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? e.8$ga{
以下是我的ASAP代码,可以拷贝运行一下。 %\6Q .V#s
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SYSTEM NEW PVYyE3`UB
RESET 5k$vlC#[H
r,;\/^ u*
UNITS MM o35fifM`
WAVELENGTHS 3.7 UM bK*~ol
BJy;-(JP
COATING PROPERTIES
3+U]?7t
1 0 'REFLECT' #{PmNx%M
0 0 'ABSORB' E!mmLVa9
q-_' W,
PARABASAL 4 Ow/@Z7~
BEAMS COHERENT DIFFRACT +@:L|uFU
WIDTHS 1.6 uM S*(L_
*C2R`gpBI
A=1 ^sClz*%?
N=32 ZA820A>2!
L=(N)*(A) ;Gd~YGW^#
D1=0.625E-3 RUo9eQIPD
D2=(N)*(D1) :dwt1>
!! 微阶梯镜======================= {x@|VuL=
$DO -16 15 1 $NG++N
{SURFACE Hj6'pJ4
PLANE Z 0 RECTANGLE (A)/2 (L)/2 qLK?%?.N<
OBJECT 'MIRROR2_?' :YO@_
INTERFACE COATING REFLECT AIR AIR wT_h!W
SHIFT X (A)*?+(A)/2 \#Up|u:
SHIFT Z (D2)*? qTmD'2
} ]l;*$2w)
GROUP MIRROR2_? (S/F)?
SHIFT Z (L)
QG3&p<
ROTATE X -90 0 0 ;rHO&(h-
!! DETECTOR====================== 2`bdrRD0
SURFACE NNkP\oh\
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 >I'%!E;
OBJECT 'DETECTOR' 0. ;}]v
INTERFACE COATING ABSORB AIR AIR vHKlLl>*2
!! SOURCE ======================= ELD!{bMT
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) HdX2YPYn;
SOURCE DIR 0 1 0 S Xr%kndS
!! !!TRACE PLOT========================= ,r^"#C0J}
!!WINDOW Y Z L%\b' fs
!!PLOT FACETS 5 5 !!OVERLAY "484n/D
TRACE!! PLOT P'$ `'J]j
!!$VIEW *?%
k#S
h<l1U'Bn7
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY I4c!m_sr
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 WO*9+\[v
PIXELS (256) \}"m'(\c
SPREAD NORMAL N#z~
DISPLAY =o 7}]k7
!! FORM 0.5 lB;FUck9
PICTURE =xN= #
RETURN