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 `+ITNV
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 Z~ uKT n
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SYSTEM NEW J
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RESET k$c
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UNITS MM V4-=Ni]k
WAVELENGTHS 3.7 UM P&GZe/6Y
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COATING PROPERTIES [1*/lt|+p
1 0 'REFLECT' *p3P\ H^5
0 0 'ABSORB' mQs$7t[>t
(2li:1j
PARABASAL 4 v2{O67j}
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BEAMS COHERENT DIFFRACT @NIypi$T
WIDTHS 1.6
SoX V
]cr; PRyv
A=1 (HI%C@ e9
N=32 ~Hs{(7
L=(N)*(A) ddP,_.0
D1=0.625E-3 2FzS_\":I
D2=(N)*(D1) w#T , g9
!! 微阶梯镜======================= PR?cl g=z
$DO -16 15 1 ='0!B]<G
{SURFACE _);Kb/
PLANE Z 0 RECTANGLE (A)/2 (L)/2 G!8pF
OBJECT 'MIRROR2_?' 1 =<| h
INTERFACE COATING REFLECT AIR AIR Y +GeT#VHe
SHIFT X (A)*?+(A)/2 f>dkT'4
SHIFT Z (D2)*? v I'> $
} _w;+Jh
GROUP MIRROR2_? dLf8w>i`T
SHIFT Z (L) fO^6q1a
ROTATE X -90 0 0 Bx- ,"Z \
!! DETECTOR====================== Aa>gN
SURFACE MPbPq3an
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 'I]"= O,
OBJECT 'DETECTOR' 3.X0!M;x
INTERFACE COATING ABSORB AIR AIR P@YL.'KU)
!! SOURCE ======================= Td*Oljj._U
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) .,Qnn}:l
SOURCE DIR 0 1 0 ?M M3LA! <
!! !!TRACE PLOT========================= UwkX [u
!!WINDOW Y Z <UJJ],)^1A
!!PLOT FACETS 5 5 !!OVERLAY JF%=Bc $C
TRACE!! PLOT (Fzh1#
!!$VIEW lM^!^6=v0l
^ ~qs- .?
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY WN +Jf
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 lmKq xs4
PIXELS (256) L5 9oh
SPREAD NORMAL =zeLs0s;
DISPLAY Us,[x Q
!! FORM 0.5 ;-pvc<_c<
PICTURE WWW#s gM%
RETURN
