The concept of Fresnel number is also discussed.
并对菲涅耳数这一物理概念进行了论述。
The number of spectral switch increases with increasing Fresnel number and truncation parameter, but.
数值计算结果表明，光谱开关主要与截断参量、光束菲涅耳数以及光谱相干度有关。
Finally we extend the Fresnel number to the region of complex number, and use it to investigate the diffraction problem of a truncated Gaussian beam.
最后，把菲涅耳数推广到复数域，并用于研究截断高斯光束的衍射问题。
The number of spectral switch increases with increasing Fresnel number and truncation parameter, but decreases with increasing spectral degree of coherence.
光谱开关的个数随着光束菲涅耳数以及截断参量的增大将增多，而随光谱相干度的增大而减少。
The mode discrimination and loss characteristics of unstable optical resonators with higher Fresnel number are analysed using theories of geometric-optics and interferometer.
采用几何光学和干涉仪理论，分析了较大菲涅尔数情况下，非稳腔内不同波型的区分方法以及它们彼此间的损耗率差异；
The relations between the Fresnel number of a Gaussian beam and the parameters of the focusing Gaussian beam are analysed in this paper. And a simple method of design is given.
本文分析高斯光束菲涅耳数和聚焦高斯光束各参数之间的关系，给出了一种简便的设计方法。
The analysis that the size of the focal shift is related to the factors such as Fresnel number, separating degree of lens-diaphragm and curvature radius of incident wave wavefront, etc.
分析表明，焦移的大小与菲涅尔数、透镜-光阑的分离程度以及入射波波面曲率半径等因素有关，并得出了消除焦移的条件。
Numerical calculations are performed and show that the focal shift in focused sinhGaussian beams depends on the Fresnel number and decentered parameter, and increases with decreasing them.
数值计算表明，聚焦双曲正弦高斯光束的焦移与偏心参数和菲涅耳数有关，焦移随偏心参数和菲涅耳数的减小而增大。
In order to analyze a circular confocal resonator with a big Fresnel number, in this paper, we introduce a transfer matrix method to calculate and analyze the modes in a confocal resonator.
为了分析具有大菲涅尔数的圆镜共焦腔，本文利用传输矩阵方法对腔模进行计算和讨论。
In order to analyze a circular confocal resonator with a big Fresnel number, in this paper, we introduce a transfer matrix method to calculate and analyze the modes in a confocal resonator.
为了分析具有大菲涅尔数的圆镜共焦腔，本文利用传输矩阵方法对腔模进行计算和讨论。
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