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RSS2005 Vol. 17, No. 11
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2005,
17.
Abstract:
A precise measurement system of high reflectivity for scanning large aperture components in high power laser system is developed. The structure and working principle of this system are introduced, and those factors that influence its metrical precisi...
A precise measurement system of high reflectivity for scanning large aperture components in high power laser system is developed. The structure and working principle of this system are introduced, and those factors that influence its metrical precisi...
2005,
17.
Abstract:
Based on the standing-wave theory, a theoretical model with high energy absorption at the surface and interfaces is employed to describe laser-induced damages to optical multilayer films. The temperature distributions in two types of reflective multi...
Based on the standing-wave theory, a theoretical model with high energy absorption at the surface and interfaces is employed to describe laser-induced damages to optical multilayer films. The temperature distributions in two types of reflective multi...
2005,
17.
Abstract:
Barium nitrate crystal was proposed as one of the perspective Raman materials due to its intense symmetrical vibrations with the frequency of 1 047 cm-1 and comparative high Raman gain. A harmonic of Nd:YAG laser (532 nm) pumped barium nitrate crysta...
Barium nitrate crystal was proposed as one of the perspective Raman materials due to its intense symmetrical vibrations with the frequency of 1 047 cm-1 and comparative high Raman gain. A harmonic of Nd:YAG laser (532 nm) pumped barium nitrate crysta...
2005,
17.
Abstract:
When a laser beam irradiates a cylinder shell, the irradiated area becomes softer and the cylinder shell will be destroyed. In this paper, a 3-D solid element was adopted to simulate the stresses of internally pressured static and rotational cylinder...
When a laser beam irradiates a cylinder shell, the irradiated area becomes softer and the cylinder shell will be destroyed. In this paper, a 3-D solid element was adopted to simulate the stresses of internally pressured static and rotational cylinder...
2005,
17.
Abstract:
This paper gives a new method of solution to fluid field in the DF chemical laser combustion chamber. The method is a numerical solution of multi-component chemical equilibrium flows with the elements distributing equations and thermodynamic calculat...
This paper gives a new method of solution to fluid field in the DF chemical laser combustion chamber. The method is a numerical solution of multi-component chemical equilibrium flows with the elements distributing equations and thermodynamic calculat...
2005,
17.
Abstract:
The frequency upshifting and differential cross section of the laser synchrotron source (LSS) are studied based on the Thomson backscattering of intense laser radiation from a counterstreaming relativistic electron. A counterstreaming relativistic el...
The frequency upshifting and differential cross section of the laser synchrotron source (LSS) are studied based on the Thomson backscattering of intense laser radiation from a counterstreaming relativistic electron. A counterstreaming relativistic el...
2005,
17.
Abstract:
External cavity feedback for a broad-area laser diode (BAL) with antireflection coating on the front facet was investigated experimentally. The feedback was created by a high-reflection mirror and a blazed grating, which reflected two parts of the la...
External cavity feedback for a broad-area laser diode (BAL) with antireflection coating on the front facet was investigated experimentally. The feedback was created by a high-reflection mirror and a blazed grating, which reflected two parts of the la...
2005,
17.
Abstract:
Multi-order Stokes is generated in H2 pumped by a pulsed Nd:YAG laser at 532 nm. Maximum energy conversion efficiencies as high as 66%， 60% and 19% are attained for the first，second and third Stokes respectively. Under 0.44 MPa H2, significant multi-...
Multi-order Stokes is generated in H2 pumped by a pulsed Nd:YAG laser at 532 nm. Maximum energy conversion efficiencies as high as 66%， 60% and 19% are attained for the first，second and third Stokes respectively. Under 0.44 MPa H2, significant multi-...
2005,
17.
Abstract:
In an optical system, “cat eye effect” can be modeled as a focus lens system. When a system has some opto-electrical devices and is illuminated by a laser beam, the laser beam will be reflected from the system along incident direction as a result of ...
