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? 2ID*U d*
以下是我的ASAP代码,可以拷贝运行一下。 4eDmLC"Y
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SYSTEM NEW j3sz*:
RESET ^?sSsHz
1[fkXO{
UNITS MM I{*.htt{
WAVELENGTHS 3.7 UM kx;xO>dC
sK""
COATING PROPERTIES E.zYi7YUKK
1 0 'REFLECT' K#m\qitb
0 0 'ABSORB' Xy3g(x]
qY*%p
PARABASAL 4 IL8'{<lM
BEAMS COHERENT DIFFRACT \S|VkPv
WIDTHS 1.6 YG}p$\R
(FjsN5
A=1 Kd AR)EU>
N=32 =DmPPl{
L=(N)*(A) )sY$\^'WY
D1=0.625E-3 MIk #60Ab
D2=(N)*(D1) eY6gb!5u
!! 微阶梯镜======================= $w";*">:0
$DO -16 15 1 kp#c:ym
{SURFACE ?h>%Ix
PLANE Z 0 RECTANGLE (A)/2 (L)/2 dcrJ,>i}
OBJECT 'MIRROR2_?' ;ZE<6;#3IP
INTERFACE COATING REFLECT AIR AIR Ca`/ t8=
SHIFT X (A)*?+(A)/2 lyOrM7Gs
SHIFT Z (D2)*? eJVOVPg<,
} Muc*?wB`
GROUP MIRROR2_? {$u@6&
B
SHIFT Z (L) VfE^g\Ia
ROTATE X -90 0 0 Zo}\gg3
!! DETECTOR====================== Ue>A
SURFACE )P(d66yq'u
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 }{w_>!ee
OBJECT 'DETECTOR' ^}Dv$\;6
INTERFACE COATING ABSORB AIR AIR LzEE]i
!! SOURCE ======================= $+)x)1
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) {_k!!p6
SOURCE DIR 0 1 0 6"rFfdns
!! !!TRACE PLOT========================= !kHyLEV
!!WINDOW Y Z #IL~0t
!!PLOT FACETS 5 5 !!OVERLAY ([4{n
TRACE!! PLOT CpP$HrQ
!!$VIEW ]>S$R&a
]mJAKycE%
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY AIRVvW~($
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 B#Oc8`1Y
PIXELS (256) ui#1 +p3G
SPREAD NORMAL [jtj~]&mO
DISPLAY 3Oig/KZ
!! FORM 0.5 6&xW9' 6b:
PICTURE =-1^K
RETURN