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    Pseudorandom orbiting stroke for freeform optics postprocessing

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    Author
    Guo, Xiangyu
    Shu, Yong
    Kim, Geon-Hee
    Palmer, Michael
    Choi, Heejoo
    Kim, Dae Wook
    Affiliation
    Univ Arizona, Dept Astron
    Univ Arizona, Steward Observ
    Univ Arizona, James C Wyant Coll Opt Sci
    Issue Date
    2019-04-17
    Keywords
    freeform optics
    postprocessing
    smoothing
    surface roughness
    pseudorandom orbiting stroke
    
    Metadata
    Show full item record
    Publisher
    SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
    Citation
    Xiangyu Guo, Yong Shu, Geon-Hee Kim, Michael Palmer, Heejoo Choi, and Dae Wook Kim "Pseudorandom orbiting stroke for freeform optics postprocessing," Optical Engineering 58(9), 092608 (17 April 2019). https://doi.org/10.1117/1.OE.58.9.092608
    Journal
    OPTICAL ENGINEERING
    Rights
    Copyright © 2019 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    In addition to achieving a desired freeform profile, ensuring a superb micro-roughness finish is a key factor for successful freeform optics manufacturing. We present a pseudorandom orbiting stroke-based postprocessing technique that maintains freeform optic forms, while improving small-scale surface quality. The full-aperture tool can avoid subaperture effects, and the small stroke pseudorandom tool path guarantees the match of freeform profiles while preventing the directionality of the final surface profiles. Three independent experimental studies are designed, conducted, and presented for a wide range of optics, including magnetorheological finishing-polished BK7 glass, single-point diamond turned (SPDT) poly(methyl methacrylate), and SPDT Al6061 optics. The comparison of direct measured maps on the initial and final smoothed optics verifies the form maintenance capability of the freeform optics postprocessing technology. Surface roughness measurement highlights improvements in local surface roughness and periodic toolmark errors left by the previous polishing method.
    ISSN
    0091-3286
    DOI
    10.1117/1.oe.58.9.092608
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1117/1.oe.58.9.092608
    Scopus Count
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    UA Faculty Publications

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