Abstract:
The invention relates to a large-apertured microlithography projection lens. The diaphragm error is also systematically corrected, so that the pupil plane is slightly curved and the lens can be stopped down without comprising quality. The system diaphragm of the projection lens is located in the area of the last lens cluster of positive refractive power on the image side. The telecentrics of the projection lens remain stable on the image side during stopping down.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    Not applicable  
         STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT  
         [0002]    Not applicable  
         BACKGROUND OF THE INVENTION  
         [0003]    The invention relates to a microlithographic projection lens, in which the system diaphragm is arranged in the region of the last bulge on the image side, and has a numerical aperture of more than 0.65 and an image field diameter of more than 20 mm. Such lenses are typically characterized by a resolution below 0.5 micrometers with minimal distortion and at least image-side telecentricity.  
           [0004]    The microlithographic reduction lens of the category concerned is a microlithographic projection lens having a system diaphragm arranged in a region of a last bulge on an image side, and having an image-side numerical aperture of more than 0.65 and an image field diameter of more than 20 mm, and is a purely refractive high performance lens such as is required for high resolution microlithography, particularly in the DUV wavelength region.  
         TECHNICAL FIELD  
         [0005]    Such refractive lenses with two beam waists have already been described in the article by E. Glatzel, “New Lenses for Microlithography”, SPIE, Vol. 237, 310 (1980), and have been constantly developed since then. Lenses of the Carl Zeiss company of the category concerned are sold in PAS wafer steppers and wafer scanners of the ASML company, Netherlands.  
           [0006]    Such a lens by the Tropel company dating from 1991 is shown in FIG. 16 of J. H. Bruning, “Optical Lithography—Thirty Years and Three Orders of Magnitude”, SPIE, Vol. 3049, 14-27 (1997). Numerous variants of projection lenses of the category concerned can be found in patent applications, such as EP 0 712 019-A (U.S. Ser. No. 337,649 of Nov. 10, 1994), EP 0 717 299-A, EP 0 721 150-A, EP 0 732 605-A, EP 0 770 895-A, EP 0 803 755-A (U.S. Pat. No. 5,781,278), and EP 0 828 172-A.  
           [0007]    Similar objectives with somewhat smaller numerical aperture are also to be found in SU 1 659 955-A, EP 0 742 492-A (FIG. 3), U.S. Pat. No. 5,105,075 (FIGS. 2 and 4), U.S. Pat. No. 5,260,832 (FIG. 9) and DD 299 017-A.  
           [0008]    In the cited documents, the diaphragm of course has many different situations, in particular in the region of the second waist.  
           [0009]    The possibility of stopping down to about 60-80% of the maximum image-side numerical aperture is as a rule provided in high-aperture microlithography projection lenses.  
           [0010]    This possibility of stopping down is explicitly mentioned in DE 199 02 236 A1, which was first published after the priority date of the present application. In this, and also in DE 198 18 444 A1, the use of aspheric lenses is also provided, and indeed at least one aspheric in the region of the second waist (fourth lens group). The embodiments of FIGS.  1 - 3  of the priority application DE 198 55 108.8 show a relatively strongly curved pupil plane with an axial offset of about 25 mm between the optical axis and the edge of the pencil of rays at full aperture. Correspondingly, expensive diaphragm structures are required for stopping down.  
           [0011]    The priority applications DE 198 55 108.8, DE 198 55 157.6 and DE 199 22 209.6, DE 199 42 281.8, with their disclosures and including the claims, are incorporated herein by reference as part of the disclosure of the present patent application.  
           [0012]    As “pupil plane” there is understood, in the sense of the present patent application, the curved surface of the pupil or, fourier transformed, of the image plane, as it is constituted real due to imaging errors of the lens arrangement. The edge of the aperture diaphragm of the system must lie on this surface if vignetting effects are to be prevented. If the real aperture diaphragm is made narrower and wider in a planar geometrical plane, the freedom from vignetting is approximately the better, the less the pupil plane departs from a planar surface.  
         SUMMARY OF THE INVENTION  
         [0013]    The invention has as its object the provision of lenses of the category concerned with well corrected pupils, making possible cleaner stopping down without disturbing effects and with a simple diaphragm structure.  
