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？ E[_Z%zd^
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 5(U.<
MK=:L
SYSTEM NEW t/q\Ne\\,
RESET G m .v-T$
:l*wf/&z
UNITS MM ][qZOIk@
WAVELENGTHS 3.7 UM %oN^1a'&)
|/r@z[t
COATING PROPERTIES y0=BL
1 0 'REFLECT' L!e@T'
0 0 'ABSORB' (cA=~Bw[=
du47la 3
PARABASAL 4 xp,H5
m%
BEAMS COHERENT DIFFRACT F ] Y Pq
WIDTHS 1.6 =#>P !
ZY][LU~l8
A=1 uH wuw_eK`
N=32 1lx\Pz@ol
L=(N)*(A) b!UT<:o
D1=0.625E-3 NG b`f-:jw
D2=(N)*(D1) {O!fV<Vx 9
!! 微阶梯镜======================= s]=kD
$DO -16 15 1 oM< &4F
{SURFACE X|.X4fs
PLANE Z 0 RECTANGLE (A)/2 (L)/2 (r7~ccy4
OBJECT 'MIRROR2_?' $x`U)pv
INTERFACE COATING REFLECT AIR AIR Q0M8 }
SHIFT X (A)*?+(A)/2 tc#
rL
SHIFT Z (D2)*? ozGK
-$
} ]Q)TqwYF
GROUP MIRROR2_? _39b8s {
SHIFT Z (L) 6%fU}si,
ROTATE X -90 0 0 i44KTC"sB
!! DETECTOR====================== 47t^{WrT
SURFACE SUvHLOA
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 0eb`9y M
OBJECT 'DETECTOR' U8.DPRa
INTERFACE COATING ABSORB AIR AIR )_f
"[m %
!! SOURCE ======================= t,RR\S
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) vO"AJ`_
SOURCE DIR 0 1 0 Y .&z $+
!! !!TRACE PLOT========================= Ak4iG2
!!WINDOW Y Z f5`exfdHE
!!PLOT FACETS 5 5 !!OVERLAY w+ _'BU1 #
TRACE!! PLOT ..n-&(c32
!!$VIEW 0WYVt"|;}c
)~!Gs/w6
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY 2"%d!"
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 Zb}=?fcL;@
PIXELS (256) ~Ilgc CF
SPREAD NORMAL WXGLo;+>I
DISPLAY y+X%qTB
!! FORM 0.5 b}k`'++2,
PICTURE 4?d2#Xhs8
RETURN
