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？ `+uXL9mo
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 ?]z
._I`E
!=we7vK}
SYSTEM NEW -O5m@rwt<
RESET &<V~s/n=6?
J 0 P
UNITS MM { SfU!
WAVELENGTHS 3.7 UM ;W].j%]L e
zN1;v6;
COATING PROPERTIES \ a!<^|C &
1 0 'REFLECT' d1-p];&
0 0 'ABSORB' ry0 =N^
5*AKl< Jl
PARABASAL 4 AMdS+(J
BEAMS COHERENT DIFFRACT 3(%,2
WIDTHS 1.6 gUp0RP s
F'I6a E%
A=1 hd~rC*I
N=32 d%hA~E1rR
L=(N)*(A) 2"O Y]d
D1=0.625E-3 6,PL zZ5
D2=(N)*(D1) i1
&'Zh
!! 微阶梯镜======================= 0=B5
=qyw
$DO -16 15 1 l&B'.6XKs
{SURFACE i'<1xd(`
PLANE Z 0 RECTANGLE (A)/2 (L)/2 R 6Em^A/>
OBJECT 'MIRROR2_?' KfNXX>'
INTERFACE COATING REFLECT AIR AIR ]@YQi<d2^
SHIFT X (A)*?+(A)/2 9YABr>
?
SHIFT Z (D2)*? Ox Z:5ps
} %a `dO EO
GROUP MIRROR2_? BP$#a
#
SHIFT Z (L) R{_ IrYk
ROTATE X -90 0 0 K }BX6dA
!! DETECTOR====================== R
28*
SURFACE }^7V^W
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 SO/]d70HG
OBJECT 'DETECTOR' 4&D="GA
INTERFACE COATING ABSORB AIR AIR 1tW:(~ =a;
!! SOURCE ======================= IJ; *N
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) 3;:V1_JA
SOURCE DIR 0 1 0 x3 | 'jmg
!! !!TRACE PLOT========================= ub5hX{uT
!!WINDOW Y Z '9@R=#nd
!!PLOT FACETS 5 5 !!OVERLAY ?C35
TRACE!! PLOT ` 'WLGQG
!!$VIEW 5g5NTm`=<
!$Z"\v'b
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY 9DX3]Z\7X
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 Sj?sw]3
PIXELS (256) CN(4;-so)
SPREAD NORMAL B:cOcd?p
DISPLAY 1#"Q' ,7
!! FORM 0.5 .Er/t"Qs;
PICTURE %<yM=1~>
RETURN
