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？ ~i0>[S3 '
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 k- exqM2x=
X([@}ren
SYSTEM NEW tm.&k6%
RESET F(`Q62o@
BkB9u&s^
UNITS MM *,
R ~[g
WAVELENGTHS 3.7 UM jGYl*EBx
L i+|%a
COATING PROPERTIES e 8^%}\F
1 0 'REFLECT' dKmPKeJM
0 0 'ABSORB' E)]emeG d
CVZ 4:p
PARABASAL 4 r ;O?`~2'4
BEAMS COHERENT DIFFRACT [6?x 6_M
WIDTHS 1.6 fVYv 2
G+ WCE*
A=1 bd3>IWihp
N=32 `FK qVd
L=(N)*(A) z=4E#y `?U
D1=0.625E-3 @h5 Q?I
D2=(N)*(D1) z'zC
!! 微阶梯镜======================= F#o{/u?T
$DO -16 15 1 kdMB.~(K=
{SURFACE OA7=kH@3c
PLANE Z 0 RECTANGLE (A)/2 (L)/2 bBQHxH}vi
OBJECT 'MIRROR2_?' M#yUdl7d
INTERFACE COATING REFLECT AIR AIR iHWt;]
SHIFT X (A)*?+(A)/2 hysxHOL
SHIFT Z (D2)*? BT(G9 Pj;
} ?[
D6|gp
GROUP MIRROR2_? nZ`=Up p )
SHIFT Z (L) 4VzSqb
ROTATE X -90 0 0 vIFx'S~D
!! DETECTOR====================== +EZr@
SURFACE F|&m xsL
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 AI .2os*
OBJECT 'DETECTOR' XV !UeBq
INTERFACE COATING ABSORB AIR AIR ?hW(5]p|
!! SOURCE ======================= )EG-xo@X
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) i k0w\*
SOURCE DIR 0 1 0 5 d|+ c<
!! !!TRACE PLOT========================= )Y?E$=M +B
!!WINDOW Y Z C |rl",&
!!PLOT FACETS 5 5 !!OVERLAY qt%/0
TRACE!! PLOT K=2j}IPe
!!$VIEW l`];CALA4
3iiOxg?j
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY ezd@>(hJ
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 lqKwjJ tX
PIXELS (256) ]o_E]5"jO
SPREAD NORMAL B^hK
DISPLAY U4Pk^[,p1G
!! FORM 0.5 [oH,FSuO!2
PICTURE j MA%`*r
RETURN
