[2] FORBES G W. Shape specification for axially symmetric optical surfaces[J]. Optics Express, 2007, 15(8): 5218-5226．

[6] ALIKENS D M, WOLFE C R. Use of power spectral density(PSD)functions in specifying optics for the National Ignition Facility[C]//Proc.of SPIE, 1995, 2576: 2812292.

[7] BRAY M. Stitching interferometry: how and why it works[C]//Proc. of SPIE, 1999, 3739: 259-273．

[20] TIAN F, YIN Z, LI S. Fast tool servo diamond turning of optical freeform surfaces for rear-view mirrors[J]. The International Journal of Advanced Manufacturing Technology, 2015, 80(9): 1759-1765.

[23] WANG Q F, CHENG D W, WANG W T, et al. Design, tolerance, and fabrication of an optical see-through head-mounted display with freeform surface elements[J]. Applied Optics, 2013, 52(7): C88.

[27] MENG Q Y, WANG H Y, LIANGW J, et al. Design of off-axis threemirror systems with ultrawide field of view based on an expansion process of surface free-form and field of view[J]. Applied Optics, 2019, 58(3): 609-615.