球面激光光束整形器：SYNOPSYS 光学设计软件

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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。 %y;E1pva  
处理办法： *$mDu,'8  
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。 H)tnxD0)  
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。 S(<r-bV<  
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。 jsL\{I^>  
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 HO%atE$>  
    WA1 .6328                 ! Single wavelength ih
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    UNI MM                     ! Lens is in millimeters __<u!;f  
    OBG .35 2                 ! Gaussian object; waist radius -.35 mm; define full aperture as 2 * 1/e**2 point. <Hw)},_*  
    1    TH 22                 ! Surface 2 is 22 mm from the waist. q y"VrR  
    2    RD -5 TH 2 GTB S     ! Guess some reasonable lens parameters; use glass type SF6 from Schott catalog SF6 +^1E0@b%  
    3    UMC 0.3 YMT 5         ! Solve for the curvature of surface 3 so the marginal ray has an angle of 0.3 rV.
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                             ! find spacing so ray height is 5 mm on next surface Z |wM  
    4    RD 20 TH 4 PIN 2     ! Guesses for surface 4 \-3\lZ3qj  
    5    UMC 0 TH 50             ! Solve for curvature of 5 so beam is collimated. |d}f\a`  
    7                         ! Surfaces 6 and 7 exist 2]W"sT[  
    AFOCAL                     ! because they are required for AFOCAL output. c^0YuBps[  
    END                         ! End of lens input file.

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    FLUX 100 P 3

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    DD: DO MACRO FOR AIP = -1 TO 1 ,Y 1&[  
    COMPOSITE                    ! Ready a composite definition. -=_bXco}  
    CD1 P FLUX 0 0 AIP 0 3        ! Composite data number 1 is the flux at a relative Y- coordinate of AIP #Ezq}F8Y  
                                ! (defined later) on surface 3. 0\3mS{s  
    = CD1 2D|2/ >[  
    Z1 = FILE 1 *h6Lh]7  
    = 1 + Z1 eHr|U$Rpo  
    ORD = FILE 1

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    CHG NOP E({+2}=1  
    9 UMC END &' ,A2iG  
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    PANT                        ! Start of variable parameter definitions. VLIST RAD ALL    ! Vary all radii. JNhHQvi\  
    VLIST TH 3 5 6 7 8            ! Vary the airspaces and two thicknesses (so AEC works on those elements). END WT(inf[  
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    AANT                        ! Start of merit function definition AEC
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    ACC 
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    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large; assign upper-limit of 150 on TOTL. a& >(*PQ  
    M 5 10 A P YA 0 0 1 0 9            ! Ask for a beam radius of 5 mm on surfaces 9 and 10 z{h#l!Edh  
    M 5 10 A P YA 0 0 1 0 10 8`bQ,E+2  
    M 0 1 A P FLUX 0 0 1 0 10   ! Ask for a flux falloff of zero at several zones on 10 f8]Qn8  
    M    0    1    A    P    FLUX    0    0    .98        0    10 Hx;ij?  
    M    0    1    A    P    FLUX    0    0    .97        0    10 LxqK@Q<B  
    M    0    1    A    P    FLUX    0    0    .96        0    10 5rG&Z5  
    M    0    1    A    P    FLUX    0    0    .95        0    10 .Q'/e>0  
    M    0    1    A    P    FLUX    0    0    .94        0    10 Y|ONCc  
    M    0    1    A    P    FLUX    0    0    .93        0    10 cd8ZZ
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    M    0    1    A    P    FLUX    0    0    .92        0    10 P'o:Vhm_H  
    M    0    1    A    P    FLUX    0    0    .91        0    10 cSdkhRAn  
    M    0    1    A    P    FLUX    0    0    .85        0    10 oK3uGPi  
    M    0    1    A    P    FLUX    0    0    .8    0        10 +uR|0Jo8X  
    M    0    1    A    P    FLUX    0    0    .7    0        10 u<8 f;C_  
    M    0    1    A    P    FLUX    0    0    .5    0        10 piIr.]  
    M    0    1    A    P    FLUX    0    0    .3    0        10 j.C)KwelBS  
    GSO 0 1 5 P                    ! Control the output ray OPD over an SFAN of 5 rays. .Z=4,m
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    END                            ! End of merit function definition. D>& ;K{!  
    SNAP ?O1:-vpZ  
    SYNO 100

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    CHG NOP e@k`C{{C]o  
    13 UMC END QusEWq)}<  
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    PANT                        ! Start of variable parameter definitions. aQax85  
    VLIST RAD ALL                ! Vary all radii. /EY^ui  
    VLIST TH ALL bXcDsP$.  
    END
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    AANT                        ! Start of merit function definition AEC c"ukV_6~J  
    ACC >M.?qs4  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large A`4Di8'Me  
    M 5 10 A P YA 0 0 1 0 LB1   ! Ask for a beam radius of 5 mm on surfaces 9 and 10 t3 AZS0  
    M 5 10 A P YA 0 0 1 0 LB2 ?sl 7C gl  
    M    0    1    A    P    FLUX    0    0    1 0    1    0       ! Ask for a flux falloff of zero at several zones ?D
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    M    0    1    A    P    FLUX    0    0    .98    0    LB1 8kZ~  
    M    0    1    A    P    FLUX    0    0    .97    0    LB1 &fBLPF%6  
    M    0    1    A    P    FLUX    0    0    .96    0    LB1 2A3;#v  
    M    0    1    A    P    FLUX    0    0    .95    0    LB1 Uo{h. .7?  
    M    0    1    A    P    FLUX    0    0    .94    0    LB1 ]2n&DJu  
    M    0    1    A    P    FLUX    0    0    .93    0    LB1 W(*:8}m,p  
    M    0    1    A    P    FLUX    0    0    .92    0    LB1 {8M=[4_`l  
    M    0    1    A    P    FLUX    0    0    .91    0    LB1 \GtZX!0  
    M    0    1    A    P    FLUX    0    0    .85    0    LB1 E-,74B&H  
    M    0    1    A    P    FLUX    0    0    .8    0    LB1 4!lbwqo  
    M    0    1    A    P    FLUX    0    0    .7    0    LB1 RVN"lDGA  
    M    0    1    A    P    FLUX    0    0    .5    0    LB1 y:!MWZ  
    M    0    1    A    P    FLUX    0    0    .3    0    LB1 U*8;ZXi  
    GSO 0 1 10 P                ! Control the output ray OPD over an SFAN of 5 rays. GSR 0 50 10 P mi|O)6>8n  
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    END                            ! End of merit function definition. mwFI89J'  
    SNAP 7BCCQsz<  
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    SYNO 40

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    CHG );$Uf!v4  
    CFIX =mCUuY#  
    1 TH 0 KdFQlQaj  
    END 1?HUXN#,  
    DPROP P 0 0 13 SURF 3 R    RESAMPLE