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？ sC}p_'L
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 lSG"c+iV
id?B<OM
SYSTEM NEW W2`/z)[*>
RESET n OQvBc
$sxm MP
UNITS MM vVy X[ZZ
WAVELENGTHS 3.7 UM sX
c|++
svWQk9d
COATING PROPERTIES xX :N-
1 0 'REFLECT' -Pt']07E
0 0 'ABSORB' +
FG Xx
DGJt$o=&@
PARABASAL 4 GF/!@N
BEAMS COHERENT DIFFRACT \2^_v'
>K
WIDTHS 1.6 %2ZWS QD
0_f6Qrc j
A=1 LcW:vV|'K
N=32 >g+e`!;6
L=(N)*(A) w 7e+~8|
D1=0.625E-3 zqlgJn
D2=(N)*(D1) JBMJR
!! 微阶梯镜======================= [9H986 =
$DO -16 15 1 k.6gX < T
{SURFACE u}(K3H3
PLANE Z 0 RECTANGLE (A)/2 (L)/2 pR c<U^Z.h
OBJECT 'MIRROR2_?' 7f_tH_(
INTERFACE COATING REFLECT AIR AIR )+dd
SHIFT X (A)*?+(A)/2 f}ES8 Hh[
SHIFT Z (D2)*? \wb0%>
0
} 1<E:`,Mn?
GROUP MIRROR2_? ~fz9Ah U8
SHIFT Z (L) EF5 :$#
ROTATE X -90 0 0 'nP;IuMP
!! DETECTOR====================== W</\F&
SURFACE `Qxdb1>mjY
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 W_FN*Er
OBJECT 'DETECTOR' Br}0dha3E
INTERFACE COATING ABSORB AIR AIR iT,Ya-9"
!! SOURCE ======================= ZB'ms[
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) 4&_|myO&
SOURCE DIR 0 1 0 oeF0t'%
!! !!TRACE PLOT========================= D]*<J"/]d
!!WINDOW Y Z f@aF s]xV
!!PLOT FACETS 5 5 !!OVERLAY nmy!.0SQ-
TRACE!! PLOT 1Farix1YDq
!!$VIEW a F5=k: k
x!;;;iS
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY TBu[3X%
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 *]+5T-R% $
PIXELS (256) Og/@w&
SPREAD NORMAL &A)u!l Ue
DISPLAY =DLVWz/<
!! FORM 0.5 K/IG6s;Xj
PICTURE .e1Yd8
RETURN
