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衍射调制     
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  diffraction modulation
     The Fast Hankel transformation algorithm has been used in studying the diffraction modulation porperity of laser beam propagation in high power laser facility in this paper.
     本文利用快速汉克尔变换算法研究了高功率激光束在自空间传输过程中形成低频调制对光束质量的影响 ,指出了衍射调制深度跟光束宽度及传输距离等参数之间的变化关系 .
短句来源
     The diffraction modulation of ultrashort pulsed-laser is less than that of CW laser, so only serrated aperture can be used to get uniform near-field uniform intensity distribution.
     和单色激光的衍射不同 ,宽带的飞秒光束衍射调制较小 ,直接利用锯齿光阑 ,便能获得近场光强分布相对均匀的光束
短句来源
  modulation diffraction
     Numerical study on modulation diffraction ring in linear medium
     线性介质中衍射调制环的数值研究
短句来源
     The modulation diffraction rings of a intense laser beam propagation in linear medium is investigated numerically by a two-dimensional fast Fourier transformation algorithm. The definition for Fresnal number in linear mediums is given on the basis of the properties of the diffraction rings land the relationship between the number of diffraction rings and Fresnal number is obtained.
     利用二维快速傅里叶变换算法研究了高功率激光在线性介质中传输形成低频调制的特性,根据这些调制特性给出了线性介质中Fresnel数的定义,并得到了线性介质中衍射调制环数跟Fresnel数的变化关系。
短句来源
  diffraction modulations
     Numerical calculations indicate that, in order to effectively suppress the diffraction modulations of intensity, it is necessary to choose the order n and half-width ws of super-Gaussian apertures (e.g. n=4, ws=0.4mm) properly.
     数值计算说明,为有效抑制光强的衍射调制,适当选取超高斯光阑的阶数n和半宽ws(如n=4,ws=0.4mm)是必要的。
短句来源
     Numerical results demonstrate the advantages of super-Gaussian and serrated apertures in suppressing Fresnel diffraction modulations and maintaining relatively large fill factor.
     数值计算结果表明,超高斯光阑和锯齿光阑的优点是能有效抑制菲涅尔衍射调制并有较大的填充因子。
短句来源
     If the aperture parameters are chosen appropriately, the serrated aperture will enable us to reduce the diffraction modulations of axial intensity in the region which we are interested in (F=20). Furthermore, the super-Gaussian aperture can suppress the diffraction modulations in the most of Fresnel region (F >3.7).
     结果表明,在选取合适的光阑参数情况下,锯齿光阑能减弱所关心区域(F=20)轴上光强的衍射调制,而超高斯光阑能抑制大部分菲涅耳区(F>3.7)的衍射调制
短句来源
     It is shown that,while maintaining a relatively large fill factor,the use of serrated apertures can suppress the diffraction modulations of axial intensity and reduce the nonuniformity of transversal intensity distributions.
     结果表明,锯齿光阑有较大的填充因子,能抑制轴上光强的衍射调制,并降低横向光强分布的不均匀性。
短句来源
  “衍射调制”译为未确定词的双语例句
     Diffraction Effect of Low-frequency Liquid Surface Wave and Computer Simulation of Surface Wave Shape Detection
     液体低频表面波的衍射调制效应及其表面波面形模拟检测
短句来源
     This article utilizes the non- contact optical technique, mainly studies the liquid low-frequency surface wave characteristic and has established the interference -diffraction modulation effect intensity distribution and the liquid surface wave relations.
     本文运用非接触式光学测量手段,研究液体低频表面波特性,发现了干涉一衍射调制效应,并得到了光强分布与液体表面波的解析关系。
短句来源
     Modulation effect of interference patterns was observed and appeared as the disappearance of interference fringe in company with the variation of SAW amplitude.
     改变表面声波振幅,进一步发现了干涉图样的衍射调制效应。 调制效应明显地表现为干涉条纹的缺级,并且随表面声波振幅变化。
短句来源
     The intensity distribution of light, interference fringe and its characters are analyzed and the angle width of the interference fringe range with SAW was derived by theory of wave optics under the action of modulation.
     依据波动光学原理,分析了衍射调制作用下光束干涉所产生的光强解析分布及条纹特征,得到了条纹角宽度与表面声波之间的解析关系,并据此对表面声波的特性参数波长和振幅及各级条纹相对光强分布规律进行了测定,实验结果与理论分析十分吻合。
短句来源
     Finally, the effect of the diffraction aperture is studied during the course of reducing the scale of the diffraction aperture to the limit of the scalar diffraction theory.
     继而讨论了缩小衍射孔径对SLM上光场分布和菲涅耳衍射调制函数的影响。
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  diffraction modulation
Effect of absorption on the ultrasonic diffraction modulation of light in a crystal
      
Diffraction modulation of electromagnetic radiation by ultrasound was discussed theoretically in [1-3] for an absorption-free anisotropic medium.
      
Diffraction modulation of optical radiation by controlled layered structures.
      
It is shown that efficient diffraction modulation of an optical signal can be obtained with the use of such media.
      
Diffraction modulation of optical radiation by layered structures.
      
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The features of Fresnel diffraction was fully characterized for the serratedaperture in this paper, we have proposed and demonstrated that modulated sinusoidalserrated apperture can effectively suppress the near-axis intensity ripples for a large scaleof Fresnel numbers. The design procedure was also given for its application in the highpowers laser systems.

详细研究了波纹光栏(serratedaperture)的菲涅耳衍射特征,提出并论证了调幅型正弦波纹光栏能在较大的菲涅耳数范围内有效地抑制光束中央部分的衍射调制,并给出这类波纹光栏用于高功率激光系统的设计程序。

The features of Fresnel diffraction are studied of the serrated aperture in this paper. We have proposed and demonstrated that using a serrated circular aperture and a spatial filter could effectively improve the light beam uniformity and suppress the intensity ripples for a large Fresnel numbers.

详细研究了波纹光阑的菲涅耳衍射特性,提出并论证了利用波纹光阑和空间滤波器的结合使用能进一步有效地改善光束近场分布、抑制光束总体的衍射调制、提高光束填充因子。

In order to improve the near field uniformity of the "SG Ⅱ"laser beam, we haveproposed and designed a special beam,called flat-top centered dip beam.The beam isgenerated by a combination of a hard edge serrated aperture and a spatial filter.In the paperthe calculated results and the inveStigated characteristics of the designed beam are alsogiven.

为改善“神光Ⅱ”驱动器光束的近场均匀性,提出并设计了特殊的空心平顶光束.以抑制衍射调制。光束的设计采用新颖的硬边波纹光阑截取和空间滤波器光滑化的方法.文中给出了理论计算结果并研究了所设计光束的基本特征.

 
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