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? ~Jz6O U*z
以下是我的ASAP代码,可以拷贝运行一下。 CzEd8jeh7
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#
SYSTEM NEW E~oOKQ5W
RESET ]?[fsdAQW
BF{Y"8u$
UNITS MM d-dEQKI?;
WAVELENGTHS 3.7 UM 0:Ol7
9-*uPK]m9
COATING PROPERTIES >\3V a
1 0 'REFLECT' ZzT9j~
0 0 'ABSORB' p=}Nn(
@J`"[%U
PARABASAL 4 ,nDaqQ-C!!
BEAMS COHERENT DIFFRACT #4 pB@_
WIDTHS 1.6 TbW38\>.R
>I&5j/&}+
A=1 I9hK }D
N=32 %d<"l~<5;
L=(N)*(A) v^ VitLC
D1=0.625E-3 j#q-^h3H
D2=(N)*(D1) 0Z{ZO*rK
!! 微阶梯镜======================= B,epzI
$DO -16 15 1 ut7zVp<"
{SURFACE ^3L0w}#
PLANE Z 0 RECTANGLE (A)/2 (L)/2 SKsKPqz
OBJECT 'MIRROR2_?' N5b!.B x-w
INTERFACE COATING REFLECT AIR AIR j+
0I-p
SHIFT X (A)*?+(A)/2 A{D];pE`
SHIFT Z (D2)*? &FN.:_E
} j HJ`,#
GROUP MIRROR2_? Qn)a/w-
SHIFT Z (L) rCdu0 gYT
ROTATE X -90 0 0 y/ef>ZZ
!! DETECTOR======================
Qjv}$`M
SURFACE ZX./P0
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 338k?nHxv
OBJECT 'DETECTOR'
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INTERFACE COATING ABSORB AIR AIR zue~ce73J
!! SOURCE ======================= %aVq+kC h
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) -4{<=y?"a
SOURCE DIR 0 1 0 \n|EM@=eE
!! !!TRACE PLOT========================= 5uj?#)N
!!WINDOW Y Z H]Z$OpI
!!PLOT FACETS 5 5 !!OVERLAY 4)urU7[ &)
TRACE!! PLOT 8>in_h9
!!$VIEW Trz@~d/[,n
+*/Zu`kzX
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY #fn)k1
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 K/yxE|w<
PIXELS (256) :(*V?WI
SPREAD NORMAL )cMh0SGcM1
DISPLAY
&powy7rR
!! FORM 0.5 @>Km_Ax
PICTURE 68C%B9.b'
RETURN