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RSS1996 Vol. 20, No. 5
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1996, 20(5): 257-262.
[Abstract]
[PDF 1294KB]
Abstract:
This paper firstly outlines the policy and the emphasis for the development of American DOD high power laser weapons.Then we analyze and evaluate the essential characteristics,status,programs and technical courses as well as the unresolved key technological problems being developed five high power laser weapons of American.
This paper firstly outlines the policy and the emphasis for the development of American DOD high power laser weapons.Then we analyze and evaluate the essential characteristics,status,programs and technical courses as well as the unresolved key technological problems being developed five high power laser weapons of American.
1996, 20(5): 263-266.
Abstract:
In order to obtain the homogeneity of pulse discharge at the high pressure,a X-ray preionization source for excimer lasers is introduced in this paper.The X-ray results from the impact of accelerated electrons against a Tatarget.The shorter the wavelength of X-ray is,the ability of the preionization is much stronger.With the X-ray preionization source,the preionization electrons density of 2.9×108cm-3 can be obtained in He:Xe:Fe mixed gas atmosphere.
In order to obtain the homogeneity of pulse discharge at the high pressure,a X-ray preionization source for excimer lasers is introduced in this paper.The X-ray results from the impact of accelerated electrons against a Tatarget.The shorter the wavelength of X-ray is,the ability of the preionization is much stronger.With the X-ray preionization source,the preionization electrons density of 2.9×108cm-3 can be obtained in He:Xe:Fe mixed gas atmosphere.
1996, 20(5): 266-268.
Abstract:
This paper presented a method for measurement of radius of curvature of a cylindrical lens. While a laser beam goes through a cylindrical lens, the divergent angle width can be precisely determined with a high resolution CCD and a data microcomputer processing system. Then the radius of curvature of the cylindrical lens also can be calculated out. In practical application, measuring accuracy is high up to 2%.
This paper presented a method for measurement of radius of curvature of a cylindrical lens. While a laser beam goes through a cylindrical lens, the divergent angle width can be precisely determined with a high resolution CCD and a data microcomputer processing system. Then the radius of curvature of the cylindrical lens also can be calculated out. In practical application, measuring accuracy is high up to 2%.
1996, 20(5): 269-275.
Abstract:
A multipass ring resonator, that the all annula reflective surface of two ring mirrors can be decomposed into many ring resonators, is introduced in this paper. The analysis and theoretical calculation show that this resonator has better operation properties and output mode.
A multipass ring resonator, that the all annula reflective surface of two ring mirrors can be decomposed into many ring resonators, is introduced in this paper. The analysis and theoretical calculation show that this resonator has better operation properties and output mode.
1996, 20(5): 276-280.
Abstract:
This monograph is divided into two parts.In part I,based on the Fourier Opties method,detailed analytical and numerical calculations have been carried out to elucidate the performance properties and some problems concerning the practical design of the temporal-spatial pulse shaping system.
This monograph is divided into two parts.In part I,based on the Fourier Opties method,detailed analytical and numerical calculations have been carried out to elucidate the performance properties and some problems concerning the practical design of the temporal-spatial pulse shaping system.
1996, 20(5): 281-284.
Abstract:
In this paper,the control technique of optical chaos,also called the period windows technique, with the relative technique of searching and locating of the period windows is presented explicitly to solve the usual difficulty of looking for the period windows in experiment.The period windows controlling technique can be easily used in optical system for chaos control,especially in the higher output,low input system without any accessory device to get the non chaos output.In computer imitation experiment of the chaos control of optical second harmonic output,the strong period second harmonic output obtained.This fact shows that this technique is much better than usual method.
In this paper,the control technique of optical chaos,also called the period windows technique, with the relative technique of searching and locating of the period windows is presented explicitly to solve the usual difficulty of looking for the period windows in experiment.The period windows controlling technique can be easily used in optical system for chaos control,especially in the higher output,low input system without any accessory device to get the non chaos output.In computer imitation experiment of the chaos control of optical second harmonic output,the strong period second harmonic output obtained.This fact shows that this technique is much better than usual method.
1996, 20(5): 285-290.
Abstract:
In this paper, the numerical simulation for the pumping cavity used for multi-slab solid-state lasers (so called"optical stove") has been presented and analyzed by means of the two-dimensional ray tracing method, and the related experiment has been reported.The results obtained in this paper can be extended to the pumping cavity design of Nd:glass multi-segment amplifiers.
In this paper, the numerical simulation for the pumping cavity used for multi-slab solid-state lasers (so called"optical stove") has been presented and analyzed by means of the two-dimensional ray tracing method, and the related experiment has been reported.The results obtained in this paper can be extended to the pumping cavity design of Nd:glass multi-segment amplifiers.
1996, 20(5): 290-293.
Abstract:
In this paper the recent developments in high power diode pumped solid-state lasers and related technologies are reported and analyzed.
In this paper the recent developments in high power diode pumped solid-state lasers and related technologies are reported and analyzed.
Time spectrum characteristics of g(1)(τ) of double frequency Zeemen He-Ne laser and its applications
1996, 20(5): 294-298.
