19 May 2003 Integration of magneto-rheological-finishing (MRF) technology for ultra-precision optical manufacturing
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Magneto-rheological-finishing (MRF) technology is capable of substantially improving the surface figure of spherical lens to about 1/20 wavelength. Nonetheless, since MRF technology is an ultra-fine polishing process, in which only less than a few microns of material will be removed per cycle, time for making an aspheric surface from a best-fit sphere can be very significant. The situation can be worse if the surface profile is considerably deviated from its best-fit spherical surface. This is not desirable for actual production, and thus a manufacturing cell is proposed to enhance the efficiency of the high precision lens manufacturing process. On the other hand, MRF was suggested to be an alternative for lapping of surface of ceramic lens mould insert. Rather than using the abrasive particles in typical lapping process, the magnetized slurry in MRF is moved past the rotating surface of mould insert locally under the computer-control process so as to achieve the desired surface form accuracy.
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Ashley M. H. Pon, Ashley M. H. Pon, } "Integration of magneto-rheological-finishing (MRF) technology for ultra-precision optical manufacturing", Proc. SPIE 10314, Optifab 2003: Technical Digest, 103140M (19 May 2003); doi: 10.1117/12.2284011; https://doi.org/10.1117/12.2284011

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