[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？ *f%uc  
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 eI8rnp(Ia  
%#xdD2oN  
SYSTEM NEW -}u=tiNG  
RESET WaY_{
)x  
hk =nXv2M  
UNITS MM 
F?UI8  
WAVELENGTHS 3.7 UM e6E{l  
6w3z&5DY|  
COATING PROPERTIES gnjh=anVX1  
  1 0 'REFLECT' /5qeNjI+2  
  0 0 'ABSORB' E+LAE/v@  
= GN1l[X  
PARABASAL 4 ftS^|%p  
BEAMS COHERENT DIFFRACT _4eSDO[h  
WIDTHS 1.6 \LYB% K}  
3uSj5+@q6  
A=1   : GVyY]qBU  
N=32   N/wUP  
L=(N)*(A)   T5* t~`bfU  
D1=0.625E-3     97 Oi}   
D2=(N)*(D1) bC_qoI<   
!! 微阶梯镜======================= tPv3nh  
$DO -16 15 1 /.54r/FN')  
{SURFACE i2. +E&3v  
   PLANE Z 0 RECTANGLE (A)/2 (L)/2  -&N^S?  
OBJECT 'MIRROR2_?' (x;Uy  
   INTERFACE COATING REFLECT AIR AIR   0rM'VgB  
   SHIFT X (A)*?+(A)/2 &I8Q'  
   SHIFT Z (D2)*?   EW$.,%b1  
}   <>=A6
 
GROUP MIRROR2_? Z~&$s  
  SHIFT Z (L) IUB#Vdx  
  ROTATE X -90 0 0   mGss9eZa  
!! DETECTOR======================   1k=w 9  
SURFACE 5<Ly^Na:  
  PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 7Cx*Ts$  
OBJECT 'DETECTOR' e"^ /xF
 
  INTERFACE COATING ABSORB AIR AIR   ^^q9+0@  
!! SOURCE ======================= &hTe-Es  
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) c[p>*FnP  
  SOURCE DIR 0 1 0 fN)A`>iP  
!! !!TRACE PLOT========================= 9%+Nzo(Fd  
!!WINDOW Y Z MHl ffj  
!!PLOT FACETS 5 5 !!OVERLAY ]]sy+$@~  
TRACE!! PLOT EES
GU(  
!!$VIEW   _/FpmnaY  
29a~B<e7s  
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY P
tt  
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2   47S1mxur  
PIXELS (256) A_h|f5  
SPREAD NORMAL 2O|jVGap5x  
DISPLAY {RG4m{#9  
!!  FORM 0.5 ((& y:{?G  
  PICTURE Ijg//=  
RETURN

有谁知道吗？急啊。

好吧，过了这么久都没人回。

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.