Infrared and Laser Engineering, Volume. 52, Issue 6, 20230175(2023)
Interferometric test of coaxial folded mirrors for visible/near-infrared imaging systems (invited)
Figures & Tables(18)
Fig. 5. Calculation of normal rays reflected off the test surface to determine the CGH position
Fig. 7. Annular ghost fringes generated by (+3, 0) orders when the distances of CGH to the point source and the tertiary mirror are 43 mm and 20 mm, respectively
Fig. 8. Ghost fringes are eliminated when the distances of CGH to the point source and the tertiary mirror are 45 mm and 18 mm, respectively
Fig. 9. CGH design for the secondary mirror and the fourth mirror with a 4-inch
Fig. 10. Ghost reflection of the fourth mirror CGH (−1 order) with a 4-inch
Fig. 11. CGH design for the secondary mirror and the fourth mirror with a 6-inch
Fig. 12. Diamond turning of the monolithic primary mirror and tertiary mirror
Fig. 13. CGH null test of the monolithic primary mirror and tertiary mirror
Fig. 14. Surface error and null fringe interferogram of the primary mirror and tertiary mirror
Table 1. Initial structure parameters
View tableView in ArticleTable 1. Initial structure parameters
Surface Radius/mm Distance/mm Conic ${{M} }_{\text{1} }$ −43.576 −4.850 −3.272 ${{M} }_{\text{2} }$ 229.697 4.700 91.869 ${{M} }_{\text{3} }$ 107.812 −4.895 −336.062 ${{M} }_{\text{4} }$ −27.388 − −18.507
Table 2. Basic surface parameters
View tableView in ArticleTable 2. Basic surface parameters
Surface $ {{M}}_{\text{1}} $ $ {{M}}_{\text{2}} $ $ {{M}}_{\text{3}} $ $ {{M}}_{\text{4}} $ Radius/mm −67.998 −239.1149 −132.9414 −64.7218 Distance/mm −15.485 18.15515 −12.74705 24.65042 Diameter/mm 66.2129 52.86353 52.75673 32.0385 Conic coefficient 0.29199 67.76022 2.859459 −25.448
Table 3. High order aspheric coefficients
View tableView in ArticleTable 3. High order aspheric coefficients
Surface $ {{M}}_{\text{1}} $ $ {{M}}_{\text{2}} $ $ {{M}}_{\text{3}} $ $ {{M}}_{\text{4}} $ A2 0.0015293882 −0.0075416624 0.0056460009 0.0015335974 A4 −1.0962896e-006 4.375154e-006 −2.6497218e-007 −1.296045e-005 A6 1.5847328e-010 3.5537337e-009 −1.6551466e-009 7.4891721e-009 A8 3.3404588e-013 3.7951706e-012 −3.5939478e-013 3.4871654e-011 A10 5.8294423e-016 −5.2626752e-015 1.6072703e-015 −4.9330029e-013 A12 −5.4089482e-019 4.9805961e-018 −3.6151876e-018 2.1115162e-015 A14 2.6248278e-022 −2.5360935e-021 2.9968098e-021 −4.6380052e-018 A16 5.322143e-026 −8.9904043e-025 −1.1493177e-024 4.0505877e-021
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Yupeng Xiong, Wenwen Lu, Cheng Huang, Fulei Chen, Shanyong Chen. Interferometric test of coaxial folded mirrors for visible/near-infrared imaging systems (invited)[J]. Infrared and Laser Engineering, 2023, 52(6): 20230175
Paper Information
Category: Invited paper
Received: Mar. 30, 2023
Accepted: --
Published Online: Jul. 26, 2023
The Author Email: Chen Shanyong (.mesychen@163.com)
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