title: Resolution-enhanced optical coherence tomography based on classical intensity interferometry.
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 sqrt 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.
authors.affiliation: Departamento de Optica, Universidad de Valencia, ES-46100 Burjasot, Spain.
authors.forename: Hanna
authors.initials: H
authors.lastname: Lajunen
authors.forename: Víctor
authors.initials: V
authors.lastname: Torres-Company
authors.forename: Jesús
authors.initials: J
authors.lastname: Lancis
authors.forename: Ari T
authors.initials: AT
authors.lastname: Friberg