Length measurement of the eye using a swept-source interferometer

Haroun Al-Mohamedi; Andreas Prinz; Guido Mieskes; Theo Oltrup; Thomas Bende

doi:10.1515/bmt-2013-0022

Article

Length measurement of the eye using a swept-source interferometer

Haroun Al-Mohamedi , Andreas Prinz , Guido Mieskes , Theo Oltrup and Thomas Bende

Published/Copyright: October 4, 2013

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From the journal Biomedizinische Technik/Biomedical Engineering Volume 59 Issue 1

Abstract

In this article, a swept-source setup based on a semiconductor optical amplifier at the central wavelength of 1050 nm for measurements of the axial length inside the eye is presented. The large coherence length is achieved using a tunable optical filter, consisting of a reflective diffraction grating, two Littrow prisms, and a scanner. It was possible to achieve a coherence length of 40 mm, which allowed interference measurements in this range to be made. Measurements of the biomedical data of a human model eye are presented. To realize faster measurements, the data acquisition must be increased to more than 2 MS/s. In further studies, the usage of a field-programmable gate array, to achieve faster measurements, will be considered.

Keywords: axial resolution; coherence length; measuring depth; model eye; quasi-constant phase

Corresponding author: Haroun Al-Mohamedi, Stiftungslabor für Grundlagenforschung, Universitäts-Augenklinik Tübingen, D-72074 Tuebingen, Deutschland, Germany, Phone: +49-7071-9755061, Fax: +49-7071-9755066, E-mail: alharoun@deos-tuebingen.de

The funds for this work were provided by the Dr. Ernst and Wilma Mueller Foundation and the Henning Zuegel Foundation. At this point, we would like to thank them for their support.

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Received: 2013-2-11

Accepted: 2013-8-30

Published Online: 2013-10-04

Published in Print: 2014-02-01

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Articles in the same Issue

https://doi.org/10.1515/bmt-2013-0022

Keywords for this article

axial resolution; coherence length; measuring depth; model eye; quasi-constant phase