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Resolution-enhanced optical coherence tomography based on classical intensity interferometry

Hanna Lajunen, Víctor Torres-Company, Jesús Lancis, and Ari T. Friberg

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Abstract

We propose a fourth-order interference scheme for optical coherence tomography operating with broadband incoherent (or quasi-incoherent) light. It is shown that using this proposal, an axial resolution improvement by a factor of 2 and a better sensitivity for weakly reflecting samples are obtained than with the standard second-order correlation scheme. From a practical perspective, we suggest the use of broadband Q-switched pulses and performing ultrafast intensity correlation with a nonlinear crystal. The global performance of our proposal is illustrated by means of numerical simulations.

© 2009 Optical Society of America

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