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？ #wZH.i #
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 = hY/Yr%P
JY~CMR5#.O
SYSTEM NEW 9\0$YY%
RESET imKMPO=
8Dn~U :F/?
UNITS MM eo.B0NZsF
WAVELENGTHS 3.7 UM wyXQP+9G
'rA(+-.M;
COATING PROPERTIES xJA{Hws
1 0 'REFLECT' t 6lw KK
0 0 'ABSORB' Jb-.x _Bf
(A "yE4rYK
PARABASAL 4 \)ZCB7 |
BEAMS COHERENT DIFFRACT 77ztDQDtM
WIDTHS 1.6 nlaW$b{=
Q X-n l~
A=1 p./0N.
N=32 aM(x--UR=
L=(N)*(A) Kx?8 HA[5
D1=0.625E-3 z\woTL6D]
D2=(N)*(D1) .N`*jT
!! 微阶梯镜======================= ;k ,@^f8
$DO -16 15 1 v *`M3jb
{SURFACE II Amx[ b
PLANE Z 0 RECTANGLE (A)/2 (L)/2 ydAiH*>
OBJECT 'MIRROR2_?' E]=>@EX
INTERFACE COATING REFLECT AIR AIR qwO@>wQ}~
SHIFT X (A)*?+(A)/2 g!9|1 z
SHIFT Z (D2)*? u(\O@5a
} X;
6=WqJj
GROUP MIRROR2_? 3xiDt?&H
SHIFT Z (L) 6 Rmdf>a
ROTATE X -90 0 0 |=MhI 5gsx
!! DETECTOR====================== e6^}XRyf
SURFACE S5d
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 1l Cr?
OBJECT 'DETECTOR' M>}_2G]#F
INTERFACE COATING ABSORB AIR AIR p<,`l)o}~
!! SOURCE ======================= dC|6z/
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) 1Kd6tnX
SOURCE DIR 0 1 0 =itQ@ ``r
!! !!TRACE PLOT========================= t[@>u'YKt
!!WINDOW Y Z 5pK
_-:?
!!PLOT FACETS 5 5 !!OVERLAY n9n)eI)R
TRACE!! PLOT A7|L|+ ?
!!$VIEW z,4 D' F&
sx}S,aIU
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY 76KNgV)3
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 wm_rU]
PIXELS (256) kX8NRPW
SPREAD NORMAL d ez4g
DISPLAY =%7s0l3z
!! FORM 0.5 P,9Pn)M|
PICTURE b4WH37,lA
RETURN
