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？ amQz^^
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 nW?R"@Zm
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SYSTEM NEW 6#A:}B<?
RESET 2=ztKfsBhE
5jq=_mHt
UNITS MM K t#,]]
WAVELENGTHS 3.7 UM
z&4~x!-_
x?D/.vrOY
COATING PROPERTIES GD-&_ 6a
1 0 'REFLECT' @;wzsh >o
0 0 'ABSORB' y33~HsOJ
si(;y ](
PARABASAL 4 )R{UXk3q}
BEAMS COHERENT DIFFRACT 4 c'4*`I
WIDTHS 1.6 7.bN99{xPM
*@ED}Mj+
A=1 0"[`>K~7a8
N=32 +pqM ^3t|y
L=(N)*(A) wHsB,2H
D1=0.625E-3 !PUp>(
D2=(N)*(D1) rn.\tDeA
!! 微阶梯镜======================= e,A)U5X
$DO -16 15 1 0'$p$K
{SURFACE kpob b
PLANE Z 0 RECTANGLE (A)/2 (L)/2 :u%$0p>
OBJECT 'MIRROR2_?' A~lIa$U$b
INTERFACE COATING REFLECT AIR AIR klWYuStZ
SHIFT X (A)*?+(A)/2 n"aCt%v
SHIFT Z (D2)*? |kiJ}oy
} o4=Yu7L
GROUP MIRROR2_? hv)7H)|l~]
SHIFT Z (L) Qu{c B^Ga*
ROTATE X -90 0 0 Uedvc5><t
!! DETECTOR====================== oU W<4l
SURFACE INMP"1
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 w\|Ei(
OBJECT 'DETECTOR' 3/M.0}e
INTERFACE COATING ABSORB AIR AIR |;;!8VO3J
!! SOURCE ======================= Gg0#H^s( (
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) `hB1b["(
SOURCE DIR 0 1 0 h5 @j`{
!! !!TRACE PLOT========================= ACBQ3
!!WINDOW Y Z {w`:KR6o7
!!PLOT FACETS 5 5 !!OVERLAY #A <1aQ
TRACE!! PLOT I6OSC&A`
!!$VIEW 9]_GNk-D
oJaAM|7uv
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY p4/$EPt)lY
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 .?#uxd~>
PIXELS (256) WO%h"' iJ
SPREAD NORMAL !eD+ GDgE]
DISPLAY Nh)[r x
!! FORM 0.5 w;`m- 9<Y
PICTURE O25m k X
RETURN
