Open Access
Table 3
Configurations of the five best achromatic cemented doublets and their spot sizes in mm. R1, R2 and R3 are the radius of curvature of sequential surfaces in millimetres. tj are the center thickness of the two lenses in mm and s’ the back focal length of the achromatic cemented doublets in mm.
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| Glass 1 | N-FK58 | N-PK51 | N-PK51 | N-FK51A | N-PK52A |
| Glass 2 | N-LASF31A | N-BASF64 | N-LASF41 | N-LASF47 | N-LASF41 |
| R1 (mm) | 52.256 | 69.622 | 40 | 41.431 | 40 |
| R2 (mm) | −50.005 | −43.523 | −61.472 | −55.552 | −59.612 |
| R3 (mm) | −89.575 | −106.966 | −492.996 | −150.846 | −258.397 |
| t1 (mm) | 4.087 | 4.541 | 4.264 | 4.326 | 4.306 |
| t2 (mm) | 6 | 6 | 6 | 6 | 6 |
| s′ | 97.383 | 96.421 | 93.513 | 94.081 | 94.100 |
| 100% Spot diameter (mm) | 0.009 | 0.001 | 0.011 | 0.012 | 0.012 |
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