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? w$fP$ \+
以下是我的ASAP代码,可以拷贝运行一下。 HQ0fY
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SYSTEM NEW TDY2
M
RESET %j4AX
:`X!no; {
UNITS MM ]hHL[hoFC
WAVELENGTHS 3.7 UM sk>E(Myo
@4FG&
>kQ
COATING PROPERTIES ^V;h>X|
1 0 'REFLECT' =_)yV0
0 0 'ABSORB' lHI;fR
A^3M~
PARABASAL 4 ?BA~$|lfxu
BEAMS COHERENT DIFFRACT Z!eW_""wp
WIDTHS 1.6 /$Ca}>
YQ
_]Jv k
A=1 I|eYeJ3
N=32 XhEJF !
L=(N)*(A) [!'fE#"a
D1=0.625E-3 ,)beK*Iw
D2=(N)*(D1) Yn+d!w<3:
!! 微阶梯镜======================= Xub<U>e;b
$DO -16 15 1 Z6\H4,k&
{SURFACE q1_iV.G<
PLANE Z 0 RECTANGLE (A)/2 (L)/2 appWq}db
OBJECT 'MIRROR2_?' .d?2Kc)SV\
INTERFACE COATING REFLECT AIR AIR 57~/QEdy
SHIFT X (A)*?+(A)/2 gi#g)9HG
SHIFT Z (D2)*? DYej<T'?3
} `"RT(` m
GROUP MIRROR2_? 2T&n6t$p
SHIFT Z (L) zg+6<
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ROTATE X -90 0 0 U,7O{YM
!! DETECTOR====================== Nay&cOz
SURFACE 5!V%0EQqw
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 FofeQ
OBJECT 'DETECTOR' nd3n 'b
INTERFACE COATING ABSORB AIR AIR ve&"x Nz<
!! SOURCE ======================= )0UXTyw^
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) *i,@d&J y]
SOURCE DIR 0 1 0 BH3%dh:9
!! !!TRACE PLOT========================= EgB$y"fs
!!WINDOW Y Z e,8[fp-7
!!PLOT FACETS 5 5 !!OVERLAY 8lZB3p]X
TRACE!! PLOT -)E
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!!$VIEW /O{iL:`
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CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY /kH
7I
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 1ww#]p`1
PIXELS (256) J2avt
SPREAD NORMAL 5!jU i9
DISPLAY 0hv}*NYd
!! FORM 0.5 a,`f`;\7N%
PICTURE =tQ^t4_
RETURN