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？ r>lC(x\B
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 [MM 11K
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SYSTEM NEW Xg#g`m%(M
RESET GiBq1U-Q
o5+N_5OE}E
UNITS MM htg+V-,
WAVELENGTHS 3.7 UM rnxO2
-0| '{
COATING PROPERTIES tYt/m6h
1 0 'REFLECT' tR#uDE\wR
0 0 'ABSORB' VHsNz WI
Y W"?F y
PARABASAL 4 * wN+Ak q
BEAMS COHERENT DIFFRACT >gDsjHQ6;
WIDTHS 1.6 d>F=|dakL
WU1 I>i
A=1 Py 8o8* H
N=32 di6A.N5A
L=(N)*(A) Z2 B59,I
D1=0.625E-3 (mHFyEG
D2=(N)*(D1) 2vKnxK+ 5
!! 微阶梯镜======================= T8YqCT"EA<
$DO -16 15 1 AX8; x1t^.
{SURFACE Uc
e#v)
PLANE Z 0 RECTANGLE (A)/2 (L)/2 0-Xpq,0
OBJECT 'MIRROR2_?' WPyd ^Y<
INTERFACE COATING REFLECT AIR AIR <R~(6krJwZ
SHIFT X (A)*?+(A)/2 $Vp&Vc8
SHIFT Z (D2)*? Ks09F}
}
K)GC&%_$O
GROUP MIRROR2_? &K k+RHM
SHIFT Z (L) b]6;:Q!d
ROTATE X -90 0 0 #UU}lG
!! DETECTOR====================== ^~MHxF5d
SURFACE V&KH{j/P
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 , =>O/!s
OBJECT 'DETECTOR' nngL,-v#F
INTERFACE COATING ABSORB AIR AIR @N.W #<IG
!! SOURCE ======================= B7t #H?
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) {NE;z<,*:
SOURCE DIR 0 1 0 l) VMF44
!! !!TRACE PLOT========================= CT4R/wzY7
!!WINDOW Y Z n<yV]i$
!!PLOT FACETS 5 5 !!OVERLAY cJ:BEe
TRACE!! PLOT "DWw1{ 5/
!!$VIEW : M0LAN
z[q M2
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY [.z1
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 LEVNywk[
PIXELS (256) & A9psc(,&
SPREAD NORMAL V6wYJ$]
DISPLAY ~2A<fL,-
!! FORM 0.5 7Yj\*N
PICTURE h. 'h L
RETURN
