球面激光光束整形器：SYNOPSYS 光学设计软件

ZypK''&oc  
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。 NiYT%K%  
处理办法： t?H sfN  
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，所以我们希望看到我们可以先做些什么。 d;nk>6<|  
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设置开始，我们将继续优化。 jx}7/  
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。 _*cKu>,O  
这是我们输入的初始结构：

~ike&k{  
    RLE                         ! Beginning of lens input file. ID LASER BEAM SHAPER fohZ&f|>  
    WA1 .6328                 ! Single wavelength =zTpDL  
    UNI MM                     ! Lens is in millimeters @~}~;}0x  
    OBG .35 2                 ! Gaussian object; waist radius -.35 mm; define full aperture as 2 * 1/e**2 point. Aho-\9/x%  
    1    TH 22                 ! Surface 2 is 22 mm from the waist. c!GJS`/  
    2    RD -5 TH 2 GTB S     ! Guess some reasonable lens parameters; use glass type SF6 from Schott catalog SF6 8)>4ZNXz  
    3    UMC 0.3 YMT 5         ! Solve for the curvature of surface 3 so the marginal ray has an angle of 0.3 A2!pbeG  
                             ! find spacing so ray height is 5 mm on next surface T
$sm}=  
    4    RD 20 TH 4 PIN 2     ! Guesses for surface 4 ehLn+tg  
    5    UMC 0 TH 50             ! Solve for curvature of 5 so beam is collimated. D!8v$(#hR  
    7                         ! Surfaces 6 and 7 exist SmAii}-jf  
    AFOCAL                     ! because they are required for AFOCAL output. wq|7sk{  
    END                         ! End of lens input file.

ktkS$  
    FLUX 100 P 3

hj\A-Yf  
    DD: DO MACRO FOR AIP = -1 TO 1 4aKppj  
    COMPOSITE                    ! Ready a composite definition. X3][C  
    CD1 P FLUX 0 0 AIP 0 3        ! Composite data number 1 is the flux at a relative Y- coordinate of AIP =?_:h`}  
                                ! (defined later) on surface 3. `dWnu3r;  
    = CD1 d
)0|Q  
    Z1 = FILE 1 I%b5a`7  
    = 1 + Z1 x=-(p}0o;<  
    ORD = FILE 1

M`7[hr  
    CHG NOP a^\F9^j  
    9 UMC END t1~k+  
| O9b  
    PANT                        ! Start of variable parameter definitions. VLIST RAD ALL    ! Vary all radii. Z78i7k}  
    VLIST TH 3 5 6 7 8            ! Vary the airspaces and two thicknesses (so AEC works on those elements). END h6bvUI+|h  
Vk*XiEfKm>  
    AANT                        ! Start of merit function definition AEC &kn?=NW  
    ACC ?NvE9+n  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large; assign upper-limit of 150 on TOTL. tc{l?7P  
    M 5 10 A P YA 0 0 1 0 9            ! Ask for a beam radius of 5 mm on surfaces 9 and 10 <FAbImE}  
    M 5 10 A P YA 0 0 1 0 10 K4o']{:U  
    M 0 1 A P FLUX 0 0 1 0 10   ! Ask for a flux falloff of zero at several zones on 10 4>2\{0r  
    M    0    1    A    P    FLUX    0    0    .98        0    10 l8:!{I?s=  
    M    0    1    A    P    FLUX    0    0    .97        0    10 Ups0Xg&{  
    M    0    1    A    P    FLUX    0    0    .96        0    10 7HQL^Q  
    M    0    1    A    P    FLUX    0    0    .95        0    10 bSn={O"M  
    M    0    1    A    P    FLUX    0    0    .94        0    10 b4EUrSL  
    M    0    1    A    P    FLUX    0    0    .93        0    10 -[&Z{1A4x4  
    M    0    1    A    P    FLUX    0    0    .92        0    10 j'Q0DF=GV  
    M    0    1    A    P    FLUX    0    0    .91        0    10 )T?BO  
    M    0    1    A    P    FLUX    0    0    .85        0    10 xFJT&=Af W  
    M    0    1    A    P    FLUX    0    0    .8    0        10  !VXy67  
    M    0    1    A    P    FLUX    0    0    .7    0        10 wkx#WC  
    M    0    1    A    P    FLUX    0    0    .5    0        10 .t9`e=%  
    M    0    1    A    P    FLUX    0    0    .3    0        10 2Dt^W.!  
    GSO 0 1 5 P                    ! Control the output ray OPD over an SFAN of 5 rays. k<Xb<U  
    END                            ! End of merit function definition. Z15=vsV  
    SNAP &y7=tEV  
    SYNO 100

7h2/8YUgQ  
    CHG NOP `sy_'`i>X  
    13 UMC END /?0|hi<_$  
"=KFag  
    PANT                        ! Start of variable parameter definitions. I[gPW7&S@  
    VLIST RAD ALL                ! Vary all radii. XD?]+  
    VLIST TH ALL NPFI^Uj#A  
    END VKw.g@BY  
,aq>9\pi  
    AANT                        ! Start of merit function definition AEC +?*.Emzl@  
    ACC x^i97dZS^"  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large Jt0/*^'  
    M 5 10 A P YA 0 0 1 0 LB1   ! Ask for a beam radius of 5 mm on surfaces 9 and 10 M?;YpaSe+  
    M 5 10 A P YA 0 0 1 0 LB2 ^|vP").aQm  
    M    0    1    A    P    FLUX    0    0    1 0    1    0       ! Ask for a flux falloff of zero at several zones 4~&X]/_'  
    M    0    1    A    P    FLUX    0    0    .98    0    LB1 p&0 G  
    M    0    1    A    P    FLUX    0    0    .97    0    LB1 &~x|w6M]J  
    M    0    1    A    P    FLUX    0    0    .96    0    LB1 6 {F#_.  
    M    0    1    A    P    FLUX    0    0    .95    0    LB1 =3rf}bl2  
    M    0    1    A    P    FLUX    0    0    .94    0    LB1 r+6 DlT a  
    M    0    1    A    P    FLUX    0    0    .93    0    LB1 [} d39  
    M    0    1    A    P    FLUX    0    0    .92    0    LB1 f_;tFP B  
    M    0    1    A    P    FLUX    0    0    .91    0    LB1
+W$uHQq  
    M    0    1    A    P    FLUX    0    0    .85    0    LB1 F9tWJJUsr  
    M    0    1    A    P    FLUX    0    0    .8    0    LB1 |Q@(<'8=  
    M    0    1    A    P    FLUX    0    0    .7    0    LB1 Im};wJ&
 
    M    0    1    A    P    FLUX    0    0    .5    0    LB1 G(o6/  
    M    0    1    A    P    FLUX    0    0    .3    0    LB1 0r[a$p>`  
    GSO 0 1 10 P                ! Control the output ray OPD over an SFAN of 5 rays. GSR 0 50 10 P 0"N4WH O  
cG3tn&AXi  
    END                            ! End of merit function definition. ,%zE>^~  
    SNAP foY]RkW9  
N6T  
    SYNO 40

Qw_> l}k/  
    CHG .<YfnW5/K  
    CFIX {A%&D^o)  
    1 TH 0 Uxe]T  
    END :RYYjmG5;  
    DPROP P 0 0 13 SURF 3 R    RESAMPLE