SYNOPSYS 光学设计软件课程十一：球形激光光束整形器

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激光器的输出具有非均匀的高斯强度分布，并且对于某些应用，人们希望使其均匀分布。 这是激光束整形器的工作需求。 *K2fp=Ns  
处理办法： $BWA=2$  
这项工作可以通过多种方式完成。 对于具有球面的简单透镜，它需要以重新分布光的方式平衡大量的球差，降低光束中心处的能量密度，同时在边缘附近增加光束。 使用非球面表面更容易，其中人们可以更好地控制要引入的像差量，如果使用衍射光学元件，则更容易控制。 问题是后者比球面镜片贵得多，所以我们要明白我们想要一个什么样的结果。 jK-usn  
考虑到这一点，我们将尝试一种全部使用球面透镜的方法，以确定我们可以制作光束的均匀程度以及我们需要多少元件。 让我们从一个非常简单的结构开始。 PBp+(o-  
将腰半径为0.35mm的HeNe激光器转换成直径为10mm且均匀至10％以内的光束。 C9"yu&l  
这是我们输入的初始结构：

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    RLE                         ! Beginning of lens input file. ID LASER BEAM SHAPER d}(b!q9  
    WA1 .6328                 ! Single wavelength A!fRpN  
    UNI MM                     ! Lens is in millimeters <+)B8I^  
    OBG .35 2                 ! Gaussian object; waist radius -.35 mm; define full aperture as 2 * 1/e**2 point. /H<tv5mXJ  
    1    TH 22                 ! Surface 2 is 22 mm from the waist. 8c0ugM  
    2    RD -5 TH 2 GTB S     ! Guess some reasonable lens parameters; use glass type SF6 from Schott catalog SF6 NM&R\GI  
    3    UMC 0.3 YMT 5         ! Solve for the curvature of surface 3 so the marginal ray has an angle of 0.3  o C#W  
                             ! find spacing so ray height is 5 mm on next surface P~7p~ke  
    4    RD 20 TH 4 PIN 2     ! Guesses for surface 4 rEG!A87Zz  
    5    UMC 0 TH 50             ! Solve for curvature of 5 so beam is collimated. =E4~/F}9/T  
    7                         ! Surfaces 6 and 7 exist H|/U0;s  
    AFOCAL                     ! because they are required for AFOCAL output. 37nGFH`K2m  
    END                         ! End of lens input file.

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    FLUX 100 P 3

71!'k>]h  
    DD: DO MACRO FOR AIP = -1 TO 1 k9 NPC"  
    COMPOSITE                    ! Ready a composite definition. ,1|0]:  
    CD1 P FLUX 0 0 AIP 0 3        ! Composite data number 1 is the flux at a relative Y- coordinate of AIP >\5IB5'j  
                                ! (defined later) on surface 3. 1OW#_
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    = CD1 ~k780  
    Z1 = FILE 1 MgUjB~)Y  
    = 1 + Z1 e.?;mD  
    ORD = FILE 1

J1gLT $  
    CHG NOP $61j_;WF`  
    9 UMC END FCA]zR1  
?QG?F9?  
    PANT                        ! Start of variable parameter definitions. VLIST RAD ALL    ! Vary all radii. ISALR{Aq  
    VLIST TH 3 5 6 7 8            ! Vary the airspaces and two thicknesses (so AEC works on those elements). END _8'z"wF  
FvT;8ik:3  
    AANT                        ! Start of merit function definition AEC (7J (.EG2e  
    ACC >[a&,gS  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large; assign upper-limit of 150 on TOTL. ^U[yk'!Y  
    M 5 10 A P YA 0 0 1 0 9            ! Ask for a beam radius of 5 mm on surfaces 9 and 10 ]0@ 06G(y  
    M 5 10 A P YA 0 0 1 0 10 Bl!R bh\  
    M 0 1 A P FLUX 0 0 1 0 10   ! Ask for a flux falloff of zero at several zones on 10 QDpzIjJj  
    M    0    1    A    P    FLUX    0    0    .98        0    10 J'#R9NO<  
    M    0    1    A    P    FLUX    0    0    .97        0    10 mqk tM6  
    M    0    1    A    P    FLUX    0    0    .96        0    10 jpRC
6b?  
    M    0    1    A    P    FLUX    0    0    .95        0    10 [|{m/`8
C  
    M    0    1    A    P    FLUX    0    0    .94        0    10 )R@M~d-o  
    M    0    1    A    P    FLUX    0    0    .93        0    10 I!;vy/r  
    M    0    1    A    P    FLUX    0    0    .92        0    10 CWW|?  
    M    0    1    A    P    FLUX    0    0    .91        0    10 +!Lz]@9K  
    M    0    1    A    P    FLUX    0    0    .85        0    10 ".:]?Lvt  
    M    0    1    A    P    FLUX    0    0    .8    0        10 x!QA* M  
    M    0    1    A    P    FLUX    0    0    .7    0        10 ^{R.X:a  
    M    0    1    A    P    FLUX    0    0    .5    0        10 &L`yX/N2  
    M    0    1    A    P    FLUX    0    0    .3    0        10 ST7Xgma-  
    GSO 0 1 5 P                    ! Control the output ray OPD over an SFAN of 5 rays. v7@O ,%  
    END                            ! End of merit function definition. WuUT>omH  
    SNAP jhkNi`E7  
    SYNO 100

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    CHG NOP 9_I#{?  
    13 UMC END W9%B9~\G;+  
F}dq~QCzw  
    PANT                        ! Start of variable parameter definitions. r,-9]?i  
    VLIST RAD ALL                ! Vary all radii. ^#)M,.G^  
    VLIST TH ALL Cv;\cI"&  
    END v'X=|$75  
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    AANT                        ! Start of merit function definition AEC ;|H(_J=6k  
    ACC !|`vW{
v  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large FST}:*dOe5  
    M 5 10 A P YA 0 0 1 0 LB1   ! Ask for a beam radius of 5 mm on surfaces 9 and 10 ?2$0
aq  
    M 5 10 A P YA 0 0 1 0 LB2 IQA<xqX   
    M    0    1    A    P    FLUX    0    0    1 0    1    0       ! Ask for a flux falloff of zero at several zones D>).^>|q  
    M    0    1    A    P    FLUX    0    0    .98    0    LB1 8w]>SEGFs  
    M    0    1    A    P    FLUX    0    0    .97    0    LB1 ?~#{3b  
    M    0    1    A    P    FLUX    0    0    .96    0    LB1 B@@j-  
    M    0    1    A    P    FLUX    0    0    .95    0    LB1 <rAk"R^  
    M    0    1    A    P    FLUX    0    0    .94    0    LB1 ^tY$pPA  
    M    0    1    A    P    FLUX    0    0    .93    0    LB1 @!zT+W&
 
    M    0    1    A    P    FLUX    0    0    .92    0    LB1 s#2<^6  
    M    0    1    A    P    FLUX    0    0    .91    0    LB1 JU\wvP5j  
    M    0    1    A    P    FLUX    0    0    .85    0    LB1 )}i;OLw-  
    M    0    1    A    P    FLUX    0    0    .8    0    LB1 b1NB:  
    M    0    1    A    P    FLUX    0    0    .7    0    LB1 V- HO_GDo  
    M    0    1    A    P    FLUX    0    0    .5    0    LB1 `.8#q^  
    M    0    1    A    P    FLUX    0    0    .3    0    LB1 {P>%l\?  
    GSO 0 1 10 P                ! Control the output ray OPD over an SFAN of 5 rays. GSR 0 50 10 P Yt% E,U~g  
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    END                            ! End of merit function definition. ":upo/xN  
    SNAP </B5^}  
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    SYNO 40

b!ea(D!:  
    CHG 6}EC)j;Fw  
    CFIX V*U*_Y  
    1 TH 0 d|8iD`sZz  
    END &QL!Y{=Y6  
    DPROP P 0 0 13 SURF 3 R    RESAMPLE

火车污污:很有收获，谢谢楼主 (2019-02-26 15:21)  &;%z1b>F