Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier

Nik Krstajic, David Childs, Negin Peyvast, Deepa Kasaragod, Stephen J. Matcher, Igor Krestnikov, Richard Hogg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationOptical Coherence Tomography and Coherence Techniques V
Volume8091
DOIs
Publication statusPublished - 1 Aug 2011
EventOptical Coherence Tomography and Coherence Techniques V - Munich, Germany
Duration: 24 May 201126 May 2011

Conference

ConferenceOptical Coherence Tomography and Coherence Techniques V
CountryGermany
CityMunich
Period24/05/1126/05/11

Keywords

  • OCT
  • quantum dot
  • skin
  • SOA
  • swept-laser

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    Krstajic, N., Childs, D., Peyvast, N., Kasaragod, D., Matcher, S. J., Krestnikov, I., & Hogg, R. (2011). Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier. In Optical Coherence Tomography and Coherence Techniques V (Vol. 8091). [80911S] https://doi.org/10.1117/12.889247