Researching | Design and Alignment of Airborne Compact Long Focal Length Optical System

Acta Photonica Sinica, Volume. 50, Issue 11, 1111002(2021)

Design and Alignment of Airborne Compact Long Focal Length Optical System

Taixi CHEN¹ and Yanxiong WU^2、*

Author Affiliations

¹Ji Hua Laboratory，Foshan，Guangdong 528000，China

²School of Physics and Optoelectronic Engineering，Foshan University，Foshan，Guangdong 528000，China

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Figures&Tables (19)

References (13)

Paper Information

Figures & Tables(19)

Fig. 1. Initial structure of improved R-C system

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Fig. 2. Optical path of catadioptric system

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Fig. 3. MTF design results

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Fig. 4. RMS wavefront error design results

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Fig. 5. Introduce optical system axis

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Fig. 6. Alignment optical path of R-C system

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Fig. 7. Wave aberration of each field after coarse alignment

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Fig. 8. Wave aberration of each field after fine alignment

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Fig. 9. Computer aided alignment flow chart of R-C system

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Fig. 10. System wave aberration of full field after coarse alignment

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Fig. 11. Actual alignment site

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Fig. 12. System wave aberration of full field after fine alignment

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Table 1. Targets of optical system design
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Table 1. Targets of optical system design
Parameters Targets
Focal length /mm 1 500
Field of view /（°） ≥2
Entrance pupil diameter /mm ≥ϕ290
Waveband/nm 400 $~$ 700
Modulation transfer function >0.4 @62.5 lp/mm
Detector pixel size/ $μ m$ 8

Table 2. Structure parameters of optical system

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Table 2. Structure parameters of optical system

No.	Radius/mm	Thickness/mm	Glass	Conic coefficient $k$
OBJ	∞	∞
STO	-585.072	-191.748	MIRROR	-1.062 0
3	-249.189	359.521	MIRROR	-2.508 5
4	∞	-89.042	MIRROR
5	-181.179	-18.588	HLAK7A
6	-430.661	-29.129
7	354.851	-7.00	HLAF4
8	-855.707	-5.290 1
9	91.688	-5.937	HFK61
10	-793.753	-3.676
IMA	∞	-11.323

Table 3. Maladjustment of each degree
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Table 3. Maladjustment of each degree
$Δ x / m m$ $Δ y / m m$ $Δ z / m m$ $Δ α / (°)$ $Δ β / (°)$
0.1 0.1 0.1 0.1 0.1

Table 4. Sensitivity matrix

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Table 4. Sensitivity matrix

Aberration	Secondary mirror					Aberration	Third mirror
Aberration	$Δ x_{1}$	$Δ y_{1}$	$Δ z_{1}$	$Δ α_{1}$	$Δ β_{1}$	Aberration	$Δ x_{2}$	$Δ y_{2}$	$Δ z_{2}$	$Δ α_{2}$	$Δ β_{2}$
（0，0）Z₅	-0.007	0.007	0	0.047	-0.047	（0，0）Z₅	0	0	0	0	0
Z₆	0	0	0	0	0	Z₆	0	0	0	0	0
Z₇	-1.529	0	0	0	-2.444	Z₇	0.009	0	0	0	0.018
Z₈	0	-1.529	0	2.444	0	Z₈	0	0.009	0	-0.018	0
Z₉	0	0	0.196	0	0	Z₉	0	0	-0.000 8	0	0
（0，-0.05）Z₅	-0.007	0.015 1	0	-0.01	-0.048	（0，-1）Z₅	0	0.045	0	0.015	0
Z₆	-0.008	0	0	0	-0.057	Z₆	-0.044	0	0	0	0.015
Z₇	-1.529	0	0	0	-2.447	Z₇	0.009	0	0	0	0.018
Z₈	0	-1.529	0	2.444	0	Z₈	0	0.01	0	-0.018	0
Z₉	0	0	0.196	0	0	Z₉	0	0	-0.008	0	0
（0，+0.05）Z₅	-0.007	-0.001	0	0.109	-0.048	（0，+1）Z₅	0	-0.045	0	-0.013	0
Z₆	0.008	0	0	0	0.057	Z₆	0.044	0	0	0	-0.015
Z₇	-1.529	0	0	0	-2.44	Z₇	0.009	0	0	0	0.018
Z₈	0	-1.529	0	2.444	0	Z₈	0	0.01	0	-0.018	0
Z₉	0	0	0.196	0	0	Z₉	0	0	-0.008	0	0

Table 5. Zernike coefficients in full field after coarse alignment
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Table 5. Zernike coefficients in full field after coarse alignment
Z₅ Z₆ Z₇ Z₈ Z₉
F（0，0） -0.030 0.031 -0.004 -0.001 1 0.03
F（0，-1） -0.062 0.023 0.002 -0.012 -0.016
F（0，1） 0.125 0.039 -0.012 0.027 -0.018

Table 6. Misalignment calculation results of second mirror
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Table 6. Misalignment calculation results of second mirror
Misalignment value $Δ x / m m$ $Δ y / m m$ $Δ z / m m$ $Δ α / (°)$ $Δ β / (°)$
Calculated value -0.002 -0.023 -0.011 0.014 0.003

Table 7. Zernike coefficients in full field after fine alignment
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Table 7. Zernike coefficients in full field after fine alignment
Z₅ Z₆ Z₇ Z₈ Z₉
F（0，0） -0.016 0.010 0.001 0.012 0.006
F（0，-1） 0.021 0.019 0.004 0.008 -0.001
F（0，1） 0.033 0.020 0.006 -0.010 -0.008

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Taixi CHEN, Yanxiong WU. Design and Alignment of Airborne Compact Long Focal Length Optical System[J]. Acta Photonica Sinica, 2021, 50(11): 1111002

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Paper Information

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Received: May. 13, 2021

Accepted: Jun. 29, 2021

Published Online: Dec. 2, 2021

The Author Email: WU Yanxiong (364477424@qq.com)

DOI:10.3788/gzxb20215011.1111002

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology