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？ (HJ$lxk<2h
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 9'X@@6b*'
6=3(oUl
SYSTEM NEW b- uZ"Kf^
RESET '$*[SauAG
%r P !
UNITS MM 952V@.Zp
WAVELENGTHS 3.7 UM |Q6h /" 2
[%? hCc
COATING PROPERTIES _eh3qs:
1 0 'REFLECT' _j>L4bT
0 0 'ABSORB' { s9<ej~<R
lfgtcR {l5
PARABASAL 4 [x|)}P7%s
BEAMS COHERENT DIFFRACT ]f5c\\)
WIDTHS 1.6 U\?+s2I)v
UI_v3 c3b
A=1 4`6 < {
N=32 Fq4lXlSB
L=(N)*(A) _1\poAy
D1=0.625E-3 k|5k8CRX
D2=(N)*(D1) @R f^P(
!! 微阶梯镜======================= SlT7L||Ww
$DO -16 15 1 cPSti
{SURFACE "G @E6{/
PLANE Z 0 RECTANGLE (A)/2 (L)/2 EFD?di)s
OBJECT 'MIRROR2_?' DEcGFRgN~
INTERFACE COATING REFLECT AIR AIR $-e=tWkg v
SHIFT X (A)*?+(A)/2 |lY`9-M`I
SHIFT Z (D2)*? '?b\F~$8
} N -xnenci
GROUP MIRROR2_? z : ? :
SHIFT Z (L) Gj*SP U
ROTATE X -90 0 0 IBDVF A
!! DETECTOR====================== ) u-ns5
SURFACE # 'wL\3
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 t)KPp |&
OBJECT 'DETECTOR' C&e8a9*,(a
INTERFACE COATING ABSORB AIR AIR >I|<^$/
!! SOURCE ======================= X4Lsvvz%@
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) *s~i 2}
SOURCE DIR 0 1 0 IE|, ~M2
!! !!TRACE PLOT========================= {x|MA(NO
!!WINDOW Y Z k}#@8n|b
!!PLOT FACETS 5 5 !!OVERLAY d;<.;Od$`
TRACE!! PLOT d0Tg qO{
!!$VIEW |MVV +.X
'Z y{mq\
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY u !M& ;QL
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 8z?$t-D O
PIXELS (256) x~% \y
SPREAD NORMAL 8cB=}XgYS
DISPLAY UYH|?Jw!N
!! FORM 0.5 ? 1GJa]G
PICTURE {rz>^
RETURN
