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? _Ne fzZWUJ
以下是我的ASAP代码,可以拷贝运行一下。 Co>e<be%S
MH=7(15R
SYSTEM NEW *:bexD H
RESET bd]9kRq1K
50_[n$tqE
UNITS MM >3ax `8
WAVELENGTHS 3.7 UM Xii>?sA5Z"
"i#aII+T
COATING PROPERTIES k/P.[5
1 0 'REFLECT' [ ?%q,>F
0 0 'ABSORB' Lq|>n[KY
m8@&-,T
PARABASAL 4 G/*;h,NbNr
BEAMS COHERENT DIFFRACT pHT]2e#
WIDTHS 1.6 sSd/\Ap
Z1#u&oX
A=1 '2GnA ws^
N=32 _Jy7` 4B.
L=(N)*(A) &&nbdu
D1=0.625E-3 &rG B58
D2=(N)*(D1) F+"_]
!! 微阶梯镜======================= #x;,RPw5
$DO -16 15 1 wA\5-C7j
{SURFACE |lt]9>|
PLANE Z 0 RECTANGLE (A)/2 (L)/2 q3AqU?f
OBJECT 'MIRROR2_?' )adV`V%=>
INTERFACE COATING REFLECT AIR AIR AdVc1v&>
SHIFT X (A)*?+(A)/2 l+[:Cni
SHIFT Z (D2)*? v\GVy[Qyv
} m>%b4M
GROUP MIRROR2_? h);^4cU
SHIFT Z (L) t;BUZE_!0c
ROTATE X -90 0 0 1rJ2}d\y
!! DETECTOR====================== w9{C"K?u=
SURFACE CHsg2S
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 R*:>h8
OBJECT 'DETECTOR' w8XCU>
|
INTERFACE COATING ABSORB AIR AIR <
Hkq
!! SOURCE ======================= #8|LPfA
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) ?u|@,tQ[
SOURCE DIR 0 1 0 ,$0-I@*V
!! !!TRACE PLOT========================= 4);_f
!!WINDOW Y Z W7^[W.
!!PLOT FACETS 5 5 !!OVERLAY TG%B:^Yz!
TRACE!! PLOT `PC9t)%.pV
!!$VIEW #L~i|(=U5
U}LW8886
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY I |U'@E
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 p&h?p\IF
PIXELS (256) {uj_4Ft
SPREAD NORMAL lj (y
DISPLAY G
5;6q
!! FORM 0.5 >>
zd
PICTURE ]K"&Vd
RETURN