Abstract:
The invention concerns a microlithographic reduction projection catadioptric objective having an even number greater than two of curved mirrors, being devoid of planar folding mirrors and featuring an unobscured aperture. The objective has a plurality of optical elements, and no more than two optical elements deviate substantially from disk form. The objective has an object side and an image side, and has in sequence from the object side to the image side a catadioptric group providing a real intermediate image, a catoptric or catadioptric group providing a virtual image, and a dioptric group providing a real image.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   The present application claims the benefit of U.S. patent application Ser. No. 60/176,190, filed Jan. 14, 2000. 

   REFERENCE TO A MICROFICHE APPENDIX 
   Not applicable. 
   BACKGROUND OF THE INVENTION 
   1. Technical Field 
   The invention concerns a microlithographic reduction projection catadioptric objective comprising an even number greater than two of curved mirrors, being devoid of planar folding mirrors and featuring an unobscured aperture. 
   2. Background Art 
   Such objectives are known from European Patent document EP 0 779 528 A (FIG. 3) as variants of pure catoptric objectives, with six mirrors and three lenses. All optical surfaces are symmetric to a common axis and an object plane and an image plane are situated on this axis upstream and downstream of the objective. However, all but one of the mirrors need to be cut off sections of bodies of revolution, so that mounting and adjustment face difficulties. The lenses serve only as correcting elements of minor effect. The most image ward mirror is concave. 
   U.S. Pat. No. 4,701,035 (FIG. 12) shows a similar objective. This one, however, has nine mirrors, two lenses and two intermediate images. The object plane and image plane are situated within the envelope of the objective. 
   In both cases the image field is an off-axis ring sector. 
   A fully axially symmetric catadioptric objective is known from German Patent document DE 196 39 586 A (corresponding to U.S. patent application Ser. No. 09/263,788), e.g., with two opposing concave mirrors, an image field centered at the axis, and a central obscuration of the aperture. 
   Another type of catadioptric objective suitable for microlithographic reduction projection has only one concave mirror, but at least one folding mirror, and is known from U.S. Pat. No. 5,052,763 and European Patent document EP 0 869 383A inter alia and is referenced here as “h-design”. 
   U.S. Pat. No. 5,323,263 discloses a microlithographic reduction projection catadioptric objective with multiple folding mirrors, where an intermediate image is arranged subsequent to a first concave mirror and a singly passed lens group. 
   U.S. Pat. Nos. 5,575,207 and 4,685,777 show very similar multiply folded catadioptric objectives. 
   SUMMARY OF THE INVENTION 
   It is an object of the invention to provide a generic objective of good capabilities of chromatic correction for typical bandwidths of excimer laser light sources, which allows for a high imageside numerical aperture, and which reduces complexity of mounting and adjusting. 
   The solution to this problem is found in the present invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is described in detail with respect to the drawings, wherein: 
       FIG. 1  shows a front end of an objective; 
       FIG. 2  shows the lens plan of a version of the objective; and 
       FIG. 3  shows the lens plan of another version of the objective. 
   

   DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
   An important concept of the present invention is to replace the front end of an “h-design” objective with a different front end that provides a single axis system. 
   In the simplest version of this new front end, set up to be part of a −0.25 reduction, 0.75 image side NA system with a 7 mm ×26 mm rectangular image field size, the optical elements are shown in the lens section of FIG.  1 . This catadioptric partial system provides a virtual image on the right hand side, which has enough a axial chromatic aberration to compensate for a conventional focusing lens group that forms a 0.75 NA image. A real pupil or aperture plane is formed on the right hand end of the system. The system shown has enough Petzval sum so that the focusing lens group can be made up mostly of positive power lenses. 
   There is only one field lens L 1  in this system, which is close to the object plane (Ob) end of the system. That location is an advantage with respect to lens heating. There are no aspherics in this front end, and none are needed. The mirrors M 1  to M 4  are all spherical and coaxial to the common optical axis. It is possible to correct this front end system for spherical aberration of the pupil, but that requires a somewhat larger concave mirror than shown here. Spherical aberration can as well be corrected in the focusing lens group and therefore the size of the concave mirror M 3  is minimized. Decreased size of mirror M 3  simplifies the mechanical construction of the system. In the example of  FIG. 1 , the concave mirror M 3  has an illuminated area that is about 165 mm wide in the plane of the drawing and about 500 mm in the orthogonal direction, for a 7 mm×26 mm image field size. 
   The greatest distance of any ray from the common optical axis is 370 mm in this example. This is substantially less than for many designs of the “h-design” type, where the concave mirror thickness and mount thickness must be added in to the sideways ray path distance after the fold mirror, from the axis to the concave mirror. The package envelope of this new design is more attractive. 
   More axial chromatic aberration and Petzval curvature can be introduced by the front end (FE) than in the example of  FIG. 1 , by increasing the power of the negative lens L 2  near the concave mirror M 1 . A strong lens L 2  however, tends to introduce too much overcorrected spherical aberration and makes the intermediate image aberrations too large. Thus, a better version of the design has two concave lenses near the concave mirror. 
   The field lens L 1  near the object plane Ob can also be split into two weaker lenses, to help control pupil aberration. Finally, the convex mirror M 2  that is near the reticle (Ob) can be split off from the field lens L 1  surface and made to be a separate optical element. This more complicated design is capable of better performance. 
   It is possible to make this system meet all of the first-order specifications of a typical microlithographic objective as well as correct for Petzval curvature, and axial and lateral color correction, with only positive lenses in the telecentric focusing group (TFG). An example is shown in  FIG. 2 , without any other kind of aberration correction. The lens heating is substantially uniform, as the beam diameter is large on all the lenses L 21  to L 29 . 
     FIG. 3  shows a further embodiment example. The front end FE′ features a field lens group split into 3 lenses L 31  to L 33 , which helps achieve a good quality telecentricity. Also, the focussing lens group (FLG′) now has more lenses L 36  to L 44 . This focussing lens group FLG′ has a few aspherics. There are also some aspherics in the catadioptric front end FE′ of the design that simplify correction, though they are not compulsory. The large mirror M 33  is still a sphere, as this simplifies production. 
   Preferred locations of the aspheric surface are near an aperture or pupil plane, namely on mirror M 31  or on lenses L 34 , L 35 , where the marginal ray height exceeds 80% of the height of the neighboring aperture, and on the other hand on some distant locations with marginal ray height less than 80% of the height of the next aperture. Examples of the latter are surfaces of the field lens group or of the last two lenses next to the image plane Im. 
   The polychromatic r.m.s. wavefront error value in this design now varies from 0.05 to 0.13 waves over a 26×7 mm field at 0.75 NA in a 4× design. 
   The catadioptric front end FE′ is now somewhat more complicated than in  FIGS. 1 and 2 . The design is both side telecentric and corrected for pupil aberration and distortion. The working distance is 34 mm on the reticle end (Ob) and 12 mm on the wafer end (Im). The system length is about 1200 mm. 
   The focusing lens group FLG′ is almost all positive lenses (except L 41 ), with no strong curves. The very large amount of aberration at the intermediate image is because the two concave lenses L 31 , L 35  next to the concave mirror M 31  do not have the optimum bending under this aspect. 
   Table I provides lens data for this embodiment. 
   Mechanical construction of the lens barrel for this type of objective is very advantageous when compared with catadioptric systems with folding of the optical axis (as “h-design” etc.). Here, only the mirrors M 32  and M 33  cannot be full disks. Mirror M 33 , however, can be extended to a full annular body that can be mounted in a rotationally symmetric structure. The barrel must be cut between the lenses L 33  and L 36  at a lower side of the drawing of  FIG. 3  to provide passage to the light beam, but generally can be cylindrical. Only mirror M 33  must be positioned outside this cylindrical barrel, but at a very moderate distance. 
   With “h-designs”, a similar effect needs additional folding. Folding mirrors are generally not desirable, as they cause intensity losses and quality degradation of the light beam, and production costs and adjustment work without benefit to image quality. 
   It is possible to produce mirror M 33  as an annular blank, and it can be mounted as this annular part in a cylindrical barrel that is extended in diameter in this area. 
   It can be seen that concave spherical mirror M 33  is the only mirror extending outside of a cylindrical envelope scribed around all the lenses that has the radius of the lens of greatest radius. This shows again that this type of objective is suitable for mounting in a compact cylindrical barrel of high intrinsic rigidity. 
   The lens material in the given examples is calcium fluoride, fluorspar. Other materials standing alone or in combinations, may be used, namely at other wavelengths of excimer lasers. Quartz glass, eventually suitably doped, and fluoride crystals are such suitable materials. 
   Four, six and eight or more mirror objective designs known in the field of EUV lithography are generally suitable as starting designs for the front end group of the invention, with the eventual deviation that a virtual image instead of a real image is provided. 
   These embodiments are not intended to limit the scope of the invention. For example, in addition to curved mirrors, planar folding mirrors may occasionally be introduced into the system according to the invention. 
   All the features of the different claims can be combined in various combinations according to the invention. 
   
