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? C"m0"O>
以下是我的ASAP代码,可以拷贝运行一下。 woH3?zR
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SYSTEM NEW h> 5~
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RESET f@.Q%+!4
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UNITS MM $qyM
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WAVELENGTHS 3.7 UM <hF~L k ,
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COATING PROPERTIES I3E8vi%B.
1 0 'REFLECT' y3o4%K8
0 0 'ABSORB' CyBM4qyH
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PARABASAL 4 koWb@V]
BEAMS COHERENT DIFFRACT [Ey%uh
6*
WIDTHS 1.6 A'AWuj\r2R
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A=1 [q+39
N=32 CR<pB)F?a
L=(N)*(A) *ej o6>
D1=0.625E-3 my\oC^/9
D2=(N)*(D1) Ynh4oWUp
!! 微阶梯镜======================= wM&x8 <
$DO -16 15 1 N n-6/]d#
{SURFACE Ew,wNR`
PLANE Z 0 RECTANGLE (A)/2 (L)/2 m"m;(T{ v
OBJECT 'MIRROR2_?' R^O)fL 0_
INTERFACE COATING REFLECT AIR AIR }Yl8Q>t
SHIFT X (A)*?+(A)/2 ZwrYss
SHIFT Z (D2)*? [N$_@[
} ORPl^n-
GROUP MIRROR2_? |`D5XRVbi
SHIFT Z (L) ToXFMkwY
ROTATE X -90 0 0 @U.}Ei
!! DETECTOR====================== d@`:9
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SURFACE i.dAL)V
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 e=Tc(Mwn
OBJECT 'DETECTOR' (Gk]<`d#N
INTERFACE COATING ABSORB AIR AIR _j<M}
!! SOURCE ======================= /g-X=|?F
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) 3$G25=eN
SOURCE DIR 0 1 0 ^EBM;&;7
!! !!TRACE PLOT========================= {kO:HhUg
!!WINDOW Y Z LYT<o FE-
!!PLOT FACETS 5 5 !!OVERLAY EsxTBg
TRACE!! PLOT [Ik
B/Xbw|
!!$VIEW 9oN'.H^
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CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY 9d(v^T
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 p~;z"Z
PIXELS (256) pC.P
SPREAD NORMAL 2<. /HH*f
DISPLAY *8eh%3_$h
!! FORM 0.5 ]T$w7puaJ
PICTURE =<uz'\Ytv%
RETURN