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？ n'%*vdHK m
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 v2rX uo
&$vDC M4
SYSTEM NEW R1J" QU
RESET z\fD}`^8
CF =#?+x
UNITS MM B)ynF?"
WAVELENGTHS 3.7 UM m!E36ce}
>N+e c_D^
COATING PROPERTIES 'fawpU|h
1 0 'REFLECT' Dzc 4J66
0 0 'ABSORB' %o+bO}/9
*"j_3vAx
PARABASAL 4 o"QpV
>x
BEAMS COHERENT DIFFRACT Q.M3rRh
WIDTHS 1.6 . R biF
&A Ow(?2
A=1 q:1 1XPP
N=32 u+th?KO`
L=(N)*(A) Y6 ^lKw
D1=0.625E-3 >2>x r"
D2=(N)*(D1) iT9cw`A^ %
!! 微阶梯镜======================= p~Dm3^Y
$DO -16 15 1 `C_#EU-
{SURFACE fB;'U
PLANE Z 0 RECTANGLE (A)/2 (L)/2 +< bq@.x
OBJECT 'MIRROR2_?' 2tn%/gf'm
INTERFACE COATING REFLECT AIR AIR D1#E&4
SHIFT X (A)*?+(A)/2 YJeZ{Wws
SHIFT Z (D2)*? gjyg`%
} pN4!* 7M
GROUP MIRROR2_? !Me%W3
SHIFT Z (L) ?vf\_R'M
ROTATE X -90 0 0 ?R"5 .3
!! DETECTOR====================== br$!}7#=L
SURFACE PX2Ejrwj
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 ><`.(Z5c
OBJECT 'DETECTOR' K< Ct
INTERFACE COATING ABSORB AIR AIR bp$8hUNYz-
!! SOURCE ======================= pMa 3R3a
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) gY*Cl1 Iz
SOURCE DIR 0 1 0 t$I rr*
!! !!TRACE PLOT========================= j cx/Z R
!!WINDOW Y Z YF&SH)Y7
!!PLOT FACETS 5 5 !!OVERLAY #J^p,6
TRACE!! PLOT WMh'<'w N_
!!$VIEW j]
M)i:n
HzbO#)Id-I
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY a7#Eyw^H{
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 >2$Ehw:K^
PIXELS (256) iF61J% 3-
SPREAD NORMAL |a\s}M1
DISPLAY /:awPYGH<1
!! FORM 0.5 @$+l ^"#-]
PICTURE hn!$?Vo.
RETURN