     
       
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
             
             
             
             
             
             
           
             
             
             
             
             
             
             
           
             
           
             
             
             
             
             
           
             
             
             
             
             
             
           
             
           
             
             
           
             
             
           
             
           
             
             
             
             
             
             
           
             
           
             
             
             
             
             
             
           
             
           
             
             
           
             
             
             
             
           
             
             
           
             
             
             
             
           
             
             
           
             
             
             
             
           
             
             
           
             
             
             
             
           
             
             
           
             
             
             
             
           
             
             
           
         
             
               TABLE 1 
             
           
           
             
                 
             
             
               CODE V&gt;  lis 
             
             
               Shafer - design .75NA, 4x, 75 mm Obj. - hight 
             
           
        
         
             
                 
               RDY 
               THI 
               RMD 
               GLA 
               CCY 
               THC 
               GLC 
             
             
                 
                 
             
           
        
         
             
               &gt; OBJ: 
               INFINITY 
               34.000000 
                 
                 
               100 
               100 
                 
             
             
               1: 
               147.23281 
               21.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               2: 
               236.79522 
               1.000000 
                 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.273300E−07 
               B 
               : 
               0.201130E−11 
               C 
               : 
               −.871260E−16 
               D 
               : 
               0.118100E−19 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               3: 
               145.44401 
               27.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
                 
             
             
               4: 
               224.64885 
               51.185724 
                 
                 
               100 
               100 
             
             
               5: 
               −223.00016 
               25.004072 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               6: 
               −184.59445 
               162.666291 
                 
                 
               100 
               100 
             
             
               7: 
               −97.23630 
               12.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               8: 
               −928.69926 
               24.980383 
                 
                 
               100 
               100 
             
             
               9: 
               −75.28503 
               15.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               10: 
               −116.14787 
               3.000000 
                 
                 
               100 
               100 
             
             
               11: 
               −134.28262 
               −3.000000 
               REFL 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.474810E−08 
               B 
               : 
               0.506570E−12 
               C 
               : 
               −.284590E−17 
               D 
               : 
               0.934830E−21 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               12: 
               −116.14787 
               −15.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
                 
             
             
               13: 
               −75.28503 
               −24.980383 
                 
                 
               100 
               100 
             
             
               14: 
               −928.69926 
               −12.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               15: 
               − 97.23630 
               −162.666291 
                 
                 
               100 
               100 
             
             
               16: 
               −184.59445 
               −25.004072 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               17: 
               −223.00016 
               −11.195502 
                 
                 
               100 
               100 
             
             
               18: 
               −363.91714 
               11.195502 
               REFL 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               −.107960E−07 
               B 
               : 
               0.170830E−13 
               C 
               : 
               −.328180E−16 
               D 
               : 
               0.143630E−20 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               19: 
               −223.00016 
               25.004072 
                 
               ‘CAF-UV’ 
               100 
               100 
                 
             
             
               20: 
               −184.59445 
               162.666291 
                 
                 
               100 
               100 
             
             
               21: 
               −96.00000 
               15.000000 
                 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               -1.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.000000E+00 
               B 
               : 
               0.000000E+00 
               C 
               : 
               0.000000E+00 
               D 
               : 
               0.000000E+00 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               22: 
               INFINITY 
               24.980383 
                 
               100 
               100 
                 
             
             
               23: 
               −247.00000 
               67.808099 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               -1.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.000000E+00 
               B 
               : 
               0.000000E+00 
               C 
               : 
               0.000000E+00 
               D 
               : 
               0.000000E+00 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               24: 
               −237.00000 
               266.861281 
                 
