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? Tc.k0n%W:b
以下是我的ASAP代码,可以拷贝运行一下。
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SYSTEM NEW {>rGe#Vu
RESET T_3JAH e
nEgDwJ<wl
UNITS MM OJ!=xTU%h
WAVELENGTHS 3.7 UM t'{IE!_
3 jR I@
COATING PROPERTIES SSo7
U
1 0 'REFLECT' p;0p!~F=49
0 0 'ABSORB' r=74'g
Md[M}d8
PARABASAL 4 vj,OX~|
BEAMS COHERENT DIFFRACT {@YY8SKb9
WIDTHS 1.6 R.'-jvO
mtd ,m
A=1 /;{E}`
N=32 l>){cI/D#
L=(N)*(A) 56`Tna,t
D1=0.625E-3 qr<RMs
D2=(N)*(D1) nkTpUbS'f?
!! 微阶梯镜======================= %pG^8Q()
$DO -16 15 1 0s'h2={iI
{SURFACE `G0GWh)`x
PLANE Z 0 RECTANGLE (A)/2 (L)/2 68 \73L=
OBJECT 'MIRROR2_?' k3yA*Ec
INTERFACE COATING REFLECT AIR AIR cN3!wE
SHIFT X (A)*?+(A)/2 K6d2}!5
SHIFT Z (D2)*? qEJ#ce]G
} EJ@&vuDd$
GROUP MIRROR2_? 0Fc^c[
SHIFT Z (L) }huFv*<@'
ROTATE X -90 0 0 $~c
wB
!! DETECTOR====================== 6 @A'N(I=O
SURFACE *'to#_n&W
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 oT0TbZu%
OBJECT 'DETECTOR' ?[VL
2dP0
INTERFACE COATING ABSORB AIR AIR OUFx M
!! SOURCE ======================= P+:DLex
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) `~k`m{4.a
SOURCE DIR 0 1 0 ,[UK32KWI
!! !!TRACE PLOT========================= NXHe;G
!!WINDOW Y Z gzd<D}2F~
!!PLOT FACETS 5 5 !!OVERLAY +=M N_
TRACE!! PLOT r\T'_wo
!!$VIEW f>hA+
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O
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY @s.civ!Yk
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 4H4ui&|7u6
PIXELS (256) ;_p$5GVR|
SPREAD NORMAL v|Y
ut~
DISPLAY v8l3{qq
!! FORM 0.5 K
7OIT2-
PICTURE N@#,Y nPI
RETURN