[1] Rodgers J M. Unobscured mirr designs [C]Proceedings of SPIE, 2002, 4832: 3360.

[2] T Yang, J Zhu, W Hou, et al. Design method of freeform off-axis reflective imaging systems with a direct construction process. Opt Express, 22, 9193-9205(2014).

[3] Fenggang Xu, Wei Huang, Mingfei Xu. Design of off-axis three-mirror optical system based on Wassermann-Wolf equations. Acta Optica Sinica, 36, 1222002(2016).

[4] Tong Yang, Jun Zhu, Guofan Jin. Starting configuration design method of freeform imaging and afocal systems with a real exit pupil. Applied Optics, 55, 345-353(2016).

[5] Chao Cao, Sheng Liao, Zhiyuan Liao, et al. Design of cooled freeform-surface off-axis reflective optical system. Acta Optica Sinica, 35, 1122001(2019).

[6] Jun Zhu, Wei Hou, Xiaodong Zhang, et al. Design of a low F-number freeform off-axis three-mirror system with rectangular field-of-view. Journal of Optics, 17, 015605(2015).

[7] N Takayuki, T Yasuhisa. Configuration of an off-axis three-mirror system focused on compactness and brightness. Applied Optics, 44, 776-783(2005).

[8] Elazhary T T. Generalized pupil aberrations of optical imaging systems [D]. Arizona: University of Arizona, 2014.

[9] Pan Junhua. The Design, Manufacture Test of the Aspherical Optical Surface [M]. Suzhou: Soochow University Press, 2004. (in Chinese)

[10] Lingying Chang, Qiang Zhang, Yuehong Qiu, et al. Design of telecentric relay optical system with broadband and real entrance pupil. Infrared and Laser Engineering, 50, 20210091(2021).

[11] Ningyan Xu, Lu Chen, Jing Huang, et al. Review of design methodology for starting-point of freeform surface imaging optical system. Infrared and Laser Engineering, 51, 20210852(2022).

[12] K Fuerschbach, G E Davis, K P Thompson, et al. Assembly of a freeform off-axis optical system employing three φ-polynomial Zernike mirrors. Opt Lett, 39, 2896-2899(2014).