[求助]用ASAP高斯光束分解的方法遇到的问题 [复制链接]

各位光学专业的大神，我最近在用ASAP对微阶梯反射镜（如附图）进行模拟。一束单色平行光垂直入射到微阶梯反射镜上，用探测器接收反射光。如图，理论上在探测器上应该也是均匀的光场，但是用ＡＳＡＰ的高斯光束分解模拟得到的结果却如图所示。这是为什么呢？ )6R#k8'ERr  
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 1q233QSW)  
F+y`4>x  
SYSTEM NEW 53+rpU_  
RESET (R*jt,x  
g(Xg%&@KZ  
UNITS MM r5qx! >  
WAVELENGTHS 3.7 UM rs<&x(=Hv  
W0T i ^@  
COATING PROPERTIES y>cmKE  
  1 0 'REFLECT' [Fj#7VZK  
  0 0 'ABSORB' B[_bJ *  
Z2j*%/  
PARABASAL 4 3(GrDO9^  
BEAMS COHERENT DIFFRACT .s*EV!SE  
WIDTHS 1.6 >=W#z  
a&c#* 9t{  
A=1    T[[  
N=32   .rB;zA;4S)  
L=(N)*(A)   P$qkb|D,  
D1=0.625E-3     Qu>zO!x  
D2=(N)*(D1) &eS70hq  
!! 微阶梯镜======================= *_K-T#  
$DO -16 15 1 dUtIAh-j  
{SURFACE \lakT_x  
   PLANE Z 0 RECTANGLE (A)/2 (L)/2 wukos5  
OBJECT 'MIRROR2_?' 9-iB?a7{.  
   INTERFACE COATING REFLECT AIR AIR   ~q|e];tA  
   SHIFT X (A)*?+(A)/2 pBnf^Ew1  
   SHIFT Z (D2)*?   j.N
\U#3KK  
}   3XlnI:w=  
GROUP MIRROR2_? *|#JFy?c[  
  SHIFT Z (L) v9`B.(Ru  
  ROTATE X -90 0 0   a<"& RnG(  
!! DETECTOR======================   _xL&sy09t  
SURFACE /FV6lR!0^  
  PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 vrnj}f[h  
OBJECT 'DETECTOR' Yg,lJ!q  
  INTERFACE COATING ABSORB AIR AIR   ow$l!8  
!! SOURCE ======================= 9}0Jc(B/x  
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) M-K@n$k  
  SOURCE DIR 0 1 0 5a|m}2IX  
!! !!TRACE PLOT========================= !
=:MG#p  
!!WINDOW Y Z jLS]^|  
!!PLOT FACETS 5 5 !!OVERLAY :h^UC~[h 3  
TRACE!! PLOT kDP^[V P+  
!!$VIEW   BCZnF /Zo  
AG\852`1m  
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY -&D6w9w  
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2   ,zw=&)W1  
PIXELS (256) $5CY<,f  
SPREAD NORMAL SWO!E  
DISPLAY vfTG*jG  
!!  FORM 0.5 !3Z|!JY  
  PICTURE >
37}JUG  
RETURN

Since you use the coherence switch, the edge might diffract the gaussian beam and those diffracted beams interfer with your other beams to give out the interference pattern.

好吧，过了这么久都没人回。

有谁知道吗？急啊。