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Proceedings Paper

Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier
Author(s): Nik Krstajic; David Childs; Negin Peyvast; Deepa Kasaragod; Stephen J. Matcher; Igor Krestnikov; Richard Hogg
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Paper Abstract

We describe a simple swept-laser design that characterizes the emission bandwidth, linewidth, spectral shape and output noise. A short cavity Littmann configuration is used in which the semiconductor optical amplifier (SOA) lasing wavelength is tuned by a galvanometer with an 830 grooves per mm diffraction grating. A 3dB coupler extracts light from the cavity formed by the grating and end-mirror and the optical output uses to illuminate a balanced swept source optical coherence tomography (SS-OCT) interferometer incorporating a circulator, 3dB coupler, dispersion compensator and balanced detector. The SOA (SOA-1200-70-PM-20sB, Innolume GmbH) uses a novel III-V semiconductor quantum-dot gain medium. ASE is emitted between 1150nm and 1300nm at a drive current of 700mA. When used in the Littmann cavity laser a coherence length of about 10mm is produced, which is tunable over 60nm. The peak output power is 12mW. The swept-laser has been incorporated into a fiber-based SS-OCT system and used to image biological tissues. Axial resolution in air is 12 microns. Images of human palmar skin in-vivo are demonstrated, showing good resolution and contrast, with the stratum corneum, epidermis, rete ridges and epidermal-dermal junction visualized.

Paper Details

Date Published: 1 June 2011
PDF: 6 pages
Proc. SPIE 8091, Optical Coherence Tomography and Coherence Techniques V, 80911S (1 June 2011); doi: 10.1117/12.889247
Show Author Affiliations
Nik Krstajic, The Univ. of Sheffield (United Kingdom)
David Childs, The Univ. of Sheffield (United Kingdom)
Negin Peyvast, The Univ. of Sheffield (United Kingdom)
Deepa Kasaragod, The Univ. of Sheffield (United Kingdom)
Stephen J. Matcher, The Univ. of Sheffield (United Kingdom)
Igor Krestnikov, Innolume GmbH (Germany)
Richard Hogg, The Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 8091:
Optical Coherence Tomography and Coherence Techniques V
Rainer A. Leitgeb; Brett E. Bouma, Editor(s)

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