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Sparse bi-step raster path for suppressing the mid-spatial-frequency error by fluid jet polishing.

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    Fluid jet polishing (FJP) effectively removes periodic ripple errors using a novel bi-step raster path (BSRP). This method significantly reduces mid-spatial-frequency errors without degrading optical surface quality.

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    Area of Science:

    • Optical Engineering
    • Precision Manufacturing

    Background:

    • Periodic ripple errors (mid-spatial-frequency errors) limit high-performance optical systems.
    • Fluid jet polishing (FJP) is non-contact but faces challenges with spot size and efficiency.

    Purpose of the Study:

    • Investigate FJP's efficacy in removing sub-aperture polishing ripple errors.
    • Develop and validate a novel polishing path for efficient error reduction.

    Main Methods:

    • Developed a mathematical model using complex spectrum optimization.
    • Proposed and implemented a sparse bi-step raster path (BSRP).
    • Experimental validation of BSRP for mid-spatial-frequency error suppression.

    Main Results:

    • BSRP effectively suppresses the first two-order peaks of the error spectrum.
    • Significant reduction in mid-spatial-frequency errors observed.
    • Surface form and roughness remained unaffected by BSRP processing.

    Conclusions:

    • FJP with BSRP offers an efficient method for periodic ripple error removal.
    • The BSRP approach enhances FJP applicability and mid-spatial-frequency error suppression.
    • Validated BSRP as a viable technique for improving optical system performance.