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? 2=+ ,jX{
以下是我的ASAP代码,可以拷贝运行一下。 b<7qmg3
X+@,vCC
SYSTEM NEW 1R9/AP
RESET E=trJge
]zY'w,?D\F
UNITS MM K 5[ 3WHQ
WAVELENGTHS 3.7 UM RtL'fd
*4y r7~S5
COATING PROPERTIES Jj:4@p:
1 0 'REFLECT' j-|0&X1C
0 0 'ABSORB' '|T=
HpAZ{P7
PARABASAL 4 |_m;@.44?U
BEAMS COHERENT DIFFRACT f'U]Ik;Jy
WIDTHS 1.6 tYa8I/HpT
o-=lH tR
A=1 h]P$L>
N=32 zt0 zKXw
L=(N)*(A) JqZ5DjI:
D1=0.625E-3 a| cD{d
D2=(N)*(D1) /d'u1FnA=
!! 微阶梯镜======================= &r%3)Z8Et
$DO -16 15 1 DBDfBb
{SURFACE T7'$A!c
PLANE Z 0 RECTANGLE (A)/2 (L)/2 g2q=&eI"
OBJECT 'MIRROR2_?' D IN
PAyY
INTERFACE COATING REFLECT AIR AIR s'I$yJ)@2E
SHIFT X (A)*?+(A)/2 ] plC
SHIFT Z (D2)*? -2_$zk*n
} 5yI D%
GROUP MIRROR2_? $ 1ZY
Vw
SHIFT Z (L) bP@_4Dy
ROTATE X -90 0 0 OpQa!
!! DETECTOR====================== lR!$+atW
SURFACE C-Z,L#
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 wBET.l'd
OBJECT 'DETECTOR' y[rLk
INTERFACE COATING ABSORB AIR AIR DBRJtU!5x
!! SOURCE ======================= H"l'E9k.&p
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) b.;W|$ .
SOURCE DIR 0 1 0 3F1Z$d(
!! !!TRACE PLOT========================= !Ao?bs'
!!WINDOW Y Z !TFVBK
!!PLOT FACETS 5 5 !!OVERLAY kn\>ZgU
TRACE!! PLOT (tv h9o
!!$VIEW r "R\
x7?{*w&r
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY e)kf;Hkf
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 Eqc$*=
PIXELS (256) Y<v55m-
SPREAD NORMAL =F4}
DISPLAY |sh U
!! FORM 0.5 %Y TIS*+0
PICTURE Ipe; %as#
RETURN