The impedance of this oscillator is about 15 Ω, the microwave is exported in coaxial wave-guide. The oscil...
2007,
19.
Abstract:
According to the requirement of hard-tube magnetically insulated line oscillator(MILO), the diode of MILO is investigated. It has an insulator made of porcelain with ring slot and its shelter is improved. The length of the diode is shortened. With th...
According to the requirement of hard-tube magnetically insulated line oscillator(MILO), the diode of MILO is investigated. It has an insulator made of porcelain with ring slot and its shelter is improved. The length of the diode is shortened. With th...
2007,
19.
Abstract:
The mechanical properties of the main part of PKU photo-injector (3+1/2 cavity) are introduced. By optimizing the number and position of the stiff rings of the cavity with ANSYS and SUPERFISH code, the Lorentz force detuning problem when the cavity w...
The mechanical properties of the main part of PKU photo-injector (3+1/2 cavity) are introduced. By optimizing the number and position of the stiff rings of the cavity with ANSYS and SUPERFISH code, the Lorentz force detuning problem when the cavity w...
2007,
19.
Abstract:
Compared with the IH structure (110-mode), the CH structure (210-mode) can operate at higher frequencies (150~700 MHz) and can accelerate ions to higher energies (up to 150 MeV). Detailed microwave studio(MWS) simulations were performed for this stru...
Compared with the IH structure (110-mode), the CH structure (210-mode) can operate at higher frequencies (150~700 MHz) and can accelerate ions to higher energies (up to 150 MeV). Detailed microwave studio(MWS) simulations were performed for this stru...
2007,
19.
Abstract:
A new wire photon beam position monitor with a spring system was designed and installed in the machine diagnostic beamline in Hefei Light Source(HLS). The linearity range is 4 mm, and the sensitivity is about 0.197 9 mm-1. The beam current has a litt...
A new wire photon beam position monitor with a spring system was designed and installed in the machine diagnostic beamline in Hefei Light Source(HLS). The linearity range is 4 mm, and the sensitivity is about 0.197 9 mm-1. The beam current has a litt...
2007,
19.
Abstract:
This paper presents the measurement principle and the design of transverse impedance measurement setup with the wire method. The transverse impedance measurement system with a single wire is composed of a device under test (DUT)/reference line (REF),...
This paper presents the measurement principle and the design of transverse impedance measurement setup with the wire method. The transverse impedance measurement system with a single wire is composed of a device under test (DUT)/reference line (REF),...
2007,
19.
Abstract:
The energy spectrum and the angular distribution of the hot electrons generated by an ultra-intense femtosecond laser interacting with a solid target are studied. The intensity of the femtosecond laser is 8.5×1018 W·cm-2 and the pulse duration is 30 ...
The energy spectrum and the angular distribution of the hot electrons generated by an ultra-intense femtosecond laser interacting with a solid target are studied. The intensity of the femtosecond laser is 8.5×1018 W·cm-2 and the pulse duration is 30 ...
2007,
19.
Abstract:
According to the sensitivity curves of resists, the empirical formula of contrast was adopted to determine the relationship between exposure dose and etching depth accurately. Exposure experiments were carried out with positive resist PMMA. With curv...
According to the sensitivity curves of resists, the empirical formula of contrast was adopted to determine the relationship between exposure dose and etching depth accurately. Exposure experiments were carried out with positive resist PMMA. With curv...
2007,
19.
Abstract:
A surface treatment setup of coating TiN film on the inner face of stainless steel pipe vacuum chamber for accelerators at low temperature is described. A series of surface treatment parameters have been achieved through many coating experiments on a...
A surface treatment setup of coating TiN film on the inner face of stainless steel pipe vacuum chamber for accelerators at low temperature is described. A series of surface treatment parameters have been achieved through many coating experiments on a...
2007,
19.
Abstract:
An interaction potential with ch-2x form is introduced to describe the electron motion in superlattice quantum well, and in the frame of quantum mechanics, Schrodinger equation is transformed to the hypergeometric equation by this potential. The eige...
An interaction potential with ch-2x form is introduced to describe the electron motion in superlattice quantum well, and in the frame of quantum mechanics, Schrodinger equation is transformed to the hypergeometric equation by this potential. The eige...
2007,
19.
Abstract:
A series of ZnO thin films were deposited on silicon (100) substrate by facing target radio frequency magnetron sputtering system, and were annealed and supersonically treated. The samples were characterized by X-ray diffraction(XRD), atomic force mi...
A series of ZnO thin films were deposited on silicon (100) substrate by facing target radio frequency magnetron sputtering system, and were annealed and supersonically treated. The samples were characterized by X-ray diffraction(XRD), atomic force mi...
2007,
19.
Abstract:
The paper sets up an installation to produce glow discharge plasma and treat the capacitor film. Three kinds of capacitor films, including PP, PET and PPS films are treated by N2, O2 and Ar plasma. The infrared spectrums show that the change of matte...
The paper sets up an installation to produce glow discharge plasma and treat the capacitor film. Three kinds of capacitor films, including PP, PET and PPS films are treated by N2, O2 and Ar plasma. The infrared spectrums show that the change of matte...
2007,
19.
Abstract:
In wire-array Z-pinch experiments the images of one-dimensional temporal-spatial X-ray power were recorded by charge-coupled device(CCD). Data processing to correct the effects of non-ideal aspects, including the nonuniform optical transmission effic...
In wire-array Z-pinch experiments the images of one-dimensional temporal-spatial X-ray power were recorded by charge-coupled device(CCD). Data processing to correct the effects of non-ideal aspects, including the nonuniform optical transmission effic...
2007,
19.
Abstract:
A 4 MV coax-to-triplate multi-channel water dielectric self-breaking switch is designed for the oil and water section of a pulse power machine. The machine contains 24 modules with identical components. Eeach module contains Marx generator, intermedi...
A 4 MV coax-to-triplate multi-channel water dielectric self-breaking switch is designed for the oil and water section of a pulse power machine. The machine contains 24 modules with identical components. Eeach module contains Marx generator, intermedi...
