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Excimer-laser-induced densification in binary silica glasses.

N F Borrelli, C M Smith, D C Allan

    Optics Letters
    |December 15, 2007
    PubMed
    Summary

    The rate of laser-induced densification in metal-oxide-silica glasses increases with metal-oxide content and is influenced by glass softness. Laser wavelength significantly affects densification, with shorter wavelengths causing higher rates.

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    Area of Science:

    • Materials Science
    • Laser Physics
    • Glass Chemistry

    Background:

    • Excimer lasers are used for material processing.
    • Densification is a key property change in glasses under laser irradiation.
    • Understanding composition effects is crucial for material modification.

    Purpose of the Study:

    • To investigate the relationship between composition and excimer-laser-induced densification in binary metal-oxide-silica glasses.
    • To determine the influence of laser wavelength on the densification process.
    • To correlate densification rates with glass properties like annealing temperature.

    Main Methods:

    • Irradiation of binary metal-oxide-silica glasses with an excimer laser.
    • Varying the composition of the metal-oxide-silica system.
    • Analyzing the densification rate as a function of composition and laser wavelength.
    • Measuring annealing temperature as an indicator of glass softness.

    Main Results:

    • Densification rate strongly depends on the glass composition.
    • Increased metal-oxide content leads to a higher densification rate.
    • A strong correlation exists between densification rate and annealing temperature (glass softness).
    • Densification rate is highly dependent on excimer laser wavelength: 157nm > 193nm > 248nm.

    Conclusions:

    • The composition of binary metal-oxide-silica glasses significantly controls excimer-laser-induced densification.
    • Glass softness, indicated by annealing temperature, is a key factor in laser-induced densification.
    • Excimer laser wavelength is a critical parameter, with shorter wavelengths being more effective for densification.

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