Author Affiliations
1 Institute of Space Optoelectronics Technology, Changchun University of Science and Technology, Changchun, Jilin 130022, China2 Key Laboratory of Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, Chinashow less
Fig. 1. Equivalent aperture offset vector in the pupil off-axis freeform system
Fig. 2. Astigmatism FFDs of the pupil off-axis system. (a) Spherical system without spherical aberration; (b) freeform surface system with Z5/6
Fig. 3. Distribution of pupil off-axis freeform system with Z7/8. (a) Position of the symmetrical center of two nodes; (b) FFDs of astigmatism
Fig. 4. FFDs of coma. (a) Pupil off-axis spherical system; (b) pupil off-axis freeform system with Z7/8
Fig. 5. Two nodes distribution of pupil off-axis freeform system with Z9. (a) q<0; (b) q>0
Fig. 6. FFDs of coma. (a) Pupil off-axis spherical system; (b) pupil off-axis freeform system with Z9
Fig. 7. Effect of different residual aberrations on PSF ellipticity. (a) Residual spherical aberration; (b) residual coma after correcting astigmatism; (c) residual astigmatism after correcting coma; (d) residual coma and astigmatism
Fig. 8. Initial configuration of the pupil off-axis optical system
Fig. 9. (a) FFDs of astigmatism distribution of the conic system; (b) PSF ellipticity of the full field
Fig. 10. Effect of different Zernike coefficients on PSF ellipticity
Fig. 11. Layout of the optimized system
Fig. 12. (a) Third-order astigmatism FFDs of the optimized system; (b) third-order coma FFDs of the optimized system
Fig. 13. (a) Full field PSF ellipticity of the optimized system; (b) RMS value of the wavefront error
Fig. 14. MTF curves of the optimized system
Effective focal length | Pupil diameter | Field of view | PSF ellipticity |
---|
25 m | 2 m | 1.2°×1.2° | <0.15 |
|
Table 1. Specifications of the optical system