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Time-domain coherence-gated Shack-Hartmann wavefront sensor

Wang, Jingyu and Podoleanu, Adrian Gh. (2011) Time-domain coherence-gated Shack-Hartmann wavefront sensor. In: Optical Coherence Tomography and Coherence Techniques V. Proceedings of SPIE . SPIE. ISBN 978-0-8194-8688-2. (doi:10.1117/12.889567) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:49408)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
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In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann wavefront sensor (SH-WFS) by using coherence gating. We have already demonstrated a low coherence interferometry (LCI) set-up, capable of generating similar spots patterns as a conventional SH-WFS and also capable of eliminating stray reflections. Here, we evaluate the accuracy of wavefront measurements using a coherence-gated (CG)/SH-WFS. This is based on a Mach-Zehnder interferometer combined with a SH-WFS, that implements time-domain (TD)-LCI acquisition. The wavefront measurement errors introduced by the non-uniform distribution of the reference power over the photo-detector array were investigated. The effect on the centroid nodes accuracy due to different numbers of phaseshifting interferometry (PSI) steps applied was also evaluated. This novel technique has the potential of providing depth resolved aberration information, which can guide better correction in adaptive optics assisted OCT and confocal imaging instruments.

Item Type: Book section
DOI/Identification number: 10.1117/12.889567
Uncontrolled keywords: adaptive optics, coherence gating, low coherence interferometry, Mach-Zehnder interferometer, phase shifting interferometry, Shack-Hartman wavefront sensor, Confocal imaging, Depth range, Depth-resolved, Hartmann wave front sensors, Low coherence interferometry, Mach-Zehnder, Non-uniform distribution, Novel techniques, Phase shifting Interferometry, Shack-Hartman wavefront sensor, Shack-Hartmann wavefront sensors, Stray reflections, Time domain, Wavefront measurement, Electric appliances, Interferometry, Mach-Zehnder interferometers, Measurement errors, Optics, Phase shift, Sensors, Time domain analysis, Tomography, Wave interference, Wavefronts
Subjects: Q Science > QC Physics > QC355 Optics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Giles Tarver
Date Deposited: 16 Jul 2015 13:40 UTC
Last Modified: 16 Nov 2021 10:20 UTC
Resource URI: (The current URI for this page, for reference purposes)
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