In an optical system, “cat eye effect” can be modeled as a focus lens system. When a system has some opto-electrical devices and is illuminated by a laser beam, the laser beam will be reflected from the system along incident direction as a result of ...
2005,
17.
Abstract:
From the Helmholtz equation, the optical field analytical expression of an ultrashort pulse propagating through a small aperture lens was acquired with chromatic and spherical aberration. By numerical modulation of the analytical expression, the spat...
From the Helmholtz equation, the optical field analytical expression of an ultrashort pulse propagating through a small aperture lens was acquired with chromatic and spherical aberration. By numerical modulation of the analytical expression, the spat...
2005,
17.
Abstract:
We present a four-rod series resonator CW Nd:YAG laser for the requirement of industrial application in this paper. The symmetrical resonator laser has been developed and is rated at 2 105 W output power with beam parameter product of 24 mm·mrad. The...
We present a four-rod series resonator CW Nd:YAG laser for the requirement of industrial application in this paper. The symmetrical resonator laser has been developed and is rated at 2 105 W output power with beam parameter product of 24 mm·mrad. The...
2005,
17.
Abstract:
The laser heating process of flying cylinder is discussed by means of geometry analysis. The meaning of heating configuration is defined and explained, the significance of this item in describing effective heating of the flying cylinder is pointed ou...
The laser heating process of flying cylinder is discussed by means of geometry analysis. The meaning of heating configuration is defined and explained, the significance of this item in describing effective heating of the flying cylinder is pointed ou...
2005,
17.
Abstract:
In order to get the plasma in air for aircraft stealth, this paper calculates the breakdown threshold of atmosphere from semi-classic theory. The main subjects include the connection between the breakdown threshold and atmosphere pressure, and the co...
In order to get the plasma in air for aircraft stealth, this paper calculates the breakdown threshold of atmosphere from semi-classic theory. The main subjects include the connection between the breakdown threshold and atmosphere pressure, and the co...
2005,
17.
Abstract:
The two-step（acid-base）sol-gel process was used to prepare SiO2 aerogels, with TEOS as the precursor. The influence of catalyst, water and solvent on the sol-gel process was investigated to optimize the experimental conditions. Ultralow-density silic...
The two-step（acid-base）sol-gel process was used to prepare SiO2 aerogels, with TEOS as the precursor. The influence of catalyst, water and solvent on the sol-gel process was investigated to optimize the experimental conditions. Ultralow-density silic...
2005,
17.
Abstract:
The development of a Ti:sapphire CPA laser facility named SILEX-I with the peak power of hundred terawatt level is reported. SILEX-I includes the femtosecond oscillator, the Offner stretcher, the regenerative amplifier, the pre-amplifier, the main am...
The development of a Ti:sapphire CPA laser facility named SILEX-I with the peak power of hundred terawatt level is reported. SILEX-I includes the femtosecond oscillator, the Offner stretcher, the regenerative amplifier, the pre-amplifier, the main am...
2005,
17.
Abstract:
A new method was used to design diffractive optical elements (DOE) based on improved iterative algorithm. This method shortened the computing time tremendously and the aberration factor of the design was about 8.4%. A DOE with 16 steps construction a...
A new method was used to design diffractive optical elements (DOE) based on improved iterative algorithm. This method shortened the computing time tremendously and the aberration factor of the design was about 8.4%. A DOE with 16 steps construction a...
2005,
17.
Abstract:
Pulse shaping of KrF laser by pulse stacking was experimentally studied. Compressed pulses by stimulated Brillouin scattering, short pulses with pulse-widths of 3~5 ns were gained. Shaped pulses with pulse-widths of 10~15 ns, flat-top-widths of 5~10 ...
Pulse shaping of KrF laser by pulse stacking was experimentally studied. Compressed pulses by stimulated Brillouin scattering, short pulses with pulse-widths of 3~5 ns were gained. Shaped pulses with pulse-widths of 10~15 ns, flat-top-widths of 5~10 ...
2005,
17.
