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。 B F,8[|%#  
处理办法： $&C~Qti|G  
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。 n@`:"j%s_  
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。 8}^R jMgI  
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。 T
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这是我们输入的初始结构：

i.(kX`~J1  
    RLE                         ! Beginning of lens input file. ID LASER BEAM SHAPER z+k[HE^S  
    WA1 .6328                 ! Single wavelength SdJGhU  
    UNI MM                     ! Lens is in millimeters ;4!,
19AT  
    OBG .35 2                 ! Gaussian object; waist radius -.35 mm; define full aperture as 2 * 1/e**2 point. GjfPba4>  
    1    TH 22                 ! Surface 2 is 22 mm from the waist. $1F$3"k  
    2    RD -5 TH 2 GTB S     ! Guess some reasonable lens parameters; use glass type SF6 from Schott catalog SF6 !L=RhMI  
    3    UMC 0.3 YMT 5         ! Solve for the curvature of surface 3 so the marginal ray has an angle of 0.3 +IM:jrT(  
                             ! find spacing so ray height is 5 mm on next surface c=52*&  
    4    RD 20 TH 4 PIN 2     ! Guesses for surface 4 7@6B\':  
    5    UMC 0 TH 50             ! Solve for curvature of 5 so beam is collimated. C~r(*nr  
    7                         ! Surfaces 6 and 7 exist a St  
    AFOCAL                     ! because they are required for AFOCAL output. /|HVp  
    END                         ! End of lens input file.

v"K #  
    FLUX 100 P 3

"~|;XoMU  
    DD: DO MACRO FOR AIP = -1 TO 1 AB1.l hR  
    COMPOSITE                    ! Ready a composite definition. Ul`~d !3zH  
    CD1 P FLUX 0 0 AIP 0 3        ! Composite data number 1 is the flux at a relative Y- coordinate of AIP b;O@|HK&~  
                                ! (defined later) on surface 3. ayR;|S  
    = CD1
6~rO(  
    Z1 = FILE 1 Uh tk`2O  
    = 1 + Z1 f-BEfC,}'  
    ORD = FILE 1

OZ9ud ]@\  
    CHG NOP J:  T  
    9 UMC END dPtQ Sa  
ee7{5  
    PANT                        ! Start of variable parameter definitions. VLIST RAD ALL    ! Vary all radii. )dM
Xn2O  
    VLIST TH 3 5 6 7 8            ! Vary the airspaces and two thicknesses (so AEC works on those elements). END +kXj+2  
VY#:IE:T  
    AANT                        ! Start of merit function definition AEC S7A[HG;  
    ACC OSDx  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large; assign upper-limit of 150 on TOTL. r'GD  
    M 5 10 A P YA 0 0 1 0 9            ! Ask for a beam radius of 5 mm on surfaces 9 and 10 5IsRIz[`TK  
    M 5 10 A P YA 0 0 1 0 10 -2`D(xC  
    M 0 1 A P FLUX 0 0 1 0 10   ! Ask for a flux falloff of zero at several zones on 10 \dG#hH4ZD  
    M    0    1    A    P    FLUX    0    0    .98        0    10 ?u)[xEx6}+  
    M    0    1    A    P    FLUX    0    0    .97        0    10 </%n:<z4  
    M    0    1    A    P    FLUX    0    0    .96        0    10 1I1Z),  
    M    0    1    A    P    FLUX    0    0    .95        0    10 ':[:12y[  
    M    0    1    A    P    FLUX    0    0    .94        0    10 aV6l"A]  
    M    0    1    A    P    FLUX    0    0    .93        0    10 uQYBq)p|  
    M    0    1    A    P    FLUX    0    0    .92        0    10 `"#0\Wh  
    M    0    1    A    P    FLUX    0    0    .91        0    10 Bp.z6x4  
    M    0    1    A    P    FLUX    0    0    .85        0    10
<"8<<   
    M    0    1    A    P    FLUX    0    0    .8    0        10 .AzGPcJY  
    M    0    1    A    P    FLUX    0    0    .7    0        10 =q4QBAW  
    M    0    1    A    P    FLUX    0    0    .5    0        10 <r1N6(n  
    M    0    1    A    P    FLUX    0    0    .3    0        10 ?d? cD  
    GSO 0 1 5 P                    ! Control the output ray OPD over an SFAN of 5 rays. G.}Ex!8R7_  
    END                            ! End of merit function definition. _&~y{;)S  
    SNAP `B4Px|3  
    SYNO 100

LhM{d  
    CHG NOP IIW6;jS  
    13 UMC END v8<MAq  
9kkYD  
    PANT                        ! Start of variable parameter definitions. wW1E 'Vy{  
    VLIST RAD ALL                ! Vary all radii. p(5'|eqBV  
    VLIST TH ALL ,uFdhA(i@'  
    END 05+uBwH
 
xzGs%01]  
    AANT                        ! Start of merit function definition AEC HKr6h?Si^  
    ACC fR4O^6c:  
    LUL 100 1 1 A TOTL            ! Prevent the system from growing too large kp+\3z_  
    M 5 10 A P YA 0 0 1 0 LB1   ! Ask for a beam radius of 5 mm on surfaces 9 and 10 x4HVB  
    M 5 10 A P YA 0 0 1 0 LB2 j})6O!L.  
    M    0    1    A    P    FLUX    0    0    1 0    1    0       ! Ask for a flux falloff of zero at several zones k?Bc^7l:  
    M    0    1    A    P    FLUX    0    0    .98    0    LB1 m>@$T x  
    M    0    1    A    P    FLUX    0    0    .97    0    LB1 `_+j+  
    M    0    1    A    P    FLUX    0    0    .96    0    LB1 Q\>Kd N{  
    M    0    1    A    P    FLUX    0    0    .95    0    LB1 h.\9a3B:r  
    M    0    1    A    P    FLUX    0    0    .94    0    LB1 [}/\W`C  
    M    0    1    A    P    FLUX    0    0    .93    0    LB1 U73{Uv  
    M    0    1    A    P    FLUX    0    0    .92    0    LB1 bB^SD] }C  
    M    0    1    A    P    FLUX    0    0    .91    0    LB1 ^c9~~m16+  
    M    0    1    A    P    FLUX    0    0    .85    0    LB1 ?\7" A  
    M    0    1    A    P    FLUX    0    0    .8    0    LB1 sf|[oD  
    M    0    1    A    P    FLUX    0    0    .7    0    LB1 =a_
B'^`L  
    M    0    1    A    P    FLUX    0    0    .5    0    LB1 \mt0mv;c
 
    M    0    1    A    P    FLUX    0    0    .3    0    LB1 uQ;b'6Jcp  
    GSO 0 1 10 P                ! Control the output ray OPD over an SFAN of 5 rays. GSR 0 50 10 P .&53WL[D|  
Tv;|K's'  
    END                            ! End of merit function definition. hb>,\46}  
    SNAP UeVRd  
r[:)-`]b  
    SYNO 40

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    CHG ,R j{^-k  
    CFIX =$B:i>z<  
    1 TH 0  \|Qx`-  
    END +3 2"vq)_  
    DPROP P 0 0 13 SURF 3 R    RESAMPLE