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？ K'zG[[ P
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 !1\j D
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SYSTEM NEW hMiuv_EO !
RESET : 'LG%E:b
t,yz qn
UNITS MM >av.pJ(>
WAVELENGTHS 3.7 UM `e!hT@Xxa
W^^}-9
COATING PROPERTIES 0fT Eb%z8
1 0 'REFLECT' dnP3{!"b
0 0 'ABSORB' Qb;5:U/x
32sb$|eQq
PARABASAL 4 =':,oz^|
BEAMS COHERENT DIFFRACT dn1Tu6f;|
WIDTHS 1.6 HjF Y >(e
5vs o%}c
A=1 zjrr*i w
N=32 9#;UQ.qA
L=(N)*(A) rGe^$!QB
D1=0.625E-3 42m}c1R
D2=(N)*(D1) Nh[{B{k
!! 微阶梯镜======================= (Q$]X5L
$DO -16 15 1 .ZxH#l _
{SURFACE YTco;5/
PLANE Z 0 RECTANGLE (A)/2 (L)/2 ,j ('QvavJ
OBJECT 'MIRROR2_?' jnoFNIW
INTERFACE COATING REFLECT AIR AIR 0P_Y6w+
SHIFT X (A)*?+(A)/2 ,Wp0,>!
SHIFT Z (D2)*? zq5_&AeW
} Lz
VvUV k
GROUP MIRROR2_? ,QpDz {8
SHIFT Z (L) sKX%<n$
ROTATE X -90 0 0 !!c.cv'
!! DETECTOR====================== JAA P5ur
SURFACE `f:5w^A
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 C3 %, pDh
OBJECT 'DETECTOR' [^gSWU
INTERFACE COATING ABSORB AIR AIR pr-{/6j6
!! SOURCE ======================= JHf}LZu
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) (!';
SOURCE DIR 0 1 0 b* 6c.
!! !!TRACE PLOT========================= Lh &L5p7
!!WINDOW Y Z a<V=C
!!PLOT FACETS 5 5 !!OVERLAY omV.Qb'NS
TRACE!! PLOT Oz9k.[j(
!!$VIEW F|V co]"S1
YV 9*B
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY K@{jY\AZNx
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 qi7wr\XNW
PIXELS (256) zYOPE 6E
SPREAD NORMAL IBVP4&}x$
DISPLAY 0nAeeVz|
!! FORM 0.5 1F5F 2OT$8
PICTURE gzDb~UEoF
RETURN