               100 
               100 
                 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               −1.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.000000E+00 
               B 
               : 
               0.000000E+00 
               C 
               : 
               0.000000E+00 
               D 
               : 
               0.000000E+00 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               25: 
               −470.62323 
               −266.861281 
               REFL 
                 
               100 
               100 
                 
             
             
               26: 
               −210.84570 
               266.861281 
               REFL 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               −.419940E−08 
               B 
               : 
               −.904030E−13 
               C 
               : 
               −.297400E−17 
               D 
               : 
               −.10634.0E−21 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               27: 
               INFINITY 
               35.031723 
                 
                 
               100 
               100 
                 
             
             
               28: 
               1621.80000 
               33.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.155580E−07 
               B 
               : 
               −.854090E−12 
               C 
               : 
               0.123240E−16 
               D 
               : 
               −.559700E−21 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               29: 
               −747.60113 
               67.859320 
                 
                 
               100 
               100 
                 
             
             
               30: 
               827.21786 
               27.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               31: 
               −1939.50000 
               20.227637 
                 
                 
               100 
               100 
             
             
               32: 
               197.25357 
               14.999969 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               33: 
               128.31113 
               39.542169 
                 
                 
               100 
               100 
             
             
               34: 
               −1370.10000 
               24.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               −.164770E−07 
               B 
               : 
               0.155510E−11 
               C 
               : 
               −.542070E−16 
               D 
               : 
               0.556740E−20 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               35: 
               −253.41246 
               18.476467 
                 
                 
               100 
               100 
                 
             
             
               36: 
               109.90063 
               30.001392 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               ST0: 
               242.23740 
               22.529315 
                 
                 
               100 
               100 
             
             
               38: 
               −264.99438 
               46.219742 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               39: 
               −372.29467 
               0.998929 
                 
                 
               100 
               100 
             
             
               40: 
               173.30822 
               24.000000 
                 
               ‘CAF-UV’ 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               0.628520E−07 
               B 
               : 
               −.915530E−11 
               C 
               : 
               −.628040E−15 
               D 
               : 
               −.946620E−19 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               41: 
               1411.60000 
               4.845900 
                 
                 
               100 
               100 
                 
             
             
               42: 
               110.28842 
               22.740804 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               43: 
               160.79657 
               13.371732 
                 
                 
               100 
               100 
             
             
               44: 
               69.10873 
               45.185600 
                 
               ‘CAF-UV’ 
               100 
               100 
             
             
               45: 
               −895.78799 
               11.999039 
                 
                 
               100 
               100 
             
           
        
         
             
                 
                ASP 
               : 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
             
             
                 
                K 
               : 
               0.000000 
               KC 
               : 
               100 
             
             
                 
                IC 
               : 
               YES 
               CUF 
               : 
               0.000000 
               CCF 
               : 
               100 
             
             
                 
                A 
               : 
               −.113590E−06 
               B 
               : 
               0.281520E−09 
               C 
               : 
               −.171880E−12 
               D 
               : 
               0.507740E−16 
             
             
                 
                AC 
               : 
               100 
               BC 
               : 
               100 
               CC 
               : 
               100 
               DC 
               : 
               100 
             
           
        
         
             
               IMG: 
               INFINITY 
               0.000000 
                 
               100 
               100 
                 
             
           
        
         
             
               SPECIFICATION DATA 
             
           
        
         
             
               NAO 
               −0.18750 
                 
                 
                 
             
             
               TEL 
             
             
               DIM 
               MM 
             
             
               WL 
               157.63 
               157.63 
               157.63 
             
             
               REF 
               2 
             
             
               WTW 
               1 
               1 
               1 
             
           
        
         
             
               XOB 
               0.00000 
               0.00000 
               0.00000 
               0.00000 
               0.00000 
             
             
                 
               0.00000 
               0.00000 
             
             
               YOB 
               0.00000 
               26.51700 
               40.00000 
               53.03300 
               64.95100 
             
             
                 
               70.15600 
               75.00000 
             
             
               WTF 
               0.00000 
               0.00000 
               1.00000 
               1.00000 
               1.00000 
             
             
                 
               1.00000 
               1.00000 
             
             
               VUX 
               0.00000 
               −0.00138 
               −0.00308 
               −0.00534 
               −0.00803 
             
             
                 