           [0014]    This object is attained by a projection lens of the category concerned wherein a pupil plane is curved over a cross section of a pencil of rays by a maximum of 20 mm.  
           [0015]    This object is also attained by a projection lens of the category concerned wherein the lens has a telecentricity deviation of less than ±4 mrad, preferably less than ±3 mrad of the geometric central beam, on stopping down to 0.8 times the image side numerical aperture. This object is also attained by a projection lens of the category concerned wherein a tangential image dishing of a pupil image in a diaphragm space is corrected to less than 20 mm, preferably less than 15 mm.  
           [0016]    According to the invention, the pupil plane is curved by at most 20 mm, but preferably by less than 15 mm.  
           [0017]    The image-side telecentricity is also well kept very stable, even when stopping down to 0.8 times the nominal (maximum) image-side numerical aperture; measured at the geometrical central beam, it is below ±4 mrad.  
           [0018]    Since the image field curvature of the front or rear lens portion cannot be exactly corrected alone (or at all events not at a justifiable expense, since it can only be influenced by means of the distribution of refractive index), the image error compromise in the image plane is chosen so that the image field curvature is partially compensated by astigmatism (which can be adjusted by means of targeted lens curvature with unchanged refractive index), at least in the tangential imaging relevant for the diaphragm structure.  
           [0019]    According to the invention, apart from the optical correction of the lens, the tangential image dishing of the pupil imaging in the diaphragm space is corrected to less than 20 mm. Imaging of the pupil plane is thus explicitly taken into account in the image error compromise of the lens.  
           [0020]    A negative lens is required in the space behind the pupil plane for the correction of spherical aberration in projection lenses of the category concerned.  
           [0021]    According to the invention, the pupil correction according to the invention is now attained with the presence of a pupil-side concave meniscus, and makes possible a good correction of all imaging errors. The flatter the diverging image-side radius of the negative lens, the more favorable this lens is for the pupil correction.  
           [0022]    A diaphragm position according to the invention is clearly away from the second waist, and is also different from DE 199 02 336 A1 and from other documents of the prior art.  
           [0023]    The beam deflection in this region of the third bulge with many weak positive lenses results in minimum spherical under-correction and thus makes possible weak negative lenses, which further relaxes the correction of the pupil plane. The variation of the image errors when stopping down or at different illumination settings is further reduced as a whole by these measures.  
           [0024]    The spherically over-correcting air space advantageously provided according to the invention and having a middle thickness greater than the edge thickness can be arranged in the neighborhood of the negative meniscus.  
           [0025]    An aspheric lens is arranged in the region of the first waist. Aspherics in the region of the second waist can be dispensed with, while in the state of the art according to DE 199 02 336 A1 and DE 198 18 444 A1 they are to be arranged exactly there.  
           [0026]    According to the invention, the material of the lenses is quartz glass and/or fluoride crystals, the lenses then becoming suitable for the DUV/VUV region, in particular at the wavelengths of 248 nm, 193 nm, and 157 nm. Fluoride crystals are CaF 2 , BaF 2 , SrF 2 , NaF and LiF. Further information on this may be found in DE 199 08 544.  
           [0027]    The projection lens according to the invention has two waists and three bulges, as in the embodiment examples. This makes possible a very good Petzval correction at exacting values of the aperture and field.  
           [0028]    A projection illumination device with a lens according to the invention and a microlithographic production process therewith.  
           [0029]    The possibility, optimized according to the invention, provides for the application of exposures with different kinds of illumination and/or numerical aperture. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0030]    The invention is described in more detail with the aid of the embodiment examples according to the drawing and the tables.  
         [0031]    [0031]FIG. 1 shows qualitatively a projection exposure device according to the invention.  
         [0032]    [0032]FIG. 2 shows the lens section of a 103 nm quartz glass/CaF 2  projection lens with NA=0.70.  
