Evaluation of a cheap ultrasonic stage for light source coherence function measurement, optical coherence tomography and dynamic focusing

Nikola Krstajić, Stephen J. Matcher, David Childs, Wiendelt Steenbergen, Richard Hogg, Rod Smallwood

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We evaluate the performance of a cheap ultrasonic stage in setups related to optical coherence tomography. The stage was used in several configurations: (1) optical delay line in an optical coherence tomography (OCT) setup; (2) as a delay line measuring coherence function of a low coherence source (e.g. superluminescent diode) and (3) in a dynamic focusing arrangement. The results are as follows: the stage is suitable for coherence function measurement (coherence length up to 70 νm) of the light source and dynamic focusing. We found it unsuitable for OCT due to an unstable velocity profile. Despite this, the velocity profile has a repeatable shape (4% over 1000 A-scans) and slight modifications to the stage promise wider applications.

    Original languageEnglish
    Article number107002
    JournalMeasurement Science and Technology
    Volume20
    Issue number10
    Early online date16 Sep 2009
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Coherence function
    • Dynamic focusing
    • Optical coherence tomography
    • Optical delay line
    • Ultrasonic stage

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