Complex Master Slave Interferometry

Rivet, Sylvain and Maria, Michael and Bradu, Adrian and Feuchter, Thomas and Leick, Lasse and Podoleanu, Adrian (2016) Complex Master Slave Interferometry. Optics Express, 24 (3). pp. 2885-2904. ISSN 1094-4087. E-ISSN 1094-4087. (doi:https://doi.org/10.1364/OE.24.002885) (Full text available)

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http://dx.doi.org/10.1364/OE.24.002885

Abstract

A general theoretical model is developed to improve the novel Spectral Domain Interferometry method denoted as Master/Slave (MS) Interferometry. In this model, two functions, g and h are introduced to describe the modulation chirp of the channeled spectrum signal due to nonlinearities in the decoding process from wavenumber to time and due to dispersion in the interferometer. The utilization of these two functions brings two major improvements to previous implementations of the MS method. A first improvement consists in reducing the number of channeled spectra necessary to be collected at Master stage. In previous MSI implementation, the number of channeled spectra at the Master stage equated the number of depths where information was selected from at the Slave stage. The paper demonstrates that two experimental channeled spectra only acquired at Master stage suffice to produce A-scans from any number of resolved depths at the Slave stage. A second improvement is the utilization of complex signal processing. Previous MSI implementations discarded the phase. Complex processing of the electrical signal determined by the channeled spectrum allows phase processing that opens several novel avenues. A first consequence of such signal processing is reduction in the random component of the phase without affecting the axial resolution. In previous MSI implementations, phase instabilities were reduced by an average over the wavenumber that led to reduction in the axial resolution.

Item Type: Article
Uncontrolled keywords: (110.4500) Optical coherence tomography; (120.3890) Medical optics instrumentation; (110.4190) Multiple imaging; (170.4460) Ophthalmic optics and devices.
Subjects: Q Science > QC Physics > QC355 Optics
Q Science > QC Physics > QC411 Interference
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Adrian Bradu
Date Deposited: 05 Feb 2016 10:37 UTC
Last Modified: 16 Jan 2017 11:29 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/54018 (The current URI for this page, for reference purposes)
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