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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Composite laser beam separation technology for brittle transparent materials.

Tianting Chen, Jun Duan, Wei Xiong

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    |February 15, 2022
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    Summary

    A new composite laser beam separation (CLBS) technology uses two lasers to quickly cut brittle materials like glass. This method achieves high-quality, smooth edges with minimal chipping, offering a novel laser-based material processing approach.

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    Area of Science:

    • Materials Science
    • Laser Physics
    • Manufacturing Engineering

    Background:

    • Laser-based material processing is crucial for precise manufacturing.
    • Separating brittle transparent materials like glass presents challenges due to potential defects.
    • Existing laser separation methods may lack speed or surface quality.

    Purpose of the Study:

    • To develop a novel laser technology for fast and high-quality separation of brittle transparent materials.
    • To analyze the separation mechanism of the developed technology.
    • To evaluate the quality and speed of the separation process.

    Main Methods:

    • Development of Composite Laser Beam Separation (CLBS) technology by combining a picosecond Bessel laser and a continuous-wave (CW) fiber Gaussian laser.
    • Separation of 1-mm-thick soda lime glass using the CLBS technology.
    • Analysis of the CLBS separation mechanism and evaluation of the separated surface quality.

    Main Results:

    • CLBS technology achieved separation of soda lime glass with a surface quality similar to frosted polishing.
    • Edge chipping on the separated upper surface was minimal (≤ 0.5 µm).
    • Separated sidewalls were flat and smooth, exhibiting no defects like cracks or broken edges, with a surface roughness (Ra) of 0.12 µm.
    • A separation speed of 12 mm/s was reached, with potential for further improvement.

    Conclusions:

    • CLBS technology offers a new, effective method for laser separation of brittle transparent materials.
    • The developed technology provides high precision, speed, and excellent surface quality in material separation.
    • This research opens new avenues for laser applications in the precise processing of challenging materials.