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Proceedings Paper

Collimation testing based on self-imaging
Author(s): Roberto Daniel Torroba; Nestor A. Bolognini; Myrian C. Tebaldi; Alberto A. Tagliaferri
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Paper Abstract

It is proposed a technique to test the collimation status of a beam. The testing combines a moire beating technique with a digital technique. A self-image of the grating produced by a collimated beam is stored in the memory of the frame grabber. When a decollimation of the laser beam exists, the self-image period is modified. The digital subtraction between both self-image gratings produce a beating pattern. The beating moire fringe spacing is related to the decollimation degree of the illuminating beam. The validity of the technique is verified experimentally by using lenses of various focal lengths.

Paper Details

Date Published: 14 August 2001
PDF: 4 pages
Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); doi: 10.1117/12.437235
Show Author Affiliations
Roberto Daniel Torroba, Ctr. de Investigationes Opticas and Univ. Nacional de La Plata (Argentina)
Nestor A. Bolognini, Ctr. de Investigaciones Opticas and Univ. Nacional de La Plata (Argentina)
Myrian C. Tebaldi, Ctr. de Investigaciones Opticas and Univ. Nacional de La Plata (Argentina)
Alberto A. Tagliaferri, Univ. do Estado do Rio de Janeiro (Brazil)


Published in SPIE Proceedings Vol. 4419:
4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications

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