         [0033]    [0033]FIG. 3 shows the lens section through a second lens arrangement, which has two aspheric lens surfaces;  
         [0034]    [0034]FIG. 4 shows the lens section through a third lens arrangement, which has three aspheric surfaces;  
         [0035]    [0035]FIGS. 5 a - 5   g  show a representation of tangential transverse aberrations;  
         [0036]    [0036]FIGS. 6 a - 6   g  show a representation of sagittal transverse aberrations;  
         [0037]    [0037]FIGS. 7 a - 7   f  show a representation of groove error, using sections;  
         [0038]    [0038]FIG. 8 shows the lens section through a fourth lens arrangement for 248 nm with NA=0.70. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0039]    The principle of the construction of a projection exposure device will first be described using FIG. 1. The projection exposure device  1  has an illuminating device  3  and a projection lens  5 . The projection lens includes a lens arrangement  19  with an aperture diaphragm AP, an optical axis  7  being defined through the lens arrangement  19 . A mask  9  is arranged between the illuminating device  3  and the projection lens  5 , and is held in the beam path by a mask holder  11 . Such masks  9  used in microlithography have a microstructure which is imaged on a reduced scale on an image plane  13  by means of the projection lens  5 . A substrate or a wafer  15 , positioned by a substrate holder  17 , is held in the image plane  13 .  
         [0040]    This projection lens  5 , and in particular its lens arrangement  19 , designed for more stringent requirements on image quality and on resolution, is described in more detail hereinafter.  
         [0041]    The embodiment example according to FIG. 2 and Table 1 is a projection lens with purely spherical lenses, as a quartz glass/CaF 2  partial achromat for 193 nm excimer laser with 0.5 pm bandwidth. The image-side NA is 0.70; the image field diameter is 29.1 mm. The pupil plane with the aperture stop AS is situated far back from the second waist in the region of an intermediate constriction of the third bulge. Its curvature is 15.8 mm at a light pencil diameter of 212 mm.  
         [0042]    For the determination of the curvature of the pupil plane, the tangential image shell of the pupil image in the diaphragm space is determined such that the axial amount of image deviation, produced between the image plane and the pupil plane by the lens portion, of a parallel beam passing at the aperture angle through the image field is determined as compared with the image of a parallel beam parallel to the axis. The not large sagittal value for stopping down and vignetting is 26.5 mm here, and thus shows the introduced astigmatism.  
         [0043]    With stopping down to NA=0.56, the lens shows a deviation from telecentricity of the geometric central beam of 3 mrad.  
         [0044]    It would be particularly valuable to design this lens arrangement for a small diameter of the CaF 2  lenses, since their availability is restricted.  
         [0045]    The examples of FIGS. 3 and 4 have aspherics. These aspheric surfaces are described by the equation  
         P        (   h   )       =           δ   *     h   2         1   +     √   1     -       (     1   -   EX     )     *     δ   2     *     h   2           +     C1h   4     +   …   +       C   n          h       2      n     -   2                     with                 δ       =     1   /   R                             
 
         [0046]    where P is the arrow height as a function of the radius h (height from the optical axis  7 ) with the aspheric constants C 1 -C n  given in the Tables. R is the vertex radius given in the Tables.  
         [0047]    In FIG. 3 and Table 2, a quartz glass lens arrangement  19  designed for the wavelength λ=248 nm is shown in section. This lens arrangement  19  with NA=0.75 and image field diameter 27.2 mm has two aspheric lens surfaces  27 ,  29 . The first aspheric lens surface  27  is arranged on the image side on the lens L 210 . It could also be provided that this second aspheric lens surface  29  is arranged on the side of the lens L 211  facing toward the illuminating device. The two lenses L 210  and L 211  are predetermined to receive the aspheric lens surface  27 . It can also be provided that a meniscus lens is provided instead of the lenses L 210  and L 211 , and has an aspheric lens surface. The second aspheric lens surface  29  is arranged in the end region of the first lens group, on the side of the lens L 205  remote from the illuminating device  8 . It can also be provided that this aspheric lens surface  29  is arranged on the lens  206  following thereafter, in the beginning of the second lens group.  
