Share Email Print
cover

Proceedings Paper

High-resolution 3D imaging of surface damage sites in fused silica with optical coherence tomography
Author(s): Gabe Guss; Isaac Bass; Richard Hackel; Christian Mailhiot; Stavros G. Demos
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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.

Paper Details

Date Published: 20 December 2007
PDF: 10 pages
Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67201F (20 December 2007); doi: 10.1117/12.748452
Show Author Affiliations
Gabe Guss, Lawrence Livermore National Lab. (United States)
Isaac Bass, Lawrence Livermore National Lab. (United States)
Richard Hackel, Lawrence Livermore National Lab. (United States)
Christian Mailhiot, Lawrence Livermore National Lab. (United States)
Stavros G. Demos, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 6720:
Laser-Induced Damage in Optical Materials: 2007
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

© SPIE. Terms of Use
Back to Top