Abstract:
A group of amorphous CHN films were fabricated successfully by hollow cathode plasma chemical vapor deposition with ammonia, hydrogen and methane as reacting gas. The variation of deposition rate as a function of DC voltage and reactive gas flows wer...
A group of amorphous CHN films were fabricated successfully by hollow cathode plasma chemical vapor deposition with ammonia, hydrogen and methane as reacting gas. The variation of deposition rate as a function of DC voltage and reactive gas flows wer...
2005,
17.
Abstract:
In this paper, the Al target in ICF experiment was produced by single point diamond turning technology. The effect of turning process on the surface roughness of Al target was discussed. The experiment results have demonstrated that lower surface rou...
In this paper, the Al target in ICF experiment was produced by single point diamond turning technology. The effect of turning process on the surface roughness of Al target was discussed. The experiment results have demonstrated that lower surface rou...
2005,
17.
Abstract:
In the SBS (stimulated Brillouin scattering) amplifier the focused Gaussian beams of 1.064 μm and 0.532 μm were used as pump lasers and SBS characteristics in different medium were simulated. Through study of SBS amplifier of self-Stokes-seeding, it ...
In the SBS (stimulated Brillouin scattering) amplifier the focused Gaussian beams of 1.064 μm and 0.532 μm were used as pump lasers and SBS characteristics in different medium were simulated. Through study of SBS amplifier of self-Stokes-seeding, it ...
2005,
17.
Abstract:
The characteristics of the forward hot electrons produced by 20 TW p-polarized picosecond laser-plasma interactions are studied at laser intensities from subrelativistic to relativistic. The spatial distribution of forward hot electrons is multi-peak...
The characteristics of the forward hot electrons produced by 20 TW p-polarized picosecond laser-plasma interactions are studied at laser intensities from subrelativistic to relativistic. The spatial distribution of forward hot electrons is multi-peak...
2005,
17.
Abstract:
The method of orthogonal experiment was used to study the influences caused by pressure, pressure-holding time, annealing temperature and annealing time on properties of nanocrystalline Cu produced by flow-levitation-cold press process. XRD, microhar...
The method of orthogonal experiment was used to study the influences caused by pressure, pressure-holding time, annealing temperature and annealing time on properties of nanocrystalline Cu produced by flow-levitation-cold press process. XRD, microhar...
2005,
17.
Abstract:
A function about the magnetic force of ICF targets in the levitation magnetic field was proposed using the principle of levitation, and a theoretics model about the target levitation was established. Experimental and theoretical results show that whe...
A function about the magnetic force of ICF targets in the levitation magnetic field was proposed using the principle of levitation, and a theoretics model about the target levitation was established. Experimental and theoretical results show that whe...
2005,
17.
Abstract:
Hydroquinone-formaldehyde organic aerogels with high HC ratio(10~40, molar ratio of hydroquinone to catalyst) have been prepared using sol-gel process. And carbon aerogels have been prepared by pyrolyzing the aerogels. In addition, the ingredients ha...
Hydroquinone-formaldehyde organic aerogels with high HC ratio(10~40, molar ratio of hydroquinone to catalyst) have been prepared using sol-gel process. And carbon aerogels have been prepared by pyrolyzing the aerogels. In addition, the ingredients ha...
2005,
17.
Abstract:
Helical array antenna is fed from a single-layered radial waveguide to realize the directional radiation of high-power microwave. Low-profile helix is used as a radiation element. The feed wire of each helix is connected with an H-coupled probe, and ...
Helical array antenna is fed from a single-layered radial waveguide to realize the directional radiation of high-power microwave. Low-profile helix is used as a radiation element. The feed wire of each helix is connected with an H-coupled probe, and ...
2005,
17.
Abstract:
The response of a short single-wire line excited by EMP was theoretically investigated and experimentally validated by means of an EMP simulator. A modified bounded-wave EMP simulator was developed with a rise time less than 5 ns and pulse width abou...
The response of a short single-wire line excited by EMP was theoretically investigated and experimentally validated by means of an EMP simulator. A modified bounded-wave EMP simulator was developed with a rise time less than 5 ns and pulse width abou...
