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? .-fJ\`^mi
以下是我的ASAP代码,可以拷贝运行一下。 j2g#t
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SYSTEM NEW NSj}?hz
RESET ,Rz,[KI|
_qM'm^z5
UNITS MM MiAXbo#\
WAVELENGTHS 3.7 UM \2pJ ]
&A]*"lt|w
COATING PROPERTIES l8n#sGA %
1 0 'REFLECT' >\[sNCkf
0 0 'ABSORB' w=y!|F
A\k@9w\Ll;
PARABASAL 4 tk2B\}6
BEAMS COHERENT DIFFRACT 3]M
YHb
WIDTHS 1.6 &EV|knW
>O |hN `
A=1 {PWz:\oaD
N=32 'R99kL/.N
L=(N)*(A) ;"wU+
D1=0.625E-3 2j*\n|"}{
D2=(N)*(D1) zH}u9IR3`
!! 微阶梯镜======================= ;F"W6G
$DO -16 15 1 A<QYW,:|
{SURFACE +|r)
;>b
PLANE Z 0 RECTANGLE (A)/2 (L)/2 DTI+VY.W^
OBJECT 'MIRROR2_?' `{<2{}2M
INTERFACE COATING REFLECT AIR AIR `N;u#z
SHIFT X (A)*?+(A)/2 hQ#'_%:
SHIFT Z (D2)*? .9S
} ` L6H2:pf
GROUP MIRROR2_? [P`Q_L,+
SHIFT Z (L) (/Hq8o-Fw
ROTATE X -90 0 0 t? yMuK
!! DETECTOR====================== aG?'F`UQ
SURFACE wwmMpK}f
PLANE Y -(2*L) RECTANGLE (L)/2 (L)/2 Y[X5S{H`wj
OBJECT 'DETECTOR' G]=U=9ZI
INTERFACE COATING ABSORB AIR AIR !nU
!! SOURCE ======================= 0`3ey*
GRID RECT Y -(L) -(L)/2 (L)/2 -(L)/2 (L)/2 (256) (256) x.<^L] "
SOURCE DIR 0 1 0 ;XZ5r|V}
!! !!TRACE PLOT========================= e}-uU7O
!!WINDOW Y Z w(<;
$9
!!PLOT FACETS 5 5 !!OVERLAY L_=J(H|
TRACE!! PLOT !D7[R'RgY
!!$VIEW ig7)VKr
UW. F1)
CONSIDER ONLY DETECTOR !!CONSIDER ONLY DUMY hm&{l|u{RU
WINDOW X -(L)/2 (L)/2 Z -(L)/2 (L)/2 [="moh2*f
PIXELS (256) U"<Z^)
SPREAD NORMAL ~BaU2S@y
DISPLAY x\3tSP7Vp
!! FORM 0.5 4Q,HhqV'
PICTURE d]}
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RETURN