Depth-Resolved Wavefront Aberrations using a Coherence-Gated Shack-Hartmann Wavefront Sensor

Tuohy, Simon and Podoleanu, Adrian G.H. (2010) Depth-Resolved Wavefront Aberrations using a Coherence-Gated Shack-Hartmann Wavefront Sensor. Optics Express, 18 (4). pp. 3458-3476. ISSN 1094-4087. (Full text available)

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In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann (SH) wavefront sensor (WFS) by using coherence gating. For the coherence gating, two low coherence interferometry (LCI) methods are evaluated and proof of principle configurations demonstrated: (i) a time domain LCI method based on phase shifting interferometry and (ii) a spectral domain LCI method, based on tuning a narrow band optical source. The two configurations are used to demonstrate each, the possibility of constructing a coherence gated (CG) SH/WFS. It is shown that these configurations produce spot patterns similar to those provided by a conventional SH/WFS. The two proof of principle configurations are also used to illustrate elimination of stray reflections in the interface optics which normally disturb the operation of conventional SH/WFSs. The speed and noise performance of the two CG-SH/WFS implementations are discussed.

Item Type: Article
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Uncontrolled keywords: Ophthalmology; Optical coherence tomography; Medical optics instrumentation; Adaptive Optics; Microscopy
Subjects: R Medicine > RE Ophthalmology
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Applied Optics Group
Depositing User: Tina Thompson
Date Deposited: 20 Aug 2012 09:41
Last Modified: 21 Aug 2015 11:50
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