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In ultra-high resolution (UHR-) optical coherence tomography (OCT) groupvelocity dispersion (GVD) must be corrected for in order to approach thetheoretical resolution limit. One approach promises not only compensation, butcomplete annihilation of even order dispersion effects, and that at all sampledepths. This approach has hitherto been demonstrated with an experimentallydemanding 'balanced detection' configuration based on using two detectors. Wedemonstrate intensity correlation (IC) OCT using a conventional spectral domain(SD) UHR-OCT system with a single detector. IC-SD-OCT configurations exhibitcross term ghost images and a reduced axial range, half of that of conventionalSD-OCT. We demonstrate that both shortcomings can be removed by applying anovel generic artefact reduction algorithm and using analytic interferograms.We show the superiority of IC-SD-OCT compared to conventional SD-OCT by showinghow IC-SD-OCT is able to image spatial structures behind a strongly dispersivesilicon wafer. Finally, we question the resolution enhancement of square root 2that IC-SD-OCT is often believed to have compared to SD-OCT. We show that thisis simply the effect of squaring the reflectivity profile as a natural resultof processing the product of two intensity spectra instead of a singlespectrum.

All-depth dispersion cancellation in spectral domain optical coherence tomography using numerical intensity correlations