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? xo.k:F
以下是我的ASAP代码,可以拷贝运行一下。 b uu /Nz$
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SYSTEM NEW i!i=6m.q7
RESET B4MrrW4=
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UNITS MM (~
`?_
WAVELENGTHS 3.7 UM <C <z#M'`
r^v1_u,1I
COATING PROPERTIES :?P>))vT%
1 0 'REFLECT' "sU jJ|
0 0 'ABSORB' AeR*79x
bn#'o(Lp
PARABASAL 4 =3dR-3
BEAMS COHERENT DIFFRACT )jPIBzMys
WIDTHS 1.6 ]k#iA9I
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A=1 kQw%Wpuq[/
N=32 M 3&GO5<
L=(N)*(A) )_a;xB`S(
D1=0.625E-3 ;W?mQUo:P8
D2=(N)*(D1) %}}?Y`/W)
!! 微阶梯镜======================= )&s9QBo{b
$DO -16 15 1 5kik+
{SURFACE `Fx+HIng,
PLANE Z 0 RECTANGLE (A)/2 (L)/2 QX+Xi<YE-
OBJECT 'MIRROR2_?' cw/E?0MWb
INTERFACE COATING REFLECT AIR AIR wA2^I70-
SHIFT X (A)*?+(A)/2 <
UD90}
SHIFT Z (D2)*? v];P| Fi
} GCj[ySCD
GROUP MIRROR2_? [:gp_Z&
SHIFT Z (L) MS`XhFPS.
ROTATE X -90 0 0 cb5T-'hY
!! DETECTOR====================== .x'?&7#(
SURFACE p|>m 2(|
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 nt_FqUJ
OBJECT 'DETECTOR' +yI2G!
$T9
INTERFACE COATING ABSORB AIR AIR >+9:31p
!! SOURCE ======================= 0WSOA[R%[b
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) ] B?NDxU
SOURCE DIR 0 1 0 8gxo{<,9
!! !!TRACE PLOT========================= 6&;h+;h
!!WINDOW Y Z V<ii
!!PLOT FACETS 5 5 !!OVERLAY _%wB*u,X
TRACE!! PLOT `Jj q5:\&
!!$VIEW ~X(2F#{<{
~5o2jTNy`p
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY :?j]W2+kR
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 9I [k3
PIXELS (256) fXSuJ<G
SPREAD NORMAL e^k)756
DISPLAY 3/ '5#$
!! FORM 0.5 @:}l a
PICTURE H5(:1
RETURN