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? bq}`jP~#
以下是我的ASAP代码,可以拷贝运行一下。 $?;)uoAg
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SYSTEM NEW 2=VFUR 8
RESET OgzKX>N`A
A^\g]rmK
UNITS MM F&7^M0x\ O
WAVELENGTHS 3.7 UM aR)w~s\6
!~xlze
COATING PROPERTIES
JL7;l0#
1 0 'REFLECT' }:]CXrdg>
0 0 'ABSORB' X#fjIrn
/:C<{m.[}
PARABASAL 4 Z dT-
BEAMS COHERENT DIFFRACT ;O<-4$
WIDTHS 1.6 j=u)
z7J
xg'xuz$U
A=1 ]L
k- -\
N=32 E!=Iz5
L=(N)*(A) $qR@;=
D1=0.625E-3 H=mFc@fh
D2=(N)*(D1) =tGRy@QV'\
!! 微阶梯镜======================= `r %lB
$DO -16 15 1 zNg[%{mz
{SURFACE -'^:+FU
PLANE Z 0 RECTANGLE (A)/2 (L)/2 kR8,E 6Up
OBJECT 'MIRROR2_?' 4K|O?MUNS
INTERFACE COATING REFLECT AIR AIR 5eM{>qr}
SHIFT X (A)*?+(A)/2 qXoq<
|
SHIFT Z (D2)*? VU+=b+B~m
} MieO1l
GROUP MIRROR2_? CF: !
SHIFT Z (L) UUGX@
ROTATE X -90 0 0 nXERj; Q"
!! DETECTOR====================== h%sw^;\!
SURFACE I
|"'
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 I[n|#N
OBJECT 'DETECTOR' ^AoX|R[1%
INTERFACE COATING ABSORB AIR AIR mRxeob
!! SOURCE ======================= v]T?xo~@'
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) G[{Av5g mx
SOURCE DIR 0 1 0 CQ7NQ^3k
!! !!TRACE PLOT========================= eWr6@
!!WINDOW Y Z ('o}EoXS
!!PLOT FACETS 5 5 !!OVERLAY wU"w
TRACE!! PLOT ;/)$Cm &e
!!$VIEW 1E0!?kRK
7vc4 JO]
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY =>@
X+4Kb
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 }#&L
PIXELS (256) {YwdhwJP
SPREAD NORMAL 3r[s_Y*
DISPLAY z|zEsDh;
!! FORM 0.5 u~~ ~@p
PICTURE 0:c3aq&u
RETURN