Transverse correlation vanishing due to phase aberrations |
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Authors: | Thomas Godin Darryl Naidoo Emmanuel Cagniot |
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Affiliation: | a Centre de Recherche sur les Ions, les Matériaux et la Photonique, ENSICAEN, 6 Bd. Maréchal Juin, F14050 Caen, Franceb CSIR National Laser Centre, PO Box 395, Pretoria 0001, South Africa |
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Abstract: | The concept of transverse correlation vanishing, between the fraction of power contained in the centre and wings of a probe beam, recently introduced [Opt. Commun. 282 (2009) 3854-3858] is important to be considered when measuring the effective focal length of any refractive index profile. When the latter is not parabolic it is shown that the transverse correlation could vanish, and this represents a potential source of error when measuring any lensing effect. We propose a low cost set-up (two photodiodes, a pinhole and a stop) able to reveal if the probe beam has monitored a pure or an aberrated lensing effect especially when it is time-dependent. |
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Keywords: | Diffraction Phase aberration Lensing effect Beam divergence Transverse correlation |
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