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？ -7%dg Y(
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 ap" pQ[t;
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SYSTEM NEW T, PN6d
RESET bUSa#pNO>
_ g,_G
UNITS MM '- #QK'p
WAVELENGTHS 3.7 UM t'.:"H8BI
$'<$:;4b3
COATING PROPERTIES nHp$5|r<
1 0 'REFLECT' 'SrDc'?
0 0 'ABSORB' l k
/Ke
, E$f"
PARABASAL 4 \pSRG=`
BEAMS COHERENT DIFFRACT * Gj`1# Z$
WIDTHS 1.6 PpF`0w=1%l
>!tfvM2X{
A=1 _?$w8 S%
N=32 9JJ6$cLF
L=(N)*(A) S?VKzVDB.S
D1=0.625E-3 oc p
D2=(N)*(D1) IH5^M74b
!! 微阶梯镜======================= B+pLW/4l
$DO -16 15 1 kqq1;Kd
{SURFACE 1|:;~9n<t
PLANE Z 0 RECTANGLE (A)/2 (L)/2 u^WZsW
OBJECT 'MIRROR2_?' h,b_8g{!
INTERFACE COATING REFLECT AIR AIR If8
^
SHIFT X (A)*?+(A)/2 ((^v sKT
SHIFT Z (D2)*? wgq=9\+&
} 8H8Q
GROUP MIRROR2_? Kq+vAp).
SHIFT Z (L) \nL@P6X
ROTATE X -90 0 0 4\uq$.f-
!! DETECTOR====================== Rd5pLrr[0)
SURFACE ng6E &<Z
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 l Ttc#
OBJECT 'DETECTOR' aQzmobleep
INTERFACE COATING ABSORB AIR AIR G(t &(t`[
!! SOURCE ======================= \{ C
~B;=
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) w6^TwjjZ$
SOURCE DIR 0 1 0 V !e*J,g
!! !!TRACE PLOT========================= ]g ,j
!!WINDOW Y Z x`'s
!!PLOT FACETS 5 5 !!OVERLAY BIg2`95F|
TRACE!! PLOT #] ^M/y
h
!!$VIEW 2^U?Ztth6
%?8.UW\m
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY %+UTs'I
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 z(>:LX"xz
PIXELS (256) k RSY;V
SPREAD NORMAL &._Mh
DISPLAY T ?`Ha\go
!! FORM 0.5 .E{FD%U
PICTURE v`:!$U*
H=
RETURN
