Assembly-Alignment and Compensation of Imperfect Imaging Off-Axis Three Mirror System

Table 1. Parameters of off-axis three mirror system
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Table 1. Parameters of off-axis three mirror system
Surface No. Radius /mm Thickness /mm Coinc Off-axisdistance /mm
1 3539.834 780.272 -2.934 360
2 1028.186 -750.195 0 0
3 1631.325 97.789 0.156 -326

Table 2. Zernike coefficients of off-axis three mirror system
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Table 2. Zernike coefficients of off-axis three mirror system
Zernike coefficient Value
Z₁ 1.24736426
Z₂ 0.00000001
Z₃ -2.76264936
Z₄ -0.07012538
Z₅ -10.98475152
Z₆ 0
Z₇ 0.00000001
Z₈ -1.12189271
Z₉ -1.31055951

Table 3. Parameters of compensation system
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Table 3. Parameters of compensation system
Radius /mm Value
r₁ -773.25940
r₂ -712.01562
r₃ 1822.65188
r₄ ∞
r₅ 216.36512
r₆ 165.02877

Table 4. Zernike coefficients of system after compensation
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Table 4. Zernike coefficients of system after compensation
Zernike coefficient Value
Z₁ 0.07354147
Z₂ 0
Z₃ 0.26921479
Z₄ 0.02506546
Z₅ 0.10500902
Z₆ 0
Z₇ 0
Z₈ 0.18203598
Z₉ -0.00251145

Table 5. Tolerance parameters

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Table 5. Tolerance parameters

Lens	Refractiveindex	Offsettingdistance /mm	Angle ofinclination /(°)	Thickness /mm	Radius ofcurvature /mm	RMS surfaceerror /λ
First compensation lens	0.0005	±0.01	±0.001	±0.02	0.1	1/30
Second compensation lens	0.0005	±0.01	±0.001	±0.02	0.1	1/30
Third compensation lens	0.0005	±0.01	±0.001	±0.02	0.1	1/30

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Zhaoyang Li, Mingyong Hu, Qian Bai, Zhiwei Feng, Chenkai Liu, Xiaobo Cai, Dongqi Sun. Assembly-Alignment and Compensation of Imperfect Imaging Off-Axis Three Mirror System[J]. Acta Optica Sinica, 2021, 41(4): 0422001

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