Multi -tool selection model for the error control of mid -to -high frequency and rapid fabrication on large-scale aspheric optics

Aspheric optics has been widely used in the space telescope system. The large amount of material removal and mid-frequency errors district the high-precision and high-efficiency fabrication of large-scale aspheric optics. On the basis of parsing the figuring ability of tool influence functions (TIFs) and principles of smoothing polishing technology, the multi-TIFs process is proposed in this paper. Then the selection principle and replacement time of TIFs have been discussed. Furthermore, the multi-TIFs process is optimized with frequency filtering method. This filtering method with multi-TIFs can obtain better surface accuracy in a faster way compared to the traditional method. Finally, a Phi 540mm SiC off-axis aspheric mirror is polished to verify the proposed method.