         [0048]    A particularly large effect is obtained on arranging the aspherics  27 ,  29  on lens surfaces at which the incident rays include a large angle with the respective surface normals. In this case, it is particularly the large variation of the angle of incidence which is of importance. In FIG. 10, the value of sin i at the aspheric lens surface  31  reaches a value of up to 0.82. As a result of this, the mutually facing surfaces of the lenses L 210 , L 211  have in this embodiment example a greater influence on the course of the rays in comparison to the respective other lens surface of the corresponding lens L 210 , L 211 .  
         [0049]    No aspheric is provided in the region of the second waist, lens group LG 4 .  
         [0050]    With a length of 1,000 mm and a maximum lens diameter of 237.5 mm, this lens arrangement has a numerical aperture of 0.75 at a wavelength of 248.38 mn. The image field diagonal is 27.21 mm. A structure width of 0.15 μm can be resolved. The greatest deviation from the ideal wavefront is 13.0 mλ. The exact lens data with which these performance data are attained are given in Table 2.  
         [0051]    The pupil plane intersects the optical axis at AP. Its curvature is 12.8 mm. A stopping down to NA=0.60 is possible without loss of quality with a diaphragm situated in the plane AP. The deviation from telecentricity of the geometric central beam is then about 1.5 mrad.  
         [0052]    A further embodiment of a lens arrangement  19  for the wavelength 248.38 nm is shown in FIG. 4 and Table 3. With an image-side NA=0.77, the image field diameter is 27.2 mm.  
         [0053]    This lens arrangement  19  has three lenses L 305 , L 310 , L 328 , which have respective aspheric surfaces  27 ,  29 ,  31 . The aspheric lens surfaces  27 ,  29  are left in the positions given by FIG. 3. The coma of middle order for the image field zone can be adjusted by means of the aspheric lens surface  27 . The repercussions on sections in the tangential direction and sagittal direction are small.  
         [0054]    The additional aspheric lens surface  31  is arranged on the mask side on the lens L 328 . This aspheric lens surface  31  supports the coma correction to the image field edge.  
         [0055]    By means of these three aspheric lens surfaces  27 ,  29 ,  31 , at a wavelength of 248.34 nm, a length of only 1,000 mm, and a maximum lens diameter of 247.2 mm, there are attained the further increased numerical aperture of 0.77 and a structure width of 0.14 μm which can be well resolved in the whole image field. The maximum deviation from the ideal wavefront is 12.0 mλ.  
         [0056]    In order to keep the diameter of the lenses in LG 5  small, and in order for an advantageous Petzval sum, which is to be kept at nearly zero, for the system, the three lenses L 312 , L 313 , L 314  are enlarged in the third lens group LG 3 . For the provision of the required axial constructional space for these three lenses L 312 -L 314 , the thicknesses, and hence the diameter, of other lenses are reduced, particularly of the lenses of the first group LG 1 . This is an excellent way to accommodate very large image fields and apertures in a restricted constructional space.  
         [0057]    The high image quality attained by this lens arrangement is to be gathered from FIGS. 5 a - 5   g , FIGS. 6 a - 6   g , and FIGS. 7 a - 7   f.    
         [0058]    [0058]FIGS. 5 a - 5   g  give the meridional transverse aberrations DYM for the image heights Y′ (in mm). All show an outstanding course up to the highest DW′.  
         [0059]    [0059]FIGS. 6 a - 6   g  give the sagittal transverse aberrations DZS as a function of the half aperture angle DW′.  
         [0060]    [0060]FIGS. 7 a - 7   f  give the groove error DYS for the same image heights; it is nearly zero throughout.  
         [0061]    The exact lens data can be gathered from Table 3; the aspheric lens surfaces  27 ,  29 ,  31  have a considerable contribution to the high image quality which can be guaranteed.  
         [0062]    The curvature of the pupil plane AP amounts to 14.6 mm at full aperture. The deviation from telecentricity on stopping down to NA=0.62 is 1.5 mrad, determined as in the preceding examples.  
         [0063]    A further lens arrangement for the wavelength 248 nm is shown in FIG. 8 and Table 4.  
         [0064]    This example is furthermore constructed purely spherically. It is particularly designed so that the distortion and the further imaging errors remain minimal with substantial stopping down, even with different kinds of illumination (different degree of coherence, annular aperture illumination, quadrupole illumination). The pupil plane is corrected to a curvature of 18.5 mm at full aperture.  
