Infrared and Laser Engineering, Volume. 52, Issue 4, 20230053(2023)
Compensation mechanism of primary mirror and the third mirror figure error of off-axis three-mirror telescope
Figures & Tables(18)
Fig. 1. (a) Trajectory of incident light with a non-aperture mirror; (b) Pupil vector relation diagram at non-stop position
Fig. 2. Schematic diagram of optical layout of the off-axis TMA telescope and five fields of views used in aberration compensation
Fig. 3. Full field displays (FFDs) for astigmatism in different PM states
Fig. 9. The values of RMS before and after compensation of the five fields of view and the nominal state. (a)
Table 1. Optical parameters of off-axis TMA telescope
View tableView in ArticleTable 1. Optical parameters of off-axis TMA telescope
Surface Conic constant Radius/mm Thickness/mm PM −0.921 −3600.41 −1551.777 SM −4.828 −910.903 1558.7 TM −0.292 −1219.431 −1533.359 Image − Infinity
Table 2. Wave aberration coefficients of SM for the off-axis TMA telescope (
λ =632.8 nm)View tableView in ArticleTable 2. Wave aberration coefficients of SM for the off-axis TMA telescope (
λ =632.8 nm)Surface $W_{222,{\rm{SM}}}^{{\rm{sph}}}$ $W_{222,{\rm{SM}}}^{{\rm{asph}}}$ $W_{131,{\rm{SM}}}^{{\rm{sph}}}$ $W_{131,{\rm{SM}}}^{{\rm{asph}}}$ SM −28.28 54.21 196.86 224.59
Table 3. Introduced Zernike coefficients for figure error on PM of the off-axis TMA system
View tableView in ArticleTable 3. Introduced Zernike coefficients for figure error on PM of the off-axis TMA system
$C_5^{{\rm{PM}}}/\lambda$ $C_6^{{\rm{PM}}}/\lambda$ $C_7^{{\rm{PM}}}/\lambda$ $C_8^{{\rm{PM}}}/\lambda$ 0.5 0.6 0.4 0.5
Table 4. The adjustment of SM in compensating PM figure error
View tableView in ArticleTable 4. The adjustment of SM in compensating PM figure error
$XD{E_{{\rm{SM}}} }/{\rm{mm}}$ $YD{E_{{\rm{SM}}} }/{\rm{mm}}$ $AD{E_{ {\rm{SM} } } }/ (^\circ)$ $BD{E_{ {\rm{SM} } } }/ (^\circ)$ −0.0584 −0.061 −0.0074 0.0077
Table 5. RMS value of system before and after compensation of surface figure error
View tableView in ArticleTable 5. RMS value of system before and after compensation of surface figure error
RMS/λ F1 F2 F3 F4 F5 Before compensation 0.1864 0.1772 0.1624 0.1682 0.1649 After compensation 0.0851 0.0783 0.0812 0.0642 0.0816
Table 6. Introduced Zernike coefficients for figure error on TM of the off-axis TMA system
View tableView in ArticleTable 6. Introduced Zernike coefficients for figure error on TM of the off-axis TMA system
$C_5^{{\rm{TM}}}/\lambda$ $C_6^{{\rm{TM}}}/\lambda$ $C_7^{{\rm{TM}}}/\lambda$ $C_8^{{\rm{TM}}}/\lambda$ 0.1 −0.08 0.05 0.05
Table 7. The adjustment of SM in compensating TM figure error of the off-axis TMA system
View tableView in ArticleTable 7. The adjustment of SM in compensating TM figure error of the off-axis TMA system
$XD{E_{{\rm{SM}}} }/{\rm{mm} }$ $YD{E_{{\rm{SM}}} }/{\rm{mm} }$ $AD{E_{ {\rm{SM} } } }/(^\circ)$ $BD{E_{ {\rm{SM} } } }/ (^\circ)$ −0.083 −0.046 0.035 −0.067
Table 8. RMS value of system before and after compensation of surface figure error
View tableView in ArticleTable 8. RMS value of system before and after compensation of surface figure error
RMS/λ F1 F2 F3 F4 F5 Before compensation 0.3175 0.3561 0.2749 0.2344 0.2795 After compensation 0.1092 0.1041 0.0940 0.1388 0.1038
Table 9. The range of
x /y astigmatism andx /y coma coefficient of TM figure errorView tableView in ArticleTable 9. The range of
x /y astigmatism andx /y coma coefficient of TM figure error$C_5^{{\rm{TM}}}/\lambda$ $C_6^{{\rm{TM}}}/\lambda$ $C_7^{{\rm{TM}}}/\lambda$ $C_8^{{\rm{TM}}}/\lambda$ ±0.03 ±0.03 ±0.03 ±0.03
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Mingze Ma, Xu He, Jinxin Wang, Jing Luo, Tianxiao Xu, Cui Lin, Haoran Zhou. Compensation mechanism of primary mirror and the third mirror figure error of off-axis three-mirror telescope[J]. Infrared and Laser Engineering, 2023, 52(4): 20230053
Paper Information
Category: Optical design
Received: Feb. 7, 2023
Accepted: --
Published Online: Jul. 4, 2023
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