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？ pW>{7pXn
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 { 5d 5Y%&
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SYSTEM NEW ),xD5~_=q
RESET '^$+G0jv
0bIgOLP
UNITS MM SN\c 2^#
WAVELENGTHS 3.7 UM ?gjx7TQ ?
%9S0!h\
COATING PROPERTIES A%^7D.j
1 0 'REFLECT' E'SDT*EI
0 0 'ABSORB' _./s[{ek
39F
e#u
PARABASAL 4 6Q_A-X3hk
BEAMS COHERENT DIFFRACT %&V%=-O_7
WIDTHS 1.6 n%4/@M
$p$p C/:%
A=1 rcY &n^:
N=32 ,j.bdlI#
L=(N)*(A) #V#!@@c;?
D1=0.625E-3 8~TKiR5
D2=(N)*(D1) |')PQ
!! 微阶梯镜======================= M:iH7K
$DO -16 15 1 X:g#& e_
{SURFACE zZ<*
PLANE Z 0 RECTANGLE (A)/2 (L)/2 (hQi {
OBJECT 'MIRROR2_?' 4udj"-V
INTERFACE COATING REFLECT AIR AIR uhp.Yv@c
SHIFT X (A)*?+(A)/2 J1~E*t^
SHIFT Z (D2)*? n 5 ^57[(
} # h4FLF_w
GROUP MIRROR2_? G'(rjH>q
SHIFT Z (L) ;YW@ 3F-h
ROTATE X -90 0 0 HiH<'m"\.
!! DETECTOR====================== j:/Z_v'
SURFACE c/v|e &q
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 WW &Wh<4
OBJECT 'DETECTOR'
P +OS
INTERFACE COATING ABSORB AIR AIR :Q@/ F;Z?
!! SOURCE ======================= ;DR5?N/a
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) }<l:~-y|
SOURCE DIR 0 1 0 0(:SEiz6s
!! !!TRACE PLOT========================= m]8*k=v
!!WINDOW Y Z Q> rr?L`
!!PLOT FACETS 5 5 !!OVERLAY ~a&V sC#
TRACE!! PLOT W g6 H~x
!!$VIEW X?n=U ebO^
B.~]
7H5"(
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY |g!d[ct]
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 Z*UVbyC
PIXELS (256) <'SS I Mr
SPREAD NORMAL jC{KI!kPt
DISPLAY &) ;P|v`8
!! FORM 0.5 [A"=!e$<
PICTURE jY]51B
RETURN
