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Proceedings Paper

Swept-source coherence-gated Shack-Hartmann wavefront sensor
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Paper Abstract

In this report we investigate the possibility of narrowing the depth range of a physical Shack-Hartmann wavefront sensor (SH-WFS) using coherence gating technique in spectral domain. A time-domain low coherence interferometry (LCI) setup [1] has already been demonstrated capable of generating similar Shack-Hartmann spots pattern to that delivered by a conventional SH-WFS. Stray reflections are eliminated in the images due to a narrow coherence gating introduced by the interferometric technique. Hereby we present another approach by employing a wavelength tuneable light source to obtain Shack-Hartmann spot patterns with coherence gating in a 3D volume without axial scanning. Signal strength is enhanced in contrast with a conventional SH-WFS and signal to noise ratio is improved compared to the previous time-domain setup. This novel technique has the potential of providing depth resolved wavefront aberration information, which can guide better wavefront correction in adaptive optics assisted ophthalmology imaging and confocal microscopy instruments.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8213, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, 82132J (30 January 2012); doi: 10.1117/12.908920
Show Author Affiliations
Jingyu Wang, Univ. of Kent (United Kingdom)
Adrian Gh. Podoleanu, Univ. of Kent (United Kingdom)

Published in SPIE Proceedings Vol. 8213:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI
Joseph A. Izatt; James G. Fujimoto; Valery V. Tuchin, Editor(s)

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