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？ [2~Et+r6g
以下是我的ＡＳＡＰ代码，可以拷贝运行一下。 1XU sr;Wz
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SYSTEM NEW ?SRG;G1
RESET w_q{C>- cR
> `Gys8 T
UNITS MM SaMg)s~B
WAVELENGTHS 3.7 UM i5w
\ $}^u5Y
COATING PROPERTIES ~~,\BhG?
1 0 'REFLECT' _5EM < Ux
0 0 'ABSORB' xrxORtJ<
kUUeyq
PARABASAL 4 q3TAWNzI0
BEAMS COHERENT DIFFRACT &z8@ rk|
WIDTHS 1.6 .Ebg>j:\
R2yiExw<
A=1 7RM$%'n \
N=32 g"c\o uSY
L=(N)*(A) uV`r_P
D1=0.625E-3 v^0D
D2=(N)*(D1) f/&gR5
!! 微阶梯镜======================= `WGT`A"
$DO -16 15 1 [U.3rcT"N
{SURFACE o( Yfnnuy
PLANE Z 0 RECTANGLE (A)/2 (L)/2 d}j%. JJK
OBJECT 'MIRROR2_?' w2_$>z
INTERFACE COATING REFLECT AIR AIR ;D&FZ|`(u
SHIFT X (A)*?+(A)/2 EE(1;] d-
SHIFT Z (D2)*? 2'Cwx-_G`
} <0 g.< n,
GROUP MIRROR2_? pSvRyb.K
SHIFT Z (L) 0sM{yGu=,
ROTATE X -90 0 0 =v]\{ .
!! DETECTOR====================== 4qXO8T#~J=
SURFACE t Sra n
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 q@8Jc[\d
OBJECT 'DETECTOR' pyYm<dn
INTERFACE COATING ABSORB AIR AIR *UhYX )J
!! SOURCE ======================= jU.z{(s
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) `w';}sQA7
SOURCE DIR 0 1 0 Vw :.'-Oi
!! !!TRACE PLOT========================= T1 >xw4uo
!!WINDOW Y Z #pO=\lJ,
!!PLOT FACETS 5 5 !!OVERLAY k/o"E
TRACE!! PLOT ZmeSm&
hQ_
!!$VIEW &~)PB
|
|fqYMhA U
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY kKL'rT6z
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 W6J%x[>Z
PIXELS (256) wd*8w$\
SPREAD NORMAL KtTv0[66
DISPLAY 7.mY@
!! FORM 0.5 Yci>'$tQ
PICTURE dJxdrs
RETURN
