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？ wm$1LZ8o-`
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 FOFZ/q
i+2fWi6Z+
SYSTEM NEW 5jTBPct
RESET S-^RZ"
>>ncq$
UNITS MM y3]7^+k
WAVELENGTHS 3.7 UM vT#$`M<
kXmnLxhS/
COATING PROPERTIES |,&5.|E 7
1 0 'REFLECT' $R '
0 0 'ABSORB' =lzRx%tm
ZZ<uiN$
PARABASAL 4 b#:Pl`n6u
BEAMS COHERENT DIFFRACT rHir>
p
WIDTHS 1.6 ]ZQ3|ZJ?<
o Q!56\R
A=1 N6"b
Ox J(
N=32 aIrQ=}
L=(N)*(A) v[r5!, F
D1=0.625E-3 FY^[?lj
D2=(N)*(D1) (o!v,=# 6{
!! 微阶梯镜======================= S}/?L m}
$DO -16 15 1 y&HfF ~
{SURFACE 6/m|Sg.m
PLANE Z 0 RECTANGLE (A)/2 (L)/2 :
"| M
OBJECT 'MIRROR2_?' rNgFsFQ>.
INTERFACE COATING REFLECT AIR AIR [Ch)6p
SHIFT X (A)*?+(A)/2 'w?*4H
SHIFT Z (D2)*? $c !cO" U
} @A_bZQ@
GROUP MIRROR2_? _&Hq` KJm
SHIFT Z (L) %>dCAj"
ROTATE X -90 0 0 3HU_ ~%l
!! DETECTOR====================== na;U]IK
SURFACE %nTgrgS(=
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 %Ts6M,Fpp
OBJECT 'DETECTOR' R. sRH/6
INTERFACE COATING ABSORB AIR AIR , cbCt
!! SOURCE ======================= `CW I%V
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) %_rdO (
SOURCE DIR 0 1 0 h&$7^P
!! !!TRACE PLOT========================= +:hZ,G?>
!!WINDOW Y Z U>b mCK2
!!PLOT FACETS 5 5 !!OVERLAY 8n.sg({g
TRACE!! PLOT As$:V< Z
!!$VIEW 8X6F6RK6,1
_vQtV]
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY p)5j~ Nl
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 MZy zc{c,
PIXELS (256) wA+QUN3#n
SPREAD NORMAL Hm>M}MF3
DISPLAY or ?@Ti;
!! FORM 0.5 C@{#OOa
PICTURE .eg?FB' 7
RETURN
