High-resolution 3-D imaging of surface damage sites in fused silica with Optical Coherence Tomography

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In this work, we present the first successful demonstration of a non-contact technique to precisely measure the 3D spatial characteristics of laser induced surface damage sites in fused silica for large aperture laser systems by employing Optical Coherence Tomography (OCT). What makes OCT particularly interesting in the characterization of optical materials for large aperture laser systems is that its axial resolution can be maintained with working distances greater than 5 cm, whether viewing through air or through the bulk of thick optics. Specifically, when mitigating surface damage sites against further growth by CO{sub 2} laser evaporation of the damage, it ... continued below

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Guss, G; Bass, I; Hackel, R; Mailhiot, C & Demos, S G October 30, 2007.

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In this work, we present the first successful demonstration of a non-contact technique to precisely measure the 3D spatial characteristics of laser induced surface damage sites in fused silica for large aperture laser systems by employing Optical Coherence Tomography (OCT). What makes OCT particularly interesting in the characterization of optical materials for large aperture laser systems is that its axial resolution can be maintained with working distances greater than 5 cm, whether viewing through air or through the bulk of thick optics. Specifically, when mitigating surface damage sites against further growth by CO{sub 2} laser evaporation of the damage, it is important to know the depth of subsurface cracks below the damage site. These cracks are typically obscured by the damage rubble when imaged from above the surface. The results to date clearly demonstrate that OCT is a unique and valuable tool for characterizing damage sites before and after the mitigation process. We also demonstrated its utility as an in-situ diagnostic to guide and optimize our process when mitigating surface damage sites on large, high-value optics.

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PDF-file: 11 pages; size: 0.6 Mbytes

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  • Presented at: SPIE - Boulder Damage Symposium, Boulder, CO, United States, Sep 24 - Sep 26, 2007

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  • Report No.: UCRL-PROC-236270
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 923124
  • Archival Resource Key: ark:/67531/metadc896771

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Office of Scientific & Technical Information Technical Reports

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  • October 30, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 12:37 p.m.

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Guss, G; Bass, I; Hackel, R; Mailhiot, C & Demos, S G. High-resolution 3-D imaging of surface damage sites in fused silica with Optical Coherence Tomography, article, October 30, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc896771/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.