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? B0]~el
以下是我的ASAP代码,可以拷贝运行一下。 BR yl4
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SYSTEM NEW ~M4;
RESET ?<'}r7D
"1M[5\Ax
UNITS MM E=!\z%4
WAVELENGTHS 3.7 UM W9GVt$T7
|8tilOqI
COATING PROPERTIES H~1jY4E
1 0 'REFLECT' QB'aON\S
0 0 'ABSORB' A2jUmK.&
*CI#+P
PARABASAL 4 | h#u^v3
BEAMS COHERENT DIFFRACT 81
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WIDTHS 1.6 wD'SPk5S?
@r/nF5
A=1 &FN.:_E
N=32 j HJ`,#
L=(N)*(A) P
m e^l%M
D1=0.625E-3 rCdu0 gYT
D2=(N)*(D1) y/ef>ZZ
!! 微阶梯镜=======================
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$DO -16 15 1 [:SWi1cK2
{SURFACE 338k?nHxv
PLANE Z 0 RECTANGLE (A)/2 (L)/2
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OBJECT 'MIRROR2_?' zue~ce73J
INTERFACE COATING REFLECT AIR AIR %aVq+kC h
SHIFT X (A)*?+(A)/2 i6Emhji
SHIFT Z (D2)*? \n|EM@=eE
} 5uj?#)N
GROUP MIRROR2_? JYbL?N
SHIFT Z (L) ou{2@"
ROTATE X -90 0 0 l?n\i]'
!! DETECTOR====================== K^<BW(s
SURFACE z/@slT
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 6fEqqUeV
OBJECT 'DETECTOR' aQ\$A`?
INTERFACE COATING ABSORB AIR AIR >V8-i`
!! SOURCE ======================= K} X&AJ5A
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) \\B(r
SOURCE DIR 0 1 0 7}5JDG
!! !!TRACE PLOT========================= Sw,+p
!!WINDOW Y Z +E(L \
!!PLOT FACETS 5 5 !!OVERLAY <&g,Nc'5C
TRACE!! PLOT EaY?aAuS:
!!$VIEW >$/>#e~
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CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY eiaFaYe\
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 9w"4K.
PIXELS (256) <
!C)x
SPREAD NORMAL m'=Crei
DISPLAY wIaony
!! FORM 0.5 6HWE~`ok6
PICTURE h_,i&d@(
RETURN