         [0065]    Also it comes about here that the curved image of the pupil was substantially compensated by targeted correction of the astigmatism in the tangential section.  
         [0066]    The air lens between the lenses  623 ,  624 , the splitting of the negative meniscus into two lenses  624 ,  625 , and the position of the pupil plane at AS markedly separated by two positive lenses from the second waist ( 617 ), contribute to its leveling.  
         [0067]    In a high-aperture projection lens for microlithography, the diaphragm errors are accordingly systematically corrected, so that an only slightly curved pupil plane makes stopping down possible without a loss of quality.  
         [0068]    As already mentioned, the embodiment examples are not limitative for the subject of the invention.  
                                                           TABLE 1                           λ = (193 nm)            No.   r (mm)   d (mm)   Glass   H max  (mm)                     0   ∞   15.691       64       21   −154.467   11.998   SiO 2     64           446.437   12.272       73       22   −723.377   25.894   SiO 2     74           −222.214   .824       80       23   920.409   26.326   SiO 2     89           −287.371   .750       90       24   499.378   30.073   SiO 2     94           −358.998   .751       94       25   238.455   27.454   SiO 2     90           −3670.974   .750       89       26   182.368   13.402   SiO 2     81           115.264   31.874       72       27   −710.373   13.095   SiO 2     72           −317.933   2.550       71       28   −412.488   8.415   SiO 2     69           132.829   32.913       65       29   −184.651   11.023   SiO 2     66           2083.916   28.650       71       30   −120.436   10.736   SiO 2     72           −629.160   16.486       86       31   −213.698   24.772   SiO 2     89           −151.953   .769       95       32   11013.497   48.332   SiO 2     115           −202.880   .750       118       33   −1087.551   22.650   SiO 2     122           −483.179   .750       124       34   1797.628   23.724   SiO 2     125           −1285.887   .751       125       35   662.023   23.589   SiO 2     124           45816.292   .750       123       36   361.131   22.299   SiO 2     119           953.989   .750       117       37   156.499   49.720   CaF 2     107           2938.462   .154       103       38   377.619   8.428   SiO 2     94           123.293   40.098       80       39   −425.236   10.189   SiO 2     78           413.304   18.201       74       40   −302.456   6.943   SiO 2     73           190.182   46.542       73       41   −109.726   9.022   SiO 2     73           −1968.186   5.547       89       42   −765.656   37.334   CaF 2     90           −146.709   .753       94       43   925.552   49.401   CaF 2     108           −193.743   .847       109       44   507.720   22.716   CaF 2     105           −1447.552   21.609       104       45   −250.873   11.263   SiO 2     104           314.449   2.194       105       46   316.810   28.459   CaF 2     106           −1630.246   4.050       106       AS   Diaphragm   15.000       106       47   312.019   45.834   CaF 2     108           −388.881   11.447       108       48   −242.068   14.119   SiO 2     107           312.165   4.687       112       49   327.322   49.332   SiO 2     114           −372.447   14.727       115       50   −234.201   26.250   SiO 2     115           −226.616   .850       118       51   203.673   45.914   SiO 2     113           −3565.135   .751       111       52   157.993   29.879   SiO 2     94           431.905   14.136       90       53   −1625.593   12.195   SiO 2     88           230.390   .780       76       54   124.286   66.404   SiO 2     71           538.229   1.809       46       55   778.631   4.962   CaF 2     45           43.846   2.050       34       56   43.315   23.688   CaF 2     33           1056.655   2.047       29       P2   ∞   2.000   CaF 2     27           ∞   12.000       26       IM   ∞           14                                                                          
 