Abstract:
In terms of the typical structure in frequency spectrum of Zeemen He-Ne laser, a time-spectrum formula g1(τ) (the degree of first order temporal coherence) of the double frequency Zeemen laser is derived, considering of the longitudinal mode frequency drift. These research results show that:(1) because of the effect of line width, the time coherence g1(τ) has the variation of period τ0= 1/Δνolr,(2) the variation of time-spectrum of g1(τ) is relative to frequency drift of double frequency mode; (3) the time-spectrum characteristics of g1(τ) can be used in the measurements of the laser parameters or the frequency stabilization of the double frequency lasers.
In terms of the typical structure in frequency spectrum of Zeemen He-Ne laser, a time-spectrum formula g1(τ) (the degree of first order temporal coherence) of the double frequency Zeemen laser is derived, considering of the longitudinal mode frequency drift. These research results show that:(1) because of the effect of line width, the time coherence g1(τ) has the variation of period τ0= 1/Δνolr,(2) the variation of time-spectrum of g1(τ) is relative to frequency drift of double frequency mode; (3) the time-spectrum characteristics of g1(τ) can be used in the measurements of the laser parameters or the frequency stabilization of the double frequency lasers.
1996, 20(5): 298-300.
Abstract:
The principle of absolute distance measurement using a diode laser with current-induced frequency modulation is presented. The configuration of the interferometer is described. The experimental results show that the measurable range of the interferometer is 0.3 to 1.5 meter with accuracy of 0.1 to 0.3mm.
The principle of absolute distance measurement using a diode laser with current-induced frequency modulation is presented. The configuration of the interferometer is described. The experimental results show that the measurable range of the interferometer is 0.3 to 1.5 meter with accuracy of 0.1 to 0.3mm.
1996, 20(5): 301-304.
Abstract:
In conventional mode selection method, the mirrors often used in laser cavity. In this paper, a new method that the diffractive optical elements, such as the diffractive mirrors, are used to substitute the traditional spherical mirrors is introduced. According to spectrum theory, the function of mode selection of diffractive mirrors is analyzes. Experimental results show that the properly selecting the cavity length and the aperture of the diffractive mirrors can obtain the higher diffractive loss ratio of 1:430 between the fundamental mode and TEM01 mode.
In conventional mode selection method, the mirrors often used in laser cavity. In this paper, a new method that the diffractive optical elements, such as the diffractive mirrors, are used to substitute the traditional spherical mirrors is introduced. According to spectrum theory, the function of mode selection of diffractive mirrors is analyzes. Experimental results show that the properly selecting the cavity length and the aperture of the diffractive mirrors can obtain the higher diffractive loss ratio of 1:430 between the fundamental mode and TEM01 mode.
1996, 20(5): 304-307.
Abstract:
The parallel processing property of microlens arrays under coherent and incoherent illumination has been studied.Using this kind of property,parallel multichannel pattern recognition system has been structed.
The parallel processing property of microlens arrays under coherent and incoherent illumination has been studied.Using this kind of property,parallel multichannel pattern recognition system has been structed.
1996, 20(5): 308-312.
Abstract:
This paper analyses the fabrication errors of binary optical elements exerting an influence on diffraction efficiency through amplitude vector analytics.In terms of the four level element,the analytical formula about the diffraction efficiency,aim error and the error of etching depth is deduced and discussed.This method has the universal sense for 2n-level binary optical elements.
This paper analyses the fabrication errors of binary optical elements exerting an influence on diffraction efficiency through amplitude vector analytics.In terms of the four level element,the analytical formula about the diffraction efficiency,aim error and the error of etching depth is deduced and discussed.This method has the universal sense for 2n-level binary optical elements.
1996, 20(5): 312-316.
Abstract:
The paper systematically summarizes the four kinds of characteristic signals as acoustics,light,electricity,heat etc.,for laser induced plasma in high power laser beam welding,also summarizes the overseas experimental methods and research status on detection of plasma signals,at last, analyses the future development in this respect.
The paper systematically summarizes the four kinds of characteristic signals as acoustics,light,electricity,heat etc.,for laser induced plasma in high power laser beam welding,also summarizes the overseas experimental methods and research status on detection of plasma signals,at last, analyses the future development in this respect.
1996, 20(5): 317-321.
Abstract:
Optical guidings in Raman FELs are studied theoretically and calculated in this papers.We have performed a two-dimensional program(FELOG),which is used to study optical guidings without and with wave guide constructions.The numerical simulations include optical field forfile,opitcal field radius,filling factor,and equivalent index of refraction,etc.The simualated results from experimental parameters agree with experimental results well.And the factors that affect optical guidings are analysed and discussed.
Optical guidings in Raman FELs are studied theoretically and calculated in this papers.We have performed a two-dimensional program(FELOG),which is used to study optical guidings without and with wave guide constructions.The numerical simulations include optical field forfile,opitcal field radius,filling factor,and equivalent index of refraction,etc.The simualated results from experimental parameters agree with experimental results well.And the factors that affect optical guidings are analysed and discussed.
