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？ D}_.D=)
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 yqT !A
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SYSTEM NEW XB) D".\
RESET J2bvHxb Rd
XUqorE
UNITS MM nf.Ox.kM)
WAVELENGTHS 3.7 UM QJ|@Y(KV0
8dGsV5" *
COATING PROPERTIES -'! J?~
1 0 'REFLECT' T+kV~ w{
0 0 'ABSORB' ^q:-ZgM>
hbw(o
PARABASAL 4 =+zDE0Qs
BEAMS COHERENT DIFFRACT k# [!; <
WIDTHS 1.6 #-/W? kD
iQ'*QbP'Z
A=1 Ez3fL&*
N=32 #[+# bw_6
L=(N)*(A) 3_(_yEKx
D1=0.625E-3
gjS|3ED
D2=(N)*(D1) @) Qgy}*5
!! 微阶梯镜======================= l2D*b93
$DO -16 15 1 K" #$",}=
{SURFACE 1- 2hh)
PLANE Z 0 RECTANGLE (A)/2 (L)/2 0U '"@A
\
OBJECT 'MIRROR2_?' b9b Ivjm_
INTERFACE COATING REFLECT AIR AIR P`Np +E#I
SHIFT X (A)*?+(A)/2 pSs*Z6c)@
SHIFT Z (D2)*? 02;jeZ#z
} V=O52?8
GROUP MIRROR2_? GEBSUvM 7
SHIFT Z (L) e &6 %
ROTATE X -90 0 0 FK%b@/7s~
!! DETECTOR====================== i'IT,jz !
SURFACE {{G)Ry*pb
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 ~k"+5bHa*
OBJECT 'DETECTOR' broLC5hbQU
INTERFACE COATING ABSORB AIR AIR 8q2a8I9g
!! SOURCE ======================= H I g2y
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) lx)^wAO4
SOURCE DIR 0 1 0 Iy<>-e"|
!! !!TRACE PLOT========================= D6"=2XR4n
!!WINDOW Y Z e4z`:%vy
!!PLOT FACETS 5 5 !!OVERLAY >)>f~ >
TRACE!! PLOT &f*o rM:
!!$VIEW [Vd$FDki
k<gH*=uXY'
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY D I C*{aBf
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 ZpTDM1ro
PIXELS (256) (b&g4$!x&5
SPREAD NORMAL JcAsrtrG]
DISPLAY ;%e&6
!! FORM 0.5 :eN&wQ5q
PICTURE t {md&k4
RETURN
