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？ x@P{l&:>
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 b
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SYSTEM NEW t$^l<ppQ
RESET B~r}c4R{7
(k-YI{D3
UNITS MM kL@Wb/K JP
WAVELENGTHS 3.7 UM cu#e38M&eE
Z\X'd_1!
COATING PROPERTIES hJ%1
1 0 'REFLECT' tP
~zKU
0 0 'ABSORB' ?4 PQQd
jRkC/Lw
PARABASAL 4 q5 &Ci`
BEAMS COHERENT DIFFRACT 5''*UFIF1
WIDTHS 1.6 B_3QQ tjAl
pL oy
A=1 /<)-q-W;
N=32 WbjF]b\
L=(N)*(A) ? s}
%
D1=0.625E-3 D >ai.T%n
D2=(N)*(D1) ~JZ3a0$^
!! 微阶梯镜======================= -Q$nA>trKA
$DO -16 15 1 fhp)S",
{SURFACE XL<
)v_
PLANE Z 0 RECTANGLE (A)/2 (L)/2 GA^mgm"O
OBJECT 'MIRROR2_?' W|Ldu;#
INTERFACE COATING REFLECT AIR AIR ^,s?e.u$8`
SHIFT X (A)*?+(A)/2 \,W.0#D8v4
SHIFT Z (D2)*? irx z l3
} B5=3r1 Ly
GROUP MIRROR2_? .{dE}2^
SHIFT Z (L) " mj^+u-
ROTATE X -90 0 0 G^h_ YjR`*
!! DETECTOR====================== T@+Cl Z i
SURFACE i1*C{Lf;%)
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 ^^Lj I
OBJECT 'DETECTOR' nW;kcS*A
INTERFACE COATING ABSORB AIR AIR p]LnE `v
!! SOURCE ======================= =DgC C|p
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) !c8L[/L
SOURCE DIR 0 1 0 4^Qi2[ w
!! !!TRACE PLOT========================= ^KHLBSc:
!!WINDOW Y Z n`5WXpz4 ;
!!PLOT FACETS 5 5 !!OVERLAY g,lY ut
TRACE!! PLOT U~is-+Uq
!!$VIEW IvU{Xm"qB
b;vNq
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY lJ/6-dP
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 l:e9y $_)
PIXELS (256) xEoip?O?7F
SPREAD NORMAL A!HK~yk~Q
DISPLAY ;<6 "JP>0
!! FORM 0.5 .P/xs4
PICTURE ?iz <
RETURN
