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Proceedings Paper

Laser hole drilling process studied using laser speckle correlation
Author(s): Mikael Sjödahl; Per Gren; Istvan Sárady; Natalia Miroshnicova
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Paper Abstract

This paper revisits defocused speckle correlation as a tool for measuring the response in metal sheets during percussion laser drilling processing. For the processing the 4th harmonic Nd:YAG wavelength (266 nm) was used in pulsed mode. It is shown that the method provides a cost efficient and robust alternative to speckle interferometry for the study of the small deformations that appear during laser processing. The accuracy was shown to be in the order of a few tens of μrads for the tilt component being measured which translates to a few nm in deflection when being spatially integrated. In the measurements deflections up to 50 nm was detected on the backside of silver and a copper sheet, respectively.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63412M (15 September 2006); doi: 10.1117/12.695845
Show Author Affiliations
Mikael Sjödahl, Luleå Univ. of Technology (Sweden)
Per Gren, Luleå Univ. of Technology (Sweden)
