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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26099–26109

Correlation matching method for high-precision position detection of optical vortex using Shack–Hartmann wavefront sensor

Chenxi Huang, Hongxin Huang, Haruyoshi Toyoda, Takashi Inoue, and Huafeng Liu  »View Author Affiliations


Optics Express, Vol. 20, Issue 24, pp. 26099-26109 (2012)
http://dx.doi.org/10.1364/OE.20.026099


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Abstract

We propose a new method for realizing high-spatial-resolution detection of singularity points in optical vortex beams. The method uses a Shack–Hartmann wavefront sensor (SHWS) to record a Hartmanngram. A map of evaluation values related to phase slope is then calculated from the Hartmanngram. The position of an optical vortex is determined by comparing the map with reference maps that are calculated from numerically created spiral phases having various positions. Optical experiments were carried out to verify the method. We displayed various spiral phase distribution patterns on a phase-only spatial light modulator and measured the resulting singularity point using the proposed method. The results showed good linearity in detecting the position of singularity points. The RMS error of the measured position of the singularity point was approximately 0.056, in units normalized to the lens size of the lenslet array used in the SHWS.

© 2012 OSA

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(230.6120) Optical devices : Spatial light modulators
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 13, 2012
Revised Manuscript: October 26, 2012
Manuscript Accepted: October 27, 2012
Published: November 5, 2012

Citation
Chenxi Huang, Hongxin Huang, Haruyoshi Toyoda, Takashi Inoue, and Huafeng Liu, "Correlation matching method for high-precision position detection of optical vortex using Shack–Hartmann wavefront sensor," Opt. Express 20, 26099-26109 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26099


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