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？ C$C>RYE?.
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 52#6uBe
8 qw{e`c
SYSTEM NEW ,~1k:>njY~
RESET ErJ@$&7
P*|=Z>%[0
UNITS MM emrA!<w!W
WAVELENGTHS 3.7 UM ZADMtsk
-oUNK}>
COATING PROPERTIES , u %V%
1 0 'REFLECT' ]W2#8:i
0 0 'ABSORB' +O9x8OPHW
GGcODjY>
PARABASAL 4 SRk!HuXh
BEAMS COHERENT DIFFRACT !'BXc%`x[
WIDTHS 1.6 HB }rpiB
@b^$h:H
A=1 7(tsmP
N=32 kMnG1K
L=(N)*(A) GU @#\3
D1=0.625E-3 f> ktv76
D2=(N)*(D1) >C6S2ISSz
!! 微阶梯镜======================= 9Sd?,z
$DO -16 15 1 <? !'
{SURFACE Q#qfuwz
PLANE Z 0 RECTANGLE (A)/2 (L)/2 yOKzw~;0 %
OBJECT 'MIRROR2_?' [v*q%Mi_
INTERFACE COATING REFLECT AIR AIR C3 f\E: D)
SHIFT X (A)*?+(A)/2 m0v .[61
SHIFT Z (D2)*? 6g" h}p\{S
} NqOX);'L0
GROUP MIRROR2_? ?f q!BV
SHIFT Z (L) S`FIb'J
ROTATE X -90 0 0 ZOa| lB (,
!! DETECTOR====================== B U??}{
SURFACE ~ |A0*
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 Kn@#5MC
rU
OBJECT 'DETECTOR' . 43cI(
INTERFACE COATING ABSORB AIR AIR 2/s42
FoG
!! SOURCE ======================= _FE uQ9E
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) ?H@<8Ra=3
SOURCE DIR 0 1 0 gVzIEE25
!! !!TRACE PLOT========================= R"P-+T=7M
!!WINDOW Y Z "uIaKb
!!PLOT FACETS 5 5 !!OVERLAY YMK ![ q-
TRACE!! PLOT '=Lpch2J
!!$VIEW Ow4(1eE_
( y.N-I,
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY {CBb^BP
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 LOfw
#+]d
PIXELS (256) j Tt9;?)
SPREAD NORMAL _ ~\ } fY
DISPLAY <n#X~}i)
!! FORM 0.5 l}VE8-XB
PICTURE id5 ` YA$
RETURN
