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？ Dg];(c+/
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 .j ]OO/,
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SYSTEM NEW HquB*=^xh
RESET e{#a{`?Uez
O_%PBgcJr
UNITS MM xhp-4
WAVELENGTHS 3.7 UM ft. }$8vIT
GwU>o:g"
COATING PROPERTIES U- U V<}
1 0 'REFLECT' ^`B##9g~
0 0 'ABSORB' MSrY*)n!>O
yScov)dp(
PARABASAL 4 OL6x MToP
BEAMS COHERENT DIFFRACT 1zEZ \G
WIDTHS 1.6 u"
NIG
g) | ++?
A=1 5;i!PuL
N=32 HK,G8:T
L=(N)*(A) %I2xK.8 =
D1=0.625E-3 el*pYI
D2=(N)*(D1) &>wce 5uV
!! 微阶梯镜======================= 7T(OV<q;#
$DO -16 15 1 j@_) F^12
{SURFACE ^|hRu{Q W
PLANE Z 0 RECTANGLE (A)/2 (L)/2 zi DlJ3]^
OBJECT 'MIRROR2_?' o\ :f9JL
INTERFACE COATING REFLECT AIR AIR s poWdRM2
SHIFT X (A)*?+(A)/2 ,VcD vZ7
SHIFT Z (D2)*? VTgbJ {?
} "3>* i!i
GROUP MIRROR2_? 0q V*d
SHIFT Z (L) o- e,
ROTATE X -90 0 0 TF iM[
!! DETECTOR====================== J#OE}xASoA
SURFACE zL!~,B8C
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 ^J}$y7
OBJECT 'DETECTOR' h/+I-],RF
INTERFACE COATING ABSORB AIR AIR ,B/p1^;.
!! SOURCE ======================= "!_
4%z-
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) F~rY jAFTi
SOURCE DIR 0 1 0 Gk] qE]hi
!! !!TRACE PLOT========================= ;
K
6Fe)
!!WINDOW Y Z :Kc0ak)<n
!!PLOT FACETS 5 5 !!OVERLAY gp&&
c,
TRACE!! PLOT UC
LjR<}
!!$VIEW Ev |{~U
E{]|jPdr
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY _2Xu1q.6~5
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 {@F["YPxy
PIXELS (256) r(2'0JQ
SPREAD NORMAL j?KB8oY`TP
DISPLAY i11GW
!! FORM 0.5 '?>O
PICTURE "qP^uno
RETURN
