Infrared and Laser Engineering, Volume. 50, Issue 6, 20200523(2021)
Solving initial structure of bifocal system according to theory of paraxial optics
Figures & Tables(12)
Fig. 6. Light path and aberration diagram. (a) Light path; (b) Spot diagram; (c) MTF; (d) Field curvature and distortion; (e) Lateral color
Table 1. Design index of optical system
View tableView in ArticleTable 1. Design index of optical system
Parameter Value Wavelength 486-656 nm Field of view 8.6°/2.9° Focal length 40 (WFOV) mm 120 (NFOV) mm Spot diagram ＜0.5 pixel@0-0.707 fields ＜0.7 pixel@0.707-1 fields MTF 100 lp/mm＞0.3 Temperature −20-45 ℃ CCD pixel 5 μm
Table 2. Lens parameters after the first step optimization
View tableView in ArticleTable 2. Lens parameters after the first step optimization
Radius/mm Thickness/mm Glass 75.183 4.46 Zk13 −23.174 1.063 −20.456 1.977 Sf6 −43.443 11.686 914.672 2.267 Sk11 −39.321 50.766
Table 3. Lens parameters after the second step optimization
View tableView in ArticleTable 3. Lens parameters after the second step optimization
Radius/mm Thickness/mm Glass −53.012 1.999 P-sf68 −33.681 0.998 −35.382 1.999 N-lak33b 69.948 56.318/1.357 128.881 3.276 Zk13 −34.662 1.524 −26.716 1.999 Sf6 −60.543 0.999 117.307 8.127 Sk11 −44.078 64.357
Table 4. Lens parameters after the third step optimization
View tableView in ArticleTable 4. Lens parameters after the third step optimization
Surface Radius/mm Thickness/mm Glass 1 57.870 10 Zk12 2 −77.106 2 Kzfs8 3 193.419 13.083/59.282 4 −42.419 4.997 P-sf68 5 −28.545 1 6 −27.789 2 N-lak33b 7 77.385 47.197/0.997 8 78.631 6.895 Zk13 9 −26.74 1.612 10 −24.316 2 Sf6 11 −62.578 1 12 60.429 2.496 Sk11 13 −80.595 55.744
Table 5. The size of aberration during optimization
View tableView in ArticleTable 5. The size of aberration during optimization
Field Aberration First step Second step Third step WFOV S1 0.039841 0.028905 0.009558 S2 −0.001334 −0.002104 0.000991 S3 0.003687 0.001254 −0.001397 S4 0.004753 0.000664 0.001780 S5 0.000835 0.006641 0.008469 CL −0.002214 −0.001471 −0.001162 CT −0.001464 −0.001599 −0.000406 Maximum RMS radius/μm 25.203 11.011 5.852 Minimum RMS radius/μm 21.081 10.054 3.684 NFOV S1 0.039844 −0.026449 0.000056 S2 −0.001333 0.001632 −0.000895 S3 0.003687 −0.000991 0.000350 S4 0.004753 0.000664 0.001780 S5 0.000835 0.000643 0.000416 CL −0.002215 0.003065 −0.001473 CT −0.001464 −0.000774 0.000831 Maximum RMS radius/μm 25.368 11.711 8.691 Minimum RMS radius/μm 20.564 8.984 4.626
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Xiao Liang, Huilin Jiang, Hao Sun, Chunyan Wang, Huan Liu. Solving initial structure of bifocal system according to theory of paraxial optics[J]. Infrared and Laser Engineering, 2021, 50(6): 20200523
Paper Information
Category: Optical design
Received: Dec. 21, 2020
Accepted: --
Published Online: Aug. 19, 2021
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