菲涅耳数 meaning in English

fresnel number

Large - fresnel - number optical resonator
大菲涅耳数光学共振器
Numerical calculations are performed to show the dependence of intensity distribution on the fresenl number and obscure ratio
数值计算例表明，光强分布与菲涅耳数和遮拦比有关。
Such conclusion is given : shorten the fresnel shu , shorten the obscuration ’ s area percent and shorten the equivalent diffraction distances will improve the optical quality . ( 4 ) the nonlinear paraxial equation is understood to analyze the n slabs ’ hot - image rule
得出在高功率固体激光装置中应缩小散射点的菲涅耳数和散射面积比,控制散射点的等效衍射距离,使散射点接近等效衍射距离为零,即像面的位置。
The main results of this thesis can be summarized as follows : 1 . based on the huygens - fresnel principle , we have derived the propagation expressions of the partially coherent beams passing through an annular lens optical system . the influence of the spectral degree of coherence , fresnel number and truncated parameter on the focused intensity distribution and focal shift is analyzed
主要工作包括: 1 .从惠更斯-菲涅耳原理出发,推导了部分相干光束通过环形透镜系统的传输公式,分析了空间相干度、菲涅耳数、拦截系数对系统中光束的聚焦光强和焦移的影响。