[1] Ye J F, Xu K D, Yang M Z et al. Design of off-axis head-mounted display optical system based on two reflective optical free-form surfaces[J]. Acta Optica Sinica, 38, 0722003(2018).

[2] Guan S, Wang C, Tong S F et al. Optical antenna design of off-axis two-mirror reflective telescope with freeform surface for space laser communication[J]. Infrared and Laser Engineering, 46, 1222003(2017).

[3] Ni D W, Li X Y, Yang M Y et al. Large field of view space-based optical detection system based on freeform surfaces[J]. Acta Optica Sinica, 38, 1122003(2018).

[4] Jiang X, Scott P, Whitehouse D. Freeform surface characterisation-a fresh strategy[J]. CIRP Annals, 56, 553-556(2007). http://www.sciencedirect.com/science/article/pii/S0007850607001333

[5] Fang F Z, Zhang X D, Hu X T. Cylindrical coordinate machining of optical freeform surfaces[J]. Optics Express, 16, 7323-7329(2008).

[6] Kenneth G, Bruegge T, Hoffman J et al. Design tools for freeform optics[J]. Proceedings of SPIE, 5874, 58740A(2005).

[7] Xu K, Jia Z G, Fang F Z. Measurement of transmission wavefront aberration of freeform spectacle lenses in real viewing condition of human eye[J]. Acta Optica Sinica, 38, 0212001(2018).

[8] Zhu L L, Li Z X, Fang F Z et al. Review on fast tool servo machining of optical freeform surfaces[J]. The International Journal of Advanced Manufacturing Technology, 95, 2071-2092(2018).

[9] Yu D P, Wong Y S, Hong G S. Optimal selection of machining parameters for fast tool servo diamond turning[J]. The International Journal of Advanced Manufacturing Technology, 57, 85-99(2011).

[10] Kim H S, Kim E J, Song B S. Diamond turning of large off-axis aspheric mirrors using a fast tool servo with on-machine measurement[J]. Journal of Materials Processing Technology, 146, 349-355(2004).

[11] Wu Q H, Sun Y Z, Chen W Q et al. Theoretical and experimental investigation of spindle axial drift and its effect on surface topography in ultra-precision diamond turning[J]. International Journal of Machine Tools and Manufacture, 116, 107-113(2017).

[12] Li R B, Zhang Z H, Du X et al. Ultra-precision machining technology of freeform optics and its applications[J]. Infrared and Laser Engineering, 39, 110-115(2010).

[13] Guan C L, Dai Y F, Yin Z Q. Freeform surface optical components machining by slow tool servo diamond turning[J]. Laser & Optoelectronics Progress, 47, 022202(2010).

[14] Yu H J. Theoretical and technological research on optical freeform surface of single point diamond ultra-precision turning[D]. Changchun: Jilin University, 19-30(2015).

[15] Guan C L, Tie G P, Yin Z Q. Fabrication of array lens optical component by using of slow tool servo diamond turning[J]. Journal of National University of Defense Technology, 31, 31-35, 47(2009).

[16] Yin Z Q, Dai Y F, Li S Y et al. 51(5): 404-410. n(2011).