2005,
17.
Abstract:
The electron beams produced by the needle-shaped annular carbon fiber-coated cathode soaked with cesium iodide (CsI) salt and annular stainless steel cathode were separately used to bombard the nylon targets. There was a uniform round mark on the tar...
The electron beams produced by the needle-shaped annular carbon fiber-coated cathode soaked with cesium iodide (CsI) salt and annular stainless steel cathode were separately used to bombard the nylon targets. There was a uniform round mark on the tar...
2005,
17.
Abstract:
In order to study the voltage distribution on the pulse transformer's conical windings, according to the structure of the actual pulse transformer's taper windings, the finite element model and equivalent circuit were built based on the multi-conduct...
In order to study the voltage distribution on the pulse transformer's conical windings, according to the structure of the actual pulse transformer's taper windings, the finite element model and equivalent circuit were built based on the multi-conduct...
2005,
17.
Abstract:
A new idea about radial reflex klystron oscillator with a virtual cathode is brought forward to improve microwave power and efficiency. The radial reflex klystron oscillator is combined with a virtual cathode oscillator in one foldaway coaxial diode....
A new idea about radial reflex klystron oscillator with a virtual cathode is brought forward to improve microwave power and efficiency. The radial reflex klystron oscillator is combined with a virtual cathode oscillator in one foldaway coaxial diode....
2005,
17.
Abstract:
This paper presents the design of 2-cell Tesla type cavity and the properties of higher order modes (HOMs) of 2-cell cavity simulated by HFSS process, including the tuning frequency, the quality factor, the shunt impedance and the distribution of the...
This paper presents the design of 2-cell Tesla type cavity and the properties of higher order modes (HOMs) of 2-cell cavity simulated by HFSS process, including the tuning frequency, the quality factor, the shunt impedance and the distribution of the...
2005,
17.
Abstract:
The present condition of technique research on generation of intense pulsed super-hard X-ray via bremsstrahlung of pulsed intense-current pinched electron beam was described. The characteristics of a few main techniques to generate intense pulsed sup...
The present condition of technique research on generation of intense pulsed super-hard X-ray via bremsstrahlung of pulsed intense-current pinched electron beam was described. The characteristics of a few main techniques to generate intense pulsed sup...
2005,
17.
Abstract:
A lower prepulse high power density water dielectric self-breaking switch was investigated on FlashⅡgenerator. The switch contained two or four gaps, a prepulse shield and supporting structure. The discharge current and the input or output voltages o...
A lower prepulse high power density water dielectric self-breaking switch was investigated on FlashⅡgenerator. The switch contained two or four gaps, a prepulse shield and supporting structure. The discharge current and the input or output voltages o...
2005,
17.
Abstract:
The experimental setup used to synthesize metal oxide nanopowders by electrical explosion of wires (EEW) was designed. Al2O3 nanopowders were synthesized successfully. The average size of the nanoparticle was 64.9 nm. Physical conditions for producin...
The experimental setup used to synthesize metal oxide nanopowders by electrical explosion of wires (EEW) was designed. Al2O3 nanopowders were synthesized successfully. The average size of the nanoparticle was 64.9 nm. Physical conditions for producin...
2005,
17.
Abstract:
It's an essential step for the commissioning of electron-positron collider to realize the absolute collision of electron and positron beams at the interaction point. The relative transverse offset between electron and positron beams causes the beam-b...
It's an essential step for the commissioning of electron-positron collider to realize the absolute collision of electron and positron beams at the interaction point. The relative transverse offset between electron and positron beams causes the beam-b...
2005,
17.
Abstract:
A monitoring and control system for 4 MeV electron linear induction accelerator capable of producing beams in burst mode is presented. The system is a distributed one based on local network using DataSocket. The hardware using FP2000 distributed I/O ...
A monitoring and control system for 4 MeV electron linear induction accelerator capable of producing beams in burst mode is presented. The system is a distributed one based on local network using DataSocket. The hardware using FP2000 distributed I/O ...
