Wenxiong LI, Junli SHEN, Xingxiang ZHANG, Zhenyu LU, Zhisheng LI, Hasiaoqier HAN, Qingwen WU. Design of low temperature infrared off-axis three-mirror collimation system[J]. Optics and Precision Engineering, 2023, 31(9): 1285
- Optics and Precision Engineering
- Vol. 31, Issue 9, 1285 (2023)
Fig. 1. Light path of off-axis three-mirror collimation system
Fig. 2. Schematic diagram of off-axis three-mirror structure
Fig. 3. Structure of collimation system
Fig. 4. Low thermal conductivity insulation support structure
Fig. 5. Simulation results of secondary mirror with low thermal conductivity insulation support structure
Fig. 6. Simulation results of secondary mirror with common support structure
Fig. 7. Simulation results of primary mirror
Fig. 8. Simulation results of secondary mirror
Fig. 9. Simulation results of tertiary mirror
Fig. 10. Simulation results of collimation system
Fig. 11. Wavefront error at room temperature and low temperature in each field of view
Fig. 12. MTF of collimation system （@50 lp/mm）
Fig. 13. Liquid nitrogen rapid cooling test of 280 mm SiC mirror blank
Fig. 14. Radiative cooling curves
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Table 1. Simulation and analysis results of primary， secondary and tertiary mirrors （λ =632.8 nm）
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Table 2. Simulation and analysis results of collimation System （λ =632.8 nm）
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Table 3. Wavefront error variation of optical system at room and 100 K （λ =632.8 nm）
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