Design of SWIR/MWIR catadioptric common-aperture optical system

Num.	Specification	Short-wave system	Mid-wave system
注：Entrance PD= Entrance Pupil Diameter，入瞳尺寸；Exit PD=Exit Pupil diameter，出瞳距离。
1	Wave band/ μm	1.0-1.7	3.7-4.8
2	Channels	1	3.7-4.0，4.1-4.35，4.35-4.6，4.55-4.8
3	FOV/ω	±0.107°	±0.65°
4	Focus/mm	2500	750
5	Entrance PD/mm	300	300
6	Exit PD/mm	1300	1300
7	Image size	/	The same size/4
8	Distortion	≤0.3%	≤1%

Table 2. Optical design parameters of the main system
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Table 2. Optical design parameters of the main system
Mirror Num. Curve radius/mm Distance/mm Semi-diameter/mm Off-axis/mm
1 −1500 −900 170 300
2 300 40 −58

Table 3. Optical design parameters of the mid-wave main system

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Table 3. Optical design parameters of the mid-wave main system

Mirror Num.	Curve radius/mm	Distance/mm	Semi-diameter/mm	Off-axis/mm
1	−1500.00	−900	170.00	300
2	300.00		40.00	−58
3	207.93	19	33.33	KBR
4	−128.33	0.50	33.10	KBR
5	−754.76	10	32.36	SILICON
6	776.51	0.50	32.13	SILICON
7	234.00	20	32.19	KBR
8	−89.34	0	31.84	KBR
9	−89.34	17.20	31.84	GAAS
10	−148.50	200	35.36	GAAS

Table 4. Optical parameters of the short-wave back-end system
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Table 4. Optical parameters of the short-wave back-end system
Num. Specification Short-wave system
1 Wave band/ μm 1.0-1.7
2 FOV/ω(°) ±0.54
3 Focus/mm 500
4 Entrance PD/mm 60
5 Image size /
6 Distortion ≤0.3%

Table 5. Design parameters of the short-wave back-end optical system

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Table 5. Design parameters of the short-wave back-end optical system

Mirror Num.	Curve radius/mm	Distance/mm	Semi-diameter/mm	Materials
1	229.09	20	50.61	H-LAF55
2	−192.78	4.31	49.90	H-LAF55
3	−177.10	12	48.22	H-LAF50B
4	−1950.66	6.70	46.73	H-LAF50B
5	−533.78	11	45.87	H-ZF88GT
6	476.42	35.99	45.19	H-ZF88GT
7	−4768.94	10	45.16	H-LAF55
8	−329.67	436.70	45.19	H-LAF55

Table 6. Design parameters of the mid-wave back-end optical system
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Table 6. Design parameters of the mid-wave back-end optical system
Num. Specification Mid-wave system
1 Wave band/ μm 3.7-4.8
2 FOV/ω ±3.23°
3 Focus/mm 150
4 Entrance PD 60
5 Image size The same size/4
6 Distortion ≤1%

Table 7. Design parameters of the mid-wave back-end optical system

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Table 7. Design parameters of the mid-wave back-end optical system

Mirror Num.	Curve radius/mm	Distance/mm	Semi-diameter/mm	Materials
1	168.31	29.02	47.50	SILICON
2	229.17	9.64	42.54	SILICON
3	6736.72	15.00	41.43	GERMANIUM
4	773.91	102.20	40.61	GERMANIUM
5	820.84	26.25	35.63	SILICON
6	−330.43	7.58	34.56	SILICON
7	−214.63	18.00	31.30	GERMANIUM
8	−446.58	0.10	31.49	GERMANIUM
9	79.49	22.50	30.22	SILICON
10	69.43	230.28	23.24	SILICON

Table 8. Machining and fitting tolerances
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Table 8. Machining and fitting tolerances
Num. Tolerance classification Tolerance value
1 Aperture 2
2 Thickness (spacing)/mm 0.02
3 Refractive index 0.0003
4 Dispersion coefficient 0.005
5 Local aperture 0.2
6 Single-mirror tilt/(′) 1

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Hong-tao MA, Bing HAN, Hong-gang XU, Xu LI, Ming-liang ZHANG. Design of SWIR/MWIR catadioptric common-aperture optical system[J]. Chinese Optics, 2025, 18(2): 359

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Paper Information

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Received: Aug. 29, 2024

Accepted: --

Published Online: May. 19, 2025

The Author Email:

DOI:10.37188/CO.2024-0154

Topics

Table 1. Main parameters of the catadioptric common-aperture optical system

Table 1. Main parameters of the catadioptric common-aperture optical system

Table 2. Optical design parameters of the main system

Table 2. Optical design parameters of the main system

Table 3. Optical design parameters of the mid-wave main system

Table 3. Optical design parameters of the mid-wave main system

Table 4. Optical parameters of the short-wave back-end system

Table 4. Optical parameters of the short-wave back-end system

Table 5. Design parameters of the short-wave back-end optical system

Table 5. Design parameters of the short-wave back-end optical system

Table 6. Design parameters of the mid-wave back-end optical system

Table 6. Design parameters of the mid-wave back-end optical system

Table 7. Design parameters of the mid-wave back-end optical system

Table 7. Design parameters of the mid-wave back-end optical system

Table 8. Machining and fitting tolerances

Table 8. Machining and fitting tolerances