               −0.00941 
               −0.01082 
             
             
               VLX 
               0.00000 
               −0.00138 
               −0.00308 
               −0.00534 
               −0.00803 
             
             
                 
               −0.00941 
               −0.01082 
             
             
               VUY 
               0.00000 
               −0.00065 
               −0.00224 
               −0.00398 
               −0.00520 
             
             
                 
               −0.00531 
               −0.00535 
             
             
               VLY 
               0.00000 
               −0.00370 
               −0.00706 
               −0.01156 
               −0.01709 
             
             
                 
               −0.01985 
               −0.02220 
             
           
        
         
             
               APERTURE DATA/EDGE DEFINITIONS 
             
           
        
         
             
                 
               CA 
             
           
        
         
             
                 
               APERTURE data not specified for surface Obj thru 46 
             
           
        
         
             
               PRIVATE CATALOG 
             
           
        
         
             
                 
               PWL 
               157.63 
               157.63 
               157.63 
                 
             
             
                 
               ‘CAF-UV’ 
               1.558411 
               1.558410 
               1.558409 
             
           
        
         
             
               REFRACTIVE INDICES 
             
           
        
         
             
                 
               GLASS CODE 
                 
               157.63 
               157.63 
               157.63 
             
             
                 
               ‘CAF-UV’ 
                 
               1.558409 
               1.558410 
               1.558411 
             
           
        
         
             
               No solves defined in system 
             
             
               No pickups defined in system 
             
           
        
         
             
                 
               INFINITE CONJUGATES 
             
           
        
         
             
                 
               EFL 
               −66053.1391 
                 
             
             
                 
               BFL 
               −16500.9052 
             
             
                 
               FFL 
               0.2642E+06 
             
             
                 
               FNO 
               −0.0000 
             
           
        
         
             
                 
               AT USED CONJUGATES 
             
           
        
         
             
                 
               RED 
               −0.2500 
                 
             
             
                 
               FNO 
               0.6667 
             
             
                 
               OBJ DIS 
               34.0000 
             
             
                 
               TT 
               1198.5356 
             
             
                 
               IMG DIS 
               11.9990 
             
             
                 
               OAL 
               1152.5365 
             
           
        
         
             
                 
               PARAXIAL IMAGE 
             
           
        
         
             
                 
               HT 
               18.7496 
                 
             
             
                 
               THI 
               12.0008 
             
             
                 
               ANG 
               0.0000 
             
           
        
         
             
                 
               ENTRANCE PUPIL 
             
           
        
         
             
                 
               DIA 
               0.3818E+10 
                 
             
             
                 
               THI 
               0.1000E+11 
             
           
        
         
             
                 
               EXIT PUPIL 
             
           
        
         
             
                 
               DIA 
               25217.8299 
                 
             
             
                 
               THI 
               −16501.3415 
             
           
        
         
             
                 
               CODE V&gt;  out t 
             
             
                 
                 
             
             
                 
               Key for Table 1:  
             
             
                 
               (1) OBJ stands for object plane;  
             
             
                 
               (2) IMG stands for image plane;  
             
             
                 
               (3) RDY stands for radius;  
             
             
                 
               (4) THI stand for thickness;  
             
             
                 
               (5) RMD stands for reflective;  
             
             
                 
               (6) GLA stands for glass sort;  
             
             
                 
               (7) CAF-UV stands for Ca 2 F, ultraviolet grade;  
             
             
                 
               (8) NAO stands for numerical aperture at object side;  
             
             
                 
               (9) DIM stands for dimensions in millimeters;  
             
             
                 
               (10) WL stands for wavelength; and  
             
             
                 
               (11) REFRACTIVE INDICES gives the refractive index of CaF 2  taken as given quantity for the calculation.  
             
           
        
       
     
   
   Key for Table 1: (1) OBJ stands for object plane; (2) IMG stands for image plane; (3) RDY stands for radius; (4) THI stand for thickness; (5) RMD stands for reflective; (6) GLA stands for glass sort; (7) CAF-UV stands for Ca 2 F, ultraviolet grade; (8) NAO stands for numerical aperture at object side; (9) DIM stands for dimensions in millimeters; (10) WL stands for wavelength; and (11) REFRACTIVE INDICES gives the refractive index of CaF 2  taken as given quantity for the calculation.