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？ @aC9O 9|~
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 vT {+Z\LL=
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SYSTEM NEW
i38` 2
RESET
\<u
,TlYQ/j%h
UNITS MM W!o|0u!D
WAVELENGTHS 3.7 UM 1%$Z%?
PR3&LI;B*
COATING PROPERTIES 8s9ZY4_
1 0 'REFLECT' t->I# t7
0 0 'ABSORB' 4o3TW#
mkuK$Mj
PARABASAL 4 yN{TcX
BEAMS COHERENT DIFFRACT 7fXta|eP0
WIDTHS 1.6 pB:/oHV
F S!D
A=1 Y|nC_7&Bv
N=32 tRVz4fk[G
L=(N)*(A) `DS7J\c$
D1=0.625E-3 ngOGo =
D2=(N)*(D1) P^^WViVX
!! 微阶梯镜======================= ((AIrE>Rr
$DO -16 15 1 4vJg"*?
{SURFACE L/xTW
PLANE Z 0 RECTANGLE (A)/2 (L)/2 }!QVcu"+t/
OBJECT 'MIRROR2_?' NnRX 0]
INTERFACE COATING REFLECT AIR AIR 5kLz8n^z@@
SHIFT X (A)*?+(A)/2 :YCB23368"
SHIFT Z (D2)*? -8 Q}*Z
} k"F \4M
GROUP MIRROR2_? trz &]v=:
SHIFT Z (L) Cs'<;|r(
ROTATE X -90 0 0 V.}3d,Em%]
!! DETECTOR====================== KD`*[.tT
SURFACE Y2aN<>f
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 [w{x+ 6uX'
OBJECT 'DETECTOR' cvVv-L<[S`
INTERFACE COATING ABSORB AIR AIR jidRh}>a=
!! SOURCE ======================= V /]o':
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) SNc $!
SOURCE DIR 0 1 0 88On{Kk.v
!! !!TRACE PLOT========================= yY_#fJj
!!WINDOW Y Z h9kwyhd"
!!PLOT FACETS 5 5 !!OVERLAY \p#_D|s/Ep
TRACE!! PLOT u;9a/RI
!!$VIEW n;LjKE
a5?Yh<cJ
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY J1Run0
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 m,)o&ix1
PIXELS (256) g\1|<jb3
SPREAD NORMAL uj@ d {AQ
DISPLAY CU@}{}Yl
!! FORM 0.5 Ch_eK^ g1
PICTURE IXpn(vX
RETURN
