High-resolution 3D imaging of surface damage sites in fused silica with optical coherence tomography

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

doi:10.1117/12.748452

20 December 2007 High-resolution 3D imaging of surface damage sites in fused silica with optical coherence tomography

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

Proceedings Volume 6720, Laser-Induced Damage in Optical Materials: 2007; 67201F (2007) https://doi.org/10.1117/12.748452
Event: Boulder Damage Symposium XXXIX: Annual Symposium on Optical Materials for High Power Lasers, 2007, Boulder, Colorado, United States

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.

Citation Download Citation

Gabe Guss, Isaac Bass, Richard Hackel, Christian Mailhiot, and Stavros G. Demos "High-resolution 3D imaging of surface damage sites in fused silica with optical coherence tomography", Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67201F (20 December 2007); https://doi.org/10.1117/12.748452

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