Fast scanning transmissive delay line for optical coherence tomography

Rosa, Carla C.; Rogers, John A.; Podoleanu, Adrian Gh.

doi:10.1364/ol.30.003263

Cited by 55 publications

(20 citation statements)

References 7 publications

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“…In addition, the configuration suggested operates in transmission, which makes it compatible with balance detection schemes using recirculation of the reference beam [41].…”

Section: Other Contributions To Td-octmentioning

confidence: 99%

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Route to OCT from OFS at University of Kent

Podoleanu

2011

Photonic Sens

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“…In addition, the configuration suggested operates in transmission, which makes it compatible with balance detection schemes using recirculation of the reference beam [41].…”

Section: Other Contributions To Td-octmentioning

confidence: 99%

“…A lower loss transmissive grating-based scanning spectral delay line was proposed [61]. This is especially suited to fit recirculating paths in OCT balanced configurations.…”

Section: Spectral Scanning Delay Linementioning

confidence: 99%

Route to OCT from OFS at University of Kent

Podoleanu

2011

Photonic Sens

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“…This works in transmission and exhibits low losses by traversing the diffraction grating ͑DG͒ only twice. 14 The delay line uses a DG, an achromat lens ͑L͒ and a galvanometer scanner ͑GS͒ in a 2f configuration. The DG disperses a collimated beam, which is then imaged by L at a distance f away.…”

Section: Experimental Configurationmentioning

confidence: 99%

Quasi-simultaneous optical coherence tomography and confocal imaging

et al. 2008

Self Cite

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A new approach of acquiring quasi-simultaneous optical coherence tomography (OCT) and confocal images is presented. The two images are generated using different principles, OCT and confocal microscopy. When the system is used to image the retina, the two images have depth resolutions, at present, of <20 microm and approximately 1 mm, respectively. The acquisition and display of en face OCT and confocal images are quasi-simultaneous, without the need of a beamsplitter. By using a chopper to periodically obstruct the reference beam in the OCT interferometer, synchronized with the XY-transversal scanner, much higher acquisition speed is obtained than in a previous report where we flipped an opaque screen in the reference arm of the interferometer. Successful operation of the novel configuration was achieved by: (1) stable synchronization of the chopper's movement with the horizontal line scanner and (2) fast self-adjusting of the gain value of avalanche photodiodes, depending on the optical power. Images from coin, leaves, and retina in vivo have been collected to demonstrate the functionality of the system.

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“…In terms of hardware solutions, a spectrometer using a prism after the diffraction grating [3,4], or chirped sampling using an analogue line scan camera [5] were proposed. Several solutions have also been proposed to compensate for dispersion, using matched lengths of glass [6], spectral delay line [7], fiber Bragg gratings [8]. In terms of software solutions, several methods have also been developed to resample and organize the data linearly along the optical frequency axis, or wavenumber, prior to the FT. Common corrections are based on the interpolation of the phase in order to obtain linearity in k-space [9].…”

Section: Introductionmentioning

confidence: 99%

Complex master slave interferometry

Rivet¹,

Maria²,

Bradu³

et al. 2016

Opt. Express

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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.

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Fast scanning transmissive delay line for optical coherence tomography

Cited by 55 publications

References 7 publications

Route to OCT from OFS at University of Kent

Route to OCT from OFS at University of Kent

Quasi-simultaneous optical coherence tomography and confocal imaging

Complex master slave interferometry

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