About the correlation between the centre and the wings of a hard-apertured Gaussian beam

The paper considers the influence of near-field clipping upon the accuracy of angular divergence measurement of a laser beam. We have shown that power fraction that contain the centre and the wings of a diffracted beam are not necessarily correlated. This effect can lead to systematic important erro...

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Bibliographic Details
Published in:Optics communications 2009-10, Vol.282 (19), p.3854-3858
Main Authors: Traı¨che, Mohamed, Fromager, Michael, Cagniot, Emmanuel, Ait-Ameur, Kamel
Format: Article
Language:English
Subjects:
Beam characteristics: profile, intensity, and power
spatial pattern formation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser optical systems: design and operation
Optics
Physics
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Summary:The paper considers the influence of near-field clipping upon the accuracy of angular divergence measurement of a laser beam. We have shown that power fraction that contain the centre and the wings of a diffracted beam are not necessarily correlated. This effect can lead to systematic important errors on laser beam divergence measurement even when the beam under consideration is weakly truncated. In particular, the monitoring of any variable lensing effect can be greatly affected by such effects since one could be mistaken about its sign (converging or diverging).
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2009.06.045