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Related Experiment Video

Updated: Jul 6, 2026

Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition
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Published on: December 21, 2015

Transient absorption in excimer-exposed silica.

C M Smith, N F Borrelli, R J Araujo

    Applied Optics
    |March 21, 2008
    PubMed
    Summary

    High-purity fused silica exposed to 193-nm excimer laser light shows absorption changes. Dissolved molecular hydrogen content and processing significantly influence transient absorption and recovery, impacting optical properties.

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    Area of Science:

    • Materials Science
    • Optical Materials
    • Laser-Induced Effects

    Background:

    • Fused silica is crucial for optical applications, but its properties can degrade under laser irradiation.
    • Understanding transient absorption is vital for predicting material lifetime and performance.

    Purpose of the Study:

    • To investigate transient absorption in high-purity fused silica induced by 193-nm excimer laser exposure.
    • To determine the influence of dissolved molecular hydrogen and hydrogen-related processing on absorption dynamics.

    Main Methods:

    • Exposure of fused silica samples to a 193-nm excimer laser.
    • Varying exposure levels, dissolved molecular hydrogen concentration, and hydrogen processing conditions.
    • Analysis of transient absorption spectra and transmittance recovery.

    Main Results:

    • Long-term transmittance recovery correlates with dissolved molecular hydrogen concentration.
    • Short-term absorption fade is attributed to geminate recombination of E? centers and H radicals.
    • Redarkening results from SiH photolysis, regenerating color centers.
    • Hydrogen processing creates a precursor, identified by Raman spectroscopy, causing an absorption spike.

    Conclusions:

    • Dissolved molecular hydrogen is key for long-term transmittance recovery in laser-exposed fused silica.
    • Specific processing steps can introduce precursors that affect optical stability at 193 nm.
    • The study elucidates mechanisms of laser-induced absorption and recovery in fused silica.

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