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Optimization method of manufacturing for diamond turning soft-brittle materials' harmonic diffractive optical

Xiang Gao, Changxi Xue, Yang Chao

    Applied Optics
    |December 28, 2020
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    Summary

    An optimized turning model enables high-quality manufacturing of harmonic diffractive optical elements (HDOEs) from soft-brittle materials. This method overcomes limitations of traditional techniques, expanding material options for advanced optical designs.

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    Area of Science:

    • Optical Engineering
    • Materials Science
    • Manufacturing Processes

    Background:

    • Single-point diamond turning is a cost-effective method for producing harmonic diffractive optical elements (HDOEs).
    • Traditional methods using half-round tools and small feed rates are effective for hard-brittle materials but unsuitable for soft-brittle materials due to feed rate constraints.
    • This limitation restricts the range of materials that can be used for HDOEs.

    Purpose of the Study:

    • To develop an optimized turning model for manufacturing HDOEs using soft-brittle materials.
    • To address the challenges of high surface roughness and strict feed rate requirements associated with soft-brittle materials.
    • To expand the applicability of HDOEs to a wider range of optical materials.

    Main Methods:

    • An optimized turning model was developed, considering the specific feed rate and cutting depth ranges for soft-brittle materials.
    • A mathematical model was established to correlate diffraction efficiency with period widths, tool radius, and feed rate for various soft-brittle optical materials.
    • Barium fluoride (BaF2), a representative soft-brittle material, was selected for experimental validation.

    Main Results:

    • The optimized turning model successfully produced barium fluoride HDOEs with a surface roughness (Ra) of 2.75 nm.
    • The model overcomes the high surface roughness issue associated with half-round tools while retaining their advantage in reducing surface-relief profile errors.
    • Experimental results validated the effectiveness of the optimized model.

    Conclusions:

    • The proposed optimized turning model is effective for manufacturing HDOEs from soft-brittle materials like barium fluoride.
    • This research provides theoretical guidance and engineering application for the optical manufacturing of HDOEs using soft-brittle materials.
    • The study broadens the range of applicable materials for HDOEs, enhancing the flexibility of advanced optical design.