         [0069]    [0069]                                                           TABLE 2                           m736a            Lens   Radius   Thickness   Glasses   1/2 lens diameter                        infinity   16.6148       60.752       L201   −140.92104   7.0000   SiO 2     61.267           −4944.48962   4.5190       67.230       L202   −985.90856   16.4036   SiO 2     68.409           −191.79393   .7500       70.127       L203   18376.81346   16.5880   SiO 2     73.993           −262.28779   .7500       74.959       L204   417.82018   21.1310   SiO 2     77.129           −356.76055   .7500       77.193       L205   185.38468   23.3034   SiO 2     74.782           −1198.61550   A7500       73.634       L206   192.13950   11.8744   SiO 2     68.213           101.15610   27.6353       61.022       L207   −404.17514   7.0000   SiO 2     60.533           129.70591   24.1893       58.732       L208   −235.98146   7.0584   SiO 2     59.144           −203.88450   .7500       60.201       L209   −241.72595   7.0000   SiO 2     60.490           196.25453   33.3115       65.017       L210   −122.14995   7.0000   SiO 2     66.412           −454.65265   A 10.8840       77.783       L211   −263.01247   22.6024   SiO 2     81.685           −149.71102   1.6818       86.708       L212   −23862.31899   43.2680   SiO 2     104.023           −166.87798   .7500       106.012       L213   340.37670   44.9408   SiO 2     115.503           −355.50943   .7500       115.398       L214   160.11879   41.8646   SiO 2     102.982           4450.50491   .7500       100.763       L215   172.51429   14.8261   SiO 2     85.869           116.88490   35.9100       74.187       L216   −395.46894   7.0000   SiO 2     72.771           178.01469   28.0010       66.083       L217   −176.03301   7.0000   SiO 2     65.613           188.41213   36.7224       66.293       L218   −112.43820   7.0059   SiO 2     66.917           683.42330   17.1440       80.240       L219   −350.01763   19.1569   SiO 2     82.329           −194.58551   .7514       87.159       L220   −8249.50149   35.3656   SiO 2     99.995           −213.88820   .7500       103.494       L221   657.56358   31.3375   SiO 2     114.555           −428.74102   .0000       115.245           infinity   2.8420       116.016           diaphragm   .0000       116.016       L222   820.30582   27.7457   SiO 2     118.196           −520.84842   18.4284       118.605       L223   330.19065   37.7586   SiO 2     118.273           −672.92481   23.8692       117.550       L224   −233.67936   10.0000   SiO 2     116.625           −538.42627   10.4141       117.109       L225   −340.26626   21.8583   SiO 2     116.879           436.70958   .7500       117.492       L226   146.87143   34.5675   SiO 2     100.303           −224.85666   .7500       97.643       L227   135.52861   29.8244   SiO 2     86.066           284.57463   18.9234       79.427       L228   −7197.04545   11.8089   SiO 2     72.964           268.01973   .7500       63.351       L229   100.56453   27.8623   SiO 2     56.628           43.02551   2.0994       36.612       L230   42.30652   63.9541   SiO 2     36.023           262.65551   1.9528       28.009           Infinity   12.000       27.482           Infinity           13.602                                                                                                                                                            
         [0070]    [0070]                                                     TABLE 3                       Lens   Radius   Thickness   Glasses   1/2 lens diameter                                    Infinity   17.8520       60.958       L301   −131.57692   7.0000   SiO 2     61.490           −195.66940   .7500       64.933       L302   −254.66366   8.4334   SiO 2     65.844           −201.64480   .7500       67.386       L303   −775.65764   14.0058   SiO 2     69.629           −220.44596   .7500       70.678       L304   569.58638   18.8956   SiO 2     72.689           −308.25184   .7500       72.876       L305   202.68033   20.7802   SiO 2     71.232           −1120.20883   A7500       70.282       L306   203.03395   12.1137   SiO 2     65.974           102.61512   26.3989       59.566       L307   −372.05336   7.0000   SiO 2     59.203           144.40889   23.3866       58.326       L308   −207.93626   7.0303   SiO 2     58.790           −184.65938   .7500       59.985       L309   −201.97720   7.0000   SiO 2     60.229           214.57715   33.1495       65.721       L310   −121.80702   7.0411   SiO 2     67.235           −398.26353   A 9.7571       79.043       L311   −242.40314   22.4966   SiO 2     81.995           −146.76339   .7553       87.352       L312   −2729.19964   45.3237   SiO 2     104.995           −158.37001   .7762       107.211       L313   356.37642   52.1448   SiO 2     118.570           −341.95165   1.1921       118.519       L314   159.83842   44.6278   SiO 2     105.627           234.73586   .7698       102.722       L315   172.14697   16.8960   SiO 2     88.037           119.53455   36.6804       75.665       