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

Simon Tuohy1, Adrian Gh Podoleanu

  • 1Applied Optics Group, School of Physical Sciences, University of Kent, CT2 7NH Canterbury, UK. simontuohy@gmail.com

Optics Express
|April 15, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates coherence gating for Shack-Hartmann (SH) wavefront sensors (WFS) using low coherence interferometry (LCI). This technique narrows the depth range and eliminates stray reflections, improving SH/WFS performance.

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Area of Science:

  • Optical Metrology
  • Wavefront Sensing
  • Interferometry

Background:

  • Conventional Shack-Hartmann (SH) wavefront sensors (WFS) have limitations in depth range and are susceptible to stray reflections.
  • Low coherence interferometry (LCI) offers potential for depth discrimination in optical measurements.

Purpose of the Study:

  • To investigate the use of coherence gating with LCI techniques to narrow the depth range of SH/WFS.
  • To demonstrate proof-of-principle configurations for coherence-gated (CG) SH/WFS.
  • To evaluate the elimination of stray reflections in CG-SH/WFS systems.

Main Methods:

  • Two LCI methods were evaluated for coherence gating: time domain LCI with phase shifting and spectral domain LCI with a tunable source.
  • Proof-of-principle CG-SH/WFS configurations were built and tested.
  • Spot patterns and performance characteristics were analyzed.

Main Results:

  • Demonstrated the feasibility of constructing CG-SH/WFS using both LCI methods.
  • Observed spot patterns comparable to conventional SH/WFS.
  • Successfully illustrated the elimination of stray reflections impacting conventional SH/WFS operation.

Conclusions:

  • Coherence gating effectively narrows the depth range of SH/WFS.
  • CG-SH/WFS configurations show promise for improved performance by mitigating stray reflections.
  • Further discussion on speed and noise performance of the implemented CG-SH/WFS systems is provided.