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

Gabe Guss, Isaac Bass, Richard Hackel, Christian Mailhiot, Stavros G. Demos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

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 CO2 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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6720
DOIs
StatePublished - 2008
Externally publishedYes
Event39th Annual Symposium on Optical Materials for High-Power Lasers - Boulder, CO, United States
Duration: Sep 24 2007Sep 26 2007

Other

Other39th Annual Symposium on Optical Materials for High-Power Lasers
CountryUnited States
CityBoulder, CO
Period9/24/079/26/07

Keywords

  • Fused silica
  • Optical coherence tomography
  • Surface damage

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'High-resolution 3-D imaging of surface damage sites in fused silica with Optical Coherence Tomography'. Together they form a unique fingerprint.

  • Cite this

    Guss, G., Bass, I., Hackel, R., Mailhiot, C., & Demos, S. G. (2008). High-resolution 3-D imaging of surface damage sites in fused silica with Optical Coherence Tomography. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6720). [67201F] https://doi.org/10.1117/12.748452