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？ En6H%^d2
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 C [uOReo
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SYSTEM NEW =JS;;PzX[
RESET C/=XuKE-t
vUA0FoOp
UNITS MM ;sPoUn
s'
WAVELENGTHS 3.7 UM m ee$"Y
l@JSK ;
COATING PROPERTIES &fOdlQ ?
1 0 'REFLECT' *\uM.m0$
0 0 'ABSORB' l;A,0,i
&?,6~qm[
PARABASAL 4 lrWQOYf2
BEAMS COHERENT DIFFRACT +7V{ABfGl
WIDTHS 1.6 Wg `AZ=t
(u3s"I
d
A=1 Y&HK 1>M_
N=32 }8-\A7T
L=(N)*(A) hm*cw[#O1x
D1=0.625E-3 U] |agz>
D2=(N)*(D1) SqA
J-_~
!! 微阶梯镜======================= N |g;W
$DO -16 15 1 '8 Ztj
{SURFACE nmU_N:Y
PLANE Z 0 RECTANGLE (A)/2 (L)/2 a :, y
Z
OBJECT 'MIRROR2_?' I6!5Yj]O"
INTERFACE COATING REFLECT AIR AIR P>ceeoYQuA
SHIFT X (A)*?+(A)/2 ~ PWSo%W8
SHIFT Z (D2)*? ^Xb7[ +I6
} [, RI-#n
GROUP MIRROR2_? d[ >`")2)
SHIFT Z (L) #H?t!DU
ROTATE X -90 0 0 # ]?bLm<!
!! DETECTOR====================== G!N{NCq
SURFACE B/JO ~;{
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 {6 6sB{P
OBJECT 'DETECTOR' tR0pH8?e"
INTERFACE COATING ABSORB AIR AIR -|k)tvAm
!! SOURCE ======================= X?:o;wB
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) fWc|gq
SOURCE DIR 0 1 0 $rF=_D6
!! !!TRACE PLOT========================= 0MMEo~dih
!!WINDOW Y Z h^9"i3H
!!PLOT FACETS 5 5 !!OVERLAY b- U
eIjX
TRACE!! PLOT [H<bh%
!!$VIEW 1=sXdcy;
/M;#_+VK<
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY fKC3-zm
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 !Z!g:II
/
PIXELS (256) im} ?rY
SPREAD NORMAL Zn=T#o
DISPLAY VGHWNMT
!! FORM 0.5 =*qD4qYA
PICTURE \Ng\B.IQ
RETURN
