Infrared and Laser Engineering, Volume. 52, Issue 7, 20230339(2023)
Design of cooled freeform off-axis three-mirror system with large rectangular field (invited)
Figures & Tables(13)
Fig. 1. Ray tracing of the chief ray and marginal ray for the coaxial TMA initial structure
Fig. 3. Orientation of the two optical surface aberration contributions for coma, showing the individual aberration field centers and the coma node location[17]
Fig. 4. Coma distribution of all field of view for TMA designed based on NAT
Table 1. Parameters of the optical system and detector
View tableView in ArticleTable 1. Parameters of the optical system and detector
Nature Parameter F-number 5 FOV(2X×2Y) 30×25 Focal length/mm 150 MTF >0.4@ 25 lp/mm Distortion <5% Pixel size/μm 20 Detector format 4000×3400 Detector type Cooled Wavelength/μm 1.5-5 Volume/mm3 <1300×400×400
Table 2. Structure parameters of the optical system and surface parameters of mirrors
View tableView in ArticleTable 2. Structure parameters of the optical system and surface parameters of mirrors
Surface Vertex coordinates/mm Radius/mm Conic A4 A6 A8 A10 X Y Z PM 0.0 0.0 0.0 360.0 6.7 −6.7E-09 −1.0E-013 −4.7E-018 −6.8E-22 SM 0.0 −3.8 −498.9 621.5 - - - - - TM 0.0 −5.2 683.1 −494.2 - - - - - Stop 0.0 −79.2 250.0 - - - - - - Image 0.0 −79.2 150.0 - - - - - -
Table 3. Coefficients of polynomial surface
View tableView in ArticleTable 3. Coefficients of polynomial surface
Surface X2Y0 XY2 X2Y1 X0Y3 X4Y0 X2Y2 X0Y4 X4Y1 X2Y3 SM −3.3E-5 −2.6E-05 −1.1E-07 −5.0E-08 −3.2E-11 4.1E-10 3.3E-10 3.4E-13 −3.2E-12 TM 8.6E-5 9.7E-05 8.7E-08 8.4E-08 2.7E-10 4.9E-10 2.3E-10 1.3E-13 2.6E-13 Surface X0Y5 X6Y0 X4Y2 X2Y4 X0Y6 X6Y1 X4Y3 X2Y5 X0Y7 SM −2.2E-12 −3.4E-16 1.0E-15 9.4E-15 4.9E-15 −2.3E-18 −5.7E-18 −1.1E-17 −4.4E-18 TM 5.0E-14 6.4E-16 1.7E-15 2.1E-15 4.6E-16 6.1E-19 2.1E-18 3.7E-18 1.1E-18
Table 4. Value range of tolerances
View tableView in ArticleTable 4. Value range of tolerances
Surface Surface irregularity (λ=635 nm) Spacing/ mm Decenter/ mm Tilt/ (°) PM RMS λ/20 ±0.03 ±0.03 ±0.02 SM RMS λ/40 ±0.03 ±0.03 ±0.02 TM RMS λ/40 - ±0.03 ±0.02
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Zhuang Qian, Yan Mo, Rundong Fan, Hao Tan, Huiru Ji, Donglin Ma. Design of cooled freeform off-axis three-mirror system with large rectangular field (invited)[J]. Infrared and Laser Engineering, 2023, 52(7): 20230339
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Received: Jun. 7, 2023
Accepted: --
Published Online: Aug. 16, 2023
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