Akinetic swept source with adjustable coherence length for SS-OCT

Stancu, R.F. and Jackson, D.A. and Podoleanu, A.G. (2015) Akinetic swept source with adjustable coherence length for SS-OCT. In: Proceedings of SPIE. SPIE ISBN 978-1-62841-402-8. (doi:https://doi.org/10.1117/12.2077640) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://www.dx.doi.org/10.1117/12.2077640

Abstract

An electronically controlled optical swept source (SS) at 1550 nm using mode locking in a dispersive ring cavity is described. Active mode-locking was achieved by directly modulating the current of a semiconductor optical amplifier (SOA) used as a gain medium. In the static regime, parameters such as linewidth, tuning bandwidth and contrast were measured, while the axial range was determined dynamically. Two types of fiber, dispersion compensation and single mode, are employed in the laser ring cavity. It is demonstrated that the relative lengths of the two types of fiber have little effect on the linewidth, while more control on the linewidth is obtained via the frequency of the signal driving the SOA. Linewidths less than 60 pm and over 1 nm were measured in the static regime while driving the SOA at 50-500 MHz. The narrowest linewidths were achieved where the proportion of dispersion compensation fiber in the cavity is 80-90% of the total length. The optical source is developed to respond to the demands of OCT applications in general as well as address the need for low cost tunable lasers for configurations where a large tuning bandwidths and long coherence length might not be necessary. © 2015 SPIE.

Item Type: Conference or workshop item (Proceeding)
Additional information: This is available as OPEN ACCESS by clicking on the URL.
Uncontrolled keywords: Akinetic swept source, Coherence length, Dispersive medium, Mode-locking, Ring cavity, Bandwidth, Dispersion compensation, Laser mode locking, Light amplifiers, Linewidth, Locks (fasteners), Semiconductor lasers, Semiconductor optical amplifiers, Tomography, Tuning, Active mode locking, Coherence lengths, Dispersion-compensation fibers, Dispersive medium, Long coherence length, Relative length, Ring cavities, Swept source, Optical tomography
Subjects: Q Science > QC Physics
Q Science > QC Physics > QC355 Optics
R Medicine > R Medicine (General) > R857.O6 Optical coherence tomography
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Giles Tarver
Date Deposited: 10 Jul 2015 10:25 UTC
Last Modified: 09 Feb 2017 11:03 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49273 (The current URI for this page, for reference purposes)
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