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Optical gating techniques for material inspection

Optical gating techniques provide an important method for the non-destructive evaluation of a number of different transparent, translucent, and even highly scattering materials. We have used optical coherence tomography with 1.3 micrometers wavelength light to probe the subsurface region of ceramic, diamond film, single crystal silicon carbide, and other samples. We have demonstrated sample penetration depths of 100 to 1300 micrometers . We have achieved lateral spatial resolutions of 5 micrometers and depth resolutions of 10 micrometers . We have developed scanning techniques that allow planes in the sample to be imaged in less than 1 second and we have extended the scanning capabilities to allow for scanning over spherical convex or concave surfaces.