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? 8fM}UZI
以下是我的ASAP代码,可以拷贝运行一下。 T|.Q81.NE
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SYSTEM NEW `8FC&%X_
RESET &K>]!yn
9^a>U(,
UNITS MM 2Fx<QRz
WAVELENGTHS 3.7 UM }#'KME4
m9G,%]4|
COATING PROPERTIES sTG+c E
1 0 'REFLECT' "fpj"lf-
0 0 'ABSORB' $elrX-(vL
l7s=b4}c
PARABASAL 4 c6c^9*,V
BEAMS COHERENT DIFFRACT OM4s.BLY
WIDTHS 1.6 9Biw!%a
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A=1 c4-&I"z
N=32 J~_p2TZJ\3
L=(N)*(A) .qK=lHxT
D1=0.625E-3 xZ@Y`2A':
D2=(N)*(D1) IN%>46e`
!! 微阶梯镜======================= &us8,x6yg
$DO -16 15 1 $--PA$H27
{SURFACE E*w 2yWR
PLANE Z 0 RECTANGLE (A)/2 (L)/2 awkVjyq X
OBJECT 'MIRROR2_?' V)@MM2,
INTERFACE COATING REFLECT AIR AIR 8fe"#^"s R
SHIFT X (A)*?+(A)/2 ^1~/FU
SHIFT Z (D2)*? q #p)E=$
} ) F~>
GROUP MIRROR2_? Ec\x;li! *
SHIFT Z (L) \s+MHa&
ROTATE X -90 0 0 tLvli>y@
!! DETECTOR====================== /ruf1?\,R
SURFACE ;! 9_5Ar%
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 `PW=_f={
OBJECT 'DETECTOR' z=K5~nU
INTERFACE COATING ABSORB AIR AIR 3?O|X+$p
!! SOURCE ======================= iit`'}+U
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) E{fnh50^Q.
SOURCE DIR 0 1 0 4O`h%`M
!! !!TRACE PLOT========================= *
QR7t:([
!!WINDOW Y Z e`~q;?:
!!PLOT FACETS 5 5 !!OVERLAY Rke:*(p*n;
TRACE!! PLOT RyhR#
!!$VIEW b?Jm)
O#EBR<CuK
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY \6'A^cE/PX
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 ]rN fr-
PIXELS (256) >WDpBn:
SPREAD NORMAL uc<@
Fh(
DISPLAY b>7ts_b
!! FORM 0.5 19rUvgC{M
PICTURE F0JFx$AoD
RETURN