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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Model laser damage precursors for high quality optical materials.

Nan Shen, Jeff D Bude, Christopher W Carr

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Fused silica surface damage initiates from sub-bandgap light absorption by native precursors. Strong adhesion of artificial absorbers to silica is crucial for initiating this absorption front and subsequent catastrophic damage.

    Area of Science:

    • Materials Science
    • Optical Engineering
    • Surface Physics

    Background:

    • Fused silica exhibits surface damage at optical fluences significantly below its intrinsic material limit.
    • Native surface precursors absorb sub-bandgap light, initiating a process leading to deep catastrophic damage with fracture networks.
    • The absorption front model explains nano-scale absorption leading to macro-scale damage, but experimental reproduction has been challenging.

    Purpose of the Study:

    • To investigate critical precursor properties for native surface damage initiation on fused silica.
    • To experimentally reproduce damage events using artificial absorbers on fused silica substrates.
    • To determine the role of interfacial properties in damage initiation.

    Main Methods:

    • Deposition of thin, optically absorbing films of various materials onto fused silica substrates.

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  • Experimental damage testing and characterization of the coated silica surfaces.
  • Simulations using the absorption-front model to compare with experimental findings.

    • Main Results:

    • Artificial absorbers were successfully created on fused silica surfaces.
    • Strong interfacial adhesion strength between the absorber films and the silica substrate was identified as crucial for damage initiation.
    • The experimental results qualitatively agreed with simulations based on the absorption-front model.

    Conclusions:

    • Artificial absorber systems can effectively model native surface damage initiation on fused silica.
    • Interfacial adhesion is a critical parameter for the absorption front mechanism and subsequent catastrophic optical damage.
    • This study provides a pathway for further experimental investigation into optical damage precursors.