Depth-resolved wavefront aberrations using a coherence-gated Shack-Hartmann wavefront sensor - PubMed (original) (raw)

. 2010 Feb 15;18(4):3458-76.

doi: 10.1364/OE.18.003458.

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Depth-resolved wavefront aberrations using a coherence-gated Shack-Hartmann wavefront sensor

Simon Tuohy et al. Opt Express. 2010.

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Abstract

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.

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