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？ )`B
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以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 {3{cU#\QA
ui$JQ _P
SYSTEM NEW K aGG4?=V
RESET ,Kw]V %xOb
+{F2h EYP
UNITS MM a= *qsgPGL
WAVELENGTHS 3.7 UM 7xr@$-U
m z kv/
COATING PROPERTIES ,
e6 }p
1 0 'REFLECT' [TFd|ywn
0 0 'ABSORB' !? u{2 D
mqFo`Ee
PARABASAL 4 l[D5JnWxt
BEAMS COHERENT DIFFRACT C_~hX G
WIDTHS 1.6 +^\TG>le
1<ic
5kB
A=1 e dv &!
N=32 uO,9h0y0W
L=(N)*(A) j jLwHJ
D1=0.625E-3 $xl>YYEBMH
D2=(N)*(D1) cB ,l= /?
!! 微阶梯镜======================= [)E.T,fjMQ
$DO -16 15 1 9< $n'g
{SURFACE B< p -.tv
PLANE Z 0 RECTANGLE (A)/2 (L)/2 1ae,s{|
OBJECT 'MIRROR2_?' Cj6+zJ
INTERFACE COATING REFLECT AIR AIR 3w -0IP]<
SHIFT X (A)*?+(A)/2 v3`k?jAaI
SHIFT Z (D2)*? ;I^+u0ga
} r a 4$/@3n
GROUP MIRROR2_? I}S~,4
SHIFT Z (L) {-fhp@;
ROTATE X -90 0 0 v.Y?<=E+<d
!! DETECTOR====================== /P>t3E2c
SURFACE !iO%?nW;
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 ".Q``d&X
OBJECT 'DETECTOR' w#!^w N
INTERFACE COATING ABSORB AIR AIR i:coNK)4
!! SOURCE ======================= 7ZsBYP8%
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) ipThw p9
SOURCE DIR 0 1 0 *4 9lM;
!! !!TRACE PLOT========================= x&kM /z?/
!!WINDOW Y Z ;`f14Fb
!!PLOT FACETS 5 5 !!OVERLAY e2 X\ll
TRACE!! PLOT V oTnm
!!$VIEW t(R Jc
V4.&"0\n #
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY Z Vin+ z
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 H>qw@JiO!
PIXELS (256) ?b8 :
SPREAD NORMAL jrl'?`O
DISPLAY H`:2J8
!! FORM 0.5 ,@#)) 2<RK
PICTURE Duu)8ru
RETURN
