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Latent image volumetric additive manufacturing.

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    Volumetric additive manufacturing (VAM) striations are caused by a self-written waveguide effect. A uniform optical exposure mitigates these defects, improving print quality and speed for advanced 3D printing applications.

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    Area of Science:

    • Additive Manufacturing
    • Optical Engineering
    • Materials Science

    Background:

    • Volumetric additive manufacturing (VAM) offers rapid 3D printing without inherent layering.
    • VAM is limited by striations, causing mechanical and optical inhomogeneity.
    • These striations resemble layers, hindering VAM applications.

    Purpose of the Study:

    • To investigate the cause of striations in VAM.
    • To develop a method for mitigating VAM-induced striations.
    • To improve the speed and material range of VAM.

    Main Methods:

    • Hypothesized striations result from a self-written waveguide effect due to material nonlinearity.
    • Introduced a uniform optical exposure step post-VAM printing.
    • Evaluated the impact of this method on striation reduction and print completion time.

    Main Results:

    • Demonstrated that a uniform optical exposure effectively mitigates VAM striations.
    • Showed this method shortens the overall print completion time.
    • Observed an expansion in the range of printable resins and improved part integrity.

    Conclusions:

    • Striations in VAM are attributed to a self-written waveguide effect, not beam patterning.
    • A simple post-printing optical exposure is an effective solution for VAM striations.
    • This technique enhances VAM's practicality by improving speed, material compatibility, and part quality.