L316   −392.62196   7.0000   SiO 2     74.246           171.18767   29.4986       67.272       L317   −176.75022   7.0000   SiO 2     66.843           186.50720   38.4360       67.938       L318   −113.94008   7.0213   SiO 2     68.650           893.30270   17.7406       82.870       L319   −327.77804   18.9809   SiO 2     85.090           −192.72640   .7513       89.918       L320   −3571.89972   34.3608   SiO 2     103.882           −209.35555   .7500       106.573       L321   676.38083   62.6220   SiO 2     119.191           −449.16650   .0000       119.960           Infinity   2.8420       120.991           Diaphragm   .0000       120.991       L322   771.53843   30.6490   SiO 2     123.568           −525.59771   13.4504       124.005       L323   330.53202   40.0766   SiO 2     123.477           −712.47666   23.6787       122.707       L324   −250.00950   10.0000   SiO 2     121.877           −513.10270   14.8392       121.995       L325   −344.63359   20.3738   SiO 2     121.081           −239.53067   .7500       121.530       L326   146.13385   34.7977   SiO 2     102.544           399.32557   .7510       99.992       L327   132.97289   29.7786   SiO 2     87.699           294.53397   18.8859       82.024       L328   −3521.27938   A 11.4951   SiO 2     75.848           287.11066   .7814       65.798       L329   103.24804   27.8602   SiO 2     58.287           41.64286   1.9089       36.734       L330   41.28081   31.0202   SiO 2     36.281           279.03201   1.9528       28.934           infinity   12.0000       28.382           infinity           13.603                                                                                                                                                                                                            
         [0071]    [0071]                                                         TABLE 4                                   No.   r (mm)   d (mm)   Glass                                        0b       36.005               601   −1823.618   15.518   Quartz Glass               −214.169   10.000           602   −134.291   7.959   Quartz Glass               328.009   6.376           603   783.388   26.523   Quartz Glass               −163.805   .600           604   325.109   20.797   Quartz Glass               −499.168   1.554           605   224.560   24.840   Quartz Glass               −403.777   .600           606   142.336   9.000   Quartz Glass               86.765   23.991           607   6387.721   7.700   Quartz Glass               148.713   21.860           608   −185.678   8.702   Quartz Glass               237.204   30.008           609   −104.297   9.327   Quartz Glass               −1975.424   12.221           610   −247.819   17.715   Quartz Glass               −152.409   .605           611   1278.476   40.457   Quartz Glass               −163.350   .778           612   697.475   28.012   Quartz Glass               −346.153   2.152           613   232.015   28.068   Quartz Glass               −3080.194   2.606           614   219.153   21.134   Quartz Glass               434.184   9.007           615   155.091   13.742   Quartz Glass               103.553   34.406           616   −207.801   8.900   Quartz Glass               131.833   35.789           617   −118.245   9.299   Quartz Glass               1262.191   27.280           618   −121.674   42.860   Quartz Glass               −151.749   .825           619   −366.282   20.128   Quartz Glass               −236.249   .838           620   2355.228   31.331   Quartz Glass               −296.219   2.500           P61   ∞   6.000   Quartz Glass               ∞   12.554           AS           621   774.283   29.041   Quartz Glass               −782.899   .671           622   456.969   28.257   Quartz Glass               −1483.609   .603           623   227.145   30.951   Quartz Glass               658.547   36.122           624   −271.535   15.659   Quartz Glass               −997.381   4.388           625   −1479.857   27.590   Quartz Glass               −288.684   .604           626   259.988   22.958   Quartz Glass               1614.379   .600           627   105.026   29.360   Quartz Glass               205.658   .600           628   110.916   16.573   Quartz Glass               139.712   13.012           629   499.538   8.300   Quartz Glass               56.675   9.260           630   75.908   17.815   Quartz Glass               51.831   .995           631   43.727   19.096   Quartz Glass               499.293   2.954           P62   ∞   2.000   Quartz Glass               ∞   12.000           Im