Infrared and Laser Engineering, Volume. 52, Issue 7, 20230338(2023)
Freeform off-axis four-mirror all-aluminum infrared detection system (invited)
Figures & Tables(22)
Fig. 4. Residual sag distribution 3D diagram of each mirror after removing the best-fit sphere
Fig. 15. The deformation datas of the mirrors and focal plane are imported into the optical software
Fig. 17. Wavefront testing optical path (a) and test photographic (b) of the system
Table 1. Specification of the optical system
View tableView in ArticleTable 1. Specification of the optical system
Parameter Specifications Resolution/pixel 640×512 Pixel size/μm2 25×25 Spectral band/μm 7.7-10.0 Entrance pupil diameter/mm 73 F-number 2 Field of view/(°) 6.25×5.0 Distortion ＜5% RMS spot size/μm ＜50×50 RMS wavefront error ＜1λ@632.8 nm Package size/mm3 ＜150×250×300 Working temperature/℃ 10-30
Table 2.
XY polynomial coefficients of M1-M4View tableView in ArticleTable 2.
XY polynomial coefficients of M1-M4Term XY polynomial Coefficient of M1 Coefficient of M2 Coefficient of M3 Coefficient of M4 1 X0Y1 −1.91590e-02 −4.85671e-02 1.04008e-01 −9.21760e-02 2 X2Y0 −6.09199e-04 1.48764e-03 3.00154e-02 1.86876e-04 3 X0Y2 −7.87246e-04 6.40174e-04 2.82810e-02 −2.30088e-04 4 X2Y1 −8.05246e-06 −8.45861e-06 3.34959e-05 −3.48285e-06 5 X0Y3 −6.55433e-06 −1.09920e-05 2.33983e-06 −3.22347e-06 6 X4Y0 2.31375e-08 −8.36654e-09 9.54513e-06 7.97118e-09 7 X2Y2 2.95744e-08 −1.37912e-07 2.41580e-05 −1.39353e-08 8 X0Y4 1.02931e-08 −1.43957e-07 1.29804e-05 −1.63718e-08 9 X4Y1 −2.87921e-10 −8.54897e-10 −3.81025e-07 −2.18160e-10 10 X2Y3 −4.62580e-10 −3.00746e-09 3.11828e-09 −5.13363e-10 11 X0Y5 −1.89183e-10 −2.32407e-09 −3.87337e-08 −2.60893e-10 12 X6Y0 1.08579e-12 3.93228e-13 4.29815e-09 6.11019e-13 13 X4Y2 5.39421e-12 −7.60172e-12 6.35325e-08 −2.01506e-12 14 X2Y4 5.93096e-12 −3.12901e-11 3.73110e-08 −5.25985e-12 15 X0Y6 1.89380e-12 −2.73598e-11 1.60445e-08 −2.60015e-12 16 X6Y1 −3.74645e-14 −1.50798e-13 3.80074e-09 −5.13163e-14 17 X4Y3 −7.57945e-14 −2.30257e-13 2.12275e-10 −1.60806e-13 18 X2Y5 −6.16321e-14 −3.77989e-13 1.84473e-10 −1.35982e-13 19 X0Y7 −1.68419e-14 −2.20673e-13 3.74348e-10 −4.21283e-14
Table 3. Allocation table for positioning and attitude tolerance of M1-M4
View tableView in ArticleTable 3. Allocation table for positioning and attitude tolerance of M1-M4
No. Term Value No. Term Value 1 Detector position compensation ±2.00 mm 4 Distance between M3 and M4 ±0.05 mm 2 Distance between M1 and M2 ±0.05 mm 5 X-decenter of M1 ±0.02 mm 3 Distance between M2 and M3 ±0.05 mm 6 Y-decenter of M1 ±0.02 mm 7 X-tilt of M1 ±0.017° 16 Y-decenter of M3 ±0.02 mm 8 Y-tilt of M1 ±0.017° 17 X-tilt of M3 ±0.017° 9 Z-tilt of M1 ±0.017° 18 Y-tilt of M3 ±0.017° 10 X-decenter of M2 ±0.02 mm 19 Z-tilt of M3 ±0.017° 11 Y-decenter of M2 ±0.02 mm 20 X-decenter of M4 ±0.02 mm 12 X-tilt of M2 ±0.017° 21 Y-decenter of M4 ±0.02 mm 13 Y-tilt of M2 ±0.017° 22 X-tilt of M4 ±0.017° 14 Z-tilt of M2 ±0.017° 23 Y-tilt of M4 ±0.017° 15 X-decenter of M3 ±0.02 mm 24 Z-tilt of M4 ±0.017°
Table 4. 6061-T6 material properties
View tableView in ArticleTable 4. 6061-T6 material properties
Density/ kg·m3 Thermal expansion coefficient /K Elastic modulus/ N·m−2 Poisson's ratio Thermal conductivity /W·(m·K)−1 2710 2.4E-5 6.9E10 0.33 154
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Rong Gao, Xianglong Mao, Jinpeng Li, Zhichen Xu, Yongjun Xie. Freeform off-axis four-mirror all-aluminum infrared detection system (invited)[J]. Infrared and Laser Engineering, 2023, 52(7): 20230338
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Received: Jun. 6, 2023
Accepted: --
Published Online: Aug. 16, 2023
The Author Email: Mao Xianglong (maoxianglong@opt.ac.cn)
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