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Related Experiment Video

Updated: Jul 7, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

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Published on: May 25, 2016

Laser direct-write gray-level mask and one-step etching for diffractive microlens fabrication.

M R Wang, H Su

    Applied Optics
    |February 28, 2008
    PubMed
    Summary

    Increasing phase levels enhances diffractive optical elements. A novel laser direct-write gray-level mask and one-step etching technique produced high-efficiency diffractive microlenses with 94% focusing efficiency.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Microfabrication

    Background:

    • High-efficiency diffractive optical elements (DOEs) require increased phase levels.
    • Traditional fabrication methods can be complex and costly.

    Purpose of the Study:

    • To present a novel, efficient fabrication technique for high-efficiency diffractive optical elements.
    • To demonstrate the production of sixteen-phase-level diffractive microlenses and microlens arrays.

    Main Methods:

    • Laser direct-write gray-level mask fabrication on high-energy-beam-sensitive glass.
    • One-step etching of the gray-level mask plate.
    • Nonphotolithographic fabrication approach.

    Main Results:

    • Successfully fabricated sixteen-phase-level diffractive microlenses and microlens arrays.
    • Achieved a high focusing efficiency of approximately 94% for the fabricated elements.
    • Demonstrated the effectiveness of the one-step nonphotolithographic technique.

    Conclusions:

    • The presented technique enables the efficient production of high-efficiency diffractive optical elements.
    • Laser direct-write gray-level masks combined with one-step etching offer a viable alternative to conventional methods.
    • This fabrication approach is suitable for creating advanced optical components like diffractive microlenses.