Design and alignment of large-aperture prime focus optical system

Xiwen JIANG; Jinyu ZHAO; Tianyu LÜ; Liang SHAO; Qichang AN; Peng GUO; Haibo JIANG

doi:10.37188/OPE.20223023.2987

Optics and Precision Engineering, Volume. 30, Issue 23, 2987(2022)

Design and alignment of large-aperture prime focus optical system

Xiwen JIANG*... Jinyu ZHAO, Tianyu LÜ, Liang SHAO, Qichang AN, Peng GUO and Haibo JIANG |Show fewer author(s)

Key Laboratory of Intelligent Wavefront Sensing and Control， Changchun Institude of Optics， Fine Mechanics and Physics， Chinese Academy of Sciences， Changchun130033， China

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Figures & Tables(16)

Fig. 1. Structure diagram of prime-focus optical system

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Fig. 2. MTF curve of optical system at 20 ℃

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Fig. 3. MTF curves of optical system at different temperatures

Fig. 4. Spot diagram

$FFT diffraction encircled energy$

Fig. 5. FFT diffraction encircled energy

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Fig. 6. Grid distortion

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Fig. 7. Support system of primary mirror

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Fig. 8. Schematic diagram of primary mirror surface measurement in different conditions

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Fig. 9. Measurement for RMS of primary mirror

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Fig. 10. Alignment and test of corrective lens assembly

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Fig. 11. Layout of optical system alignment

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Fig. 12. Nine-point star point plot in full field

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Table 1. Design requirement for prime-focus optical system

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Table 1. Design requirement for prime-focus optical system

Parameter	Value
Clear aperture/mm	1 000
Wave range/μm	0.4-0.8
Focal length/mm	1 300
F^#	1.3
2X×2Y/（°）	2.7×2.7
MTF at 50 lp/mm of all fields	MTF>0.4
Environment temperature/℃	-40-+50
Detector image format/pixel	6K×6K
Pixel pitch/µm	10

Table 2. Compensating distance value of optical system
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Table 2. Compensating distance value of optical system
Temperature/℃ Compensation/mm
-40 0.48
-25 0.36
-10 0.24
5 0.12
20 0
35 -0.12
50 -0.24

Table 3. Tolerance demands of optical system

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Table 3. Tolerance demands of optical system

Element	Radius ΔR/mm	Conic ΔK	Eccentric of machining χ/（"）	Eccentric of mounting and adjusting Δy/mm	Tilt of mounting and adjusting θ/（"）	Interval， thickness Δd/mm	N，ΔN
Primary mirror	±1	±0.0001	—	—	—	±0.08	—
Lens 1	±0.5	—	20	±0.02	±15	±0.02	4，0.4
Lens 1	±0.5	—	20	±0.02	±15	±0.03	4，0.4
Lens 2	±0.5	—	20	±0.02	±20	±0.02	4，0.4
Lens 2	±0.5	—	20	±0.02	±20	±0.03	4，0.4
Lens 3	±0.5	—	20	±0.02	±20	±0.02	4，0.4
Lens 3	±0.5	—	20	±0.02	±20	±0.03	4，0.4
Lens 4	±0.5	—	20	±0.02	±20	±0.02	4，0.4
Lens 4	±0.5	—	20	±0.02	±20	±0.02	4，0.4
Lens 5	±0.5	—	20	±0.02	±15	±0.02	4，0.4
Lens 5	±0.5	—	20	±0.02	±15	±0.03	4，0.4
Lens 6	±0.5	—	20	±0.02	±20	±0.02	4，0.4
Lens 6	±0.5	—	20	±0.02	±20	—	4，0.4
Mounting and adjusting tolerance of the corrective lens respect to the primary mirror	—	—	—	±0.03	±15	±0.08	—

Table 4. Aligning and testing result of corrective lens

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Table 4. Aligning and testing result of corrective lens

Element	Surface	Inclination relative to the optimum axis/（″）	Deviation of air spacing/mm
Lens 6	Front	1.0	-
Lens 6	Back	9.1	<0.02
Lens 5	Front	11.2	<0.02
Lens 5	Back	7.5	<0.02
Lens 4	Front	12.3	<0.02
Lens 4	Back	10.1	<0.02
Lens 3	Front	6.0	<0.02
Lens 3	Back	10.6	<0.02
Lens 2	Front	14.0	<0.02
Lens 2	Back	11.0	<0.02
Lens 1	Front	2.3	<0.02
Lens 1	Back	16.3	-

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Xiwen JIANG, Jinyu ZHAO, Tianyu LÜ, Liang SHAO, Qichang AN, Peng GUO, Haibo JIANG. Design and alignment of large-aperture prime focus optical system[J]. Optics and Precision Engineering, 2022, 30(23): 2987

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