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？ /uVB[Tk^
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 `,O^=HBM
=O<BMq{d
SYSTEM NEW 9S^-qQH3}
RESET l=yO]a\QZ
60Z)AQs;+J
UNITS MM )_ uK(UNZ5
WAVELENGTHS 3.7 UM H#D=vx '
qeYr= %)c
COATING PROPERTIES [+GG Wo
1 0 'REFLECT' CT : ac64
0 0 'ABSORB' &wfM:a/c
STMcMm3
PARABASAL 4 {+MMqJCa
BEAMS COHERENT DIFFRACT f]4gDmn^
WIDTHS 1.6 K+Qg=vGY
FP$]D~DMo
A=1 qJ ! xhf1
N=32 i || /=ai
L=(N)*(A) uIu0"pv`x
D1=0.625E-3 q0}LfXql8
D2=(N)*(D1) 0=04:.% D
!! 微阶梯镜======================= x]:mc%4-Z
$DO -16 15 1 x ;I*Ho
{SURFACE 1JM~Ls%Z
PLANE Z 0 RECTANGLE (A)/2 (L)/2 Nuj%8om6
OBJECT 'MIRROR2_?' C>H U G
INTERFACE COATING REFLECT AIR AIR .d2s4q\
SHIFT X (A)*?+(A)/2 g8C+j6uR0
SHIFT Z (D2)*? BB-`=X~:m
} rRMC< .=
GROUP MIRROR2_? $]9d((u4
SHIFT Z (L) 2Y,s58F
ROTATE X -90 0 0 qxq ~9\My
!! DETECTOR====================== h*Ej}_
SURFACE i^8Zp;O"f
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 #Jn_"cCRLx
OBJECT 'DETECTOR' uZNR]+Yu@
INTERFACE COATING ABSORB AIR AIR Cpr}*A
!! SOURCE ======================= ]ba<4: [Go
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) -Fb/GZt|
SOURCE DIR 0 1 0 i9\Pks#l%
!! !!TRACE PLOT========================= R_lNC]b0
!!WINDOW Y Z 7YsFe6D"
!!PLOT FACETS 5 5 !!OVERLAY ^E9@L ??
TRACE!! PLOT UuN(+&oD-
!!$VIEW :%B o)0a9
u5lj+?
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY d;>:<{z@CD
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 ?p5Eo{B
PIXELS (256) dsh}-'>
SPREAD NORMAL W s=J)2q
DISPLAY twJck ~l~n
!! FORM 0.5 7Kn=[2J5k'
PICTURE bBZvL
RETURN
