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光行天下 -> SYNOPSYS -> SYNOPSYS 光學(xué)設(shè)計軟件課程十三：帶有Kinoform鏡頭的激光擴(kuò)束器 [點此返回論壇查看本帖完整版本]

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optics1210

2018-09-07 14:29

SYNOPSYS 光學(xué)設(shè)計軟件課程十三：帶有Kinoform鏡頭的激光擴(kuò)束器

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在第11課中，您了解了如何使用普通球面透鏡設(shè)計激光擴(kuò)束器，并了解到需要多個透鏡元件才能獲得良好的性能。第12課采用相同的設(shè)計，使用兩個非球面元件，效果極佳。本課程將證明您可以使用DOE（衍射光學(xué)元件）。 CKR9APkv
目標(biāo)是將腰半徑為0.35mm的HeNe激光器轉(zhuǎn)換成直徑為10mm且均勻至10％以內(nèi)的光束。 p-6.:y
這是我們初始的輸入文件：

VN".NEL
    RLE                ! Beginning of lens input file. 。 S8cFD):q
    ID KINOFORM BEAM SHAPER Uh8ieb
    WA1 .6328               ! Single wavelength PJ.jgN(r
    UNI MM           ! Lens is in millimeters #FQVhgc
    OBG .35 1          ! Gaussian object; waist radius -.35 mm; define full aperture = 1/e**2 point. }wb;ulN)
    1    TH 22          ! Surface 2 is 22 mm from the waist . Arv8P P^'
    2    RD -2 TH 2 GTB S ! Guess some reasonable lens parameters; use glass type SF6 from Schott catalog Oxvw`a#
    SF6 $.cGRz
    3    TH 20          ! Surface 3 is a kinoform on side 2 of the first element 5.E 2fX
    3 USS 16          ! Defined as Unusual Surface Shape 16 (simple DOE) b>(lF%M
    CWAV .6328      ! Zones are defined as one wave phase change at this wavelengt 7U7 i2 4
    HIN 1.7988 55      ! Assume the zones are machined into the lens.  You can also apply  ! a film of a different index. lpM{@JC
    RNORM 1 u'b_zlW@
;(,Fe/wvC
    4 TH 2 GTB S )gLasR.1
    SF6 hzH5K
    4 USS 16 4%7*tVG
    CWAV .6328 eC39C2q\
    HIN 1.7988 55 /Rz,2jfRx'
    RNORM 1 [P,nW/H
         ! The first side of the second element is also a DOE 1GdgF?4
    5 CV 0 TH 50      ! Start with a flat surface 7L6M#B[)e5
    7               ! Surfaces 6 and 7 exist # 0(\s@r.
    AFOCAL           ! because they are required for AFOCAL output. K7Vr$,p
    END           ! End of lens input file.

我們給第2個表面指定了一個合理RD值。這是現(xiàn)階段還沒有DOE的非球面系數(shù)的系統(tǒng)：

光束被擴(kuò)展但沒有準(zhǔn)直，并且強(qiáng)度分布仍然是高斯輸入光束的強(qiáng)度分布。任務(wù)是找到能夠?qū)崿F(xiàn)我們兩個目標(biāo)的DOE OPD目標(biāo)。首先，讓我們將第二個透鏡的兩邊保持為平面。這是優(yōu)化MACro：

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    PANT      ! Start of variable parameter definitions. Oe!&Jma*>
    RDR .001     ! This is a very small beam, so use smaller derivative increments to start with VY lTP02|eK
    2 RAD e-CW4x
    VLIST TH 3  ! Vary the airspace eH8.O
    VY 3 G 26     ! Vary term Y**2, k}.nH"AQ
    VY 3 G 27     ! Y**4, gk#rA/x
    VY 3 G 28     ! and Y**6 IA4(^-9
p'4P2
    VY 4 G 26     ! Do the same at surface 4 jFv<]D%A[
    VY 4 G 27 \#r_H9&s6
    VY 4 G 28 "U.=A7r
~-%A@Lt
    END tK H!xit
M[{:o/]<
    AANT           ! Start of merit function definition 3\G=J
    AEC XEEbmIO*<9
    ACC (I.`bR
    LUL 150 1 1 A TOTL      ! Prevent the system from growing too large Fm':sd)'X
    M 5 1 A P YA 0 0 1 0 5     ! Ask for a beam radius of 5 mm on surface 5