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? gDH x+"?
以下是我的ASAP代码,可以拷贝运行一下。 5M3QRJ!
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SYSTEM NEW >2ct1_
RESET !eW<4jYB
rW6LMkt72
UNITS MM W'[!4RQL
WAVELENGTHS 3.7 UM /*[a>B4-q
3WhJ,~o-y
COATING PROPERTIES /dO&r'!:
1 0 'REFLECT' `7NgQ*g.d/
0 0 'ABSORB' HH dc[pJ0D
3 Xy>kG}
PARABASAL 4 >Kxl+F
BEAMS COHERENT DIFFRACT 9P]TIV.
WIDTHS 1.6 Z@>>ZS1Do
jRGG5w}
A=1
:geXplTx
N=32 *op7:o_
L=(N)*(A) cWm.']
D1=0.625E-3 YWTo]DJV
D2=(N)*(D1) {^~{X$YI
!! 微阶梯镜======================= bF3j* bpO"
$DO -16 15 1 r J&1[=s
{SURFACE lps
PLANE Z 0 RECTANGLE (A)/2 (L)/2 4;_.|!LN
OBJECT 'MIRROR2_?' z*FlZLHY
INTERFACE COATING REFLECT AIR AIR 4>(?R[:p)
SHIFT X (A)*?+(A)/2 Re=bJ|wo
SHIFT Z (D2)*? a].Bn#AH!C
} !0cfz5t
GROUP MIRROR2_? S_^ "$j
SHIFT Z (L) r/PsFv{8
ROTATE X -90 0 0 Ros5]5=dP
!! DETECTOR====================== X,~8) W
SURFACE eudPp"Km
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 W2REwUps
OBJECT 'DETECTOR' [QeKT8
INTERFACE COATING ABSORB AIR AIR 3b|.L
Jz+
!! SOURCE ======================= ^ K/B[8
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) BWd?a6nU}
SOURCE DIR 0 1 0 I@.qon2V
!! !!TRACE PLOT========================= CnAh Ef)b
!!WINDOW Y Z e{"d6pF=
!!PLOT FACETS 5 5 !!OVERLAY 6~^+</?
TRACE!! PLOT o#;w>-
!!$VIEW L&l>?"_
lVMAab
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY 5"{wnnY%K}
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 18a6i^7
PIXELS (256) CvlAn7r,@
SPREAD NORMAL )U8F6GIC&}
DISPLAY i3YAK$w;&
!! FORM 0.5 Rd 2*
PICTURE enZW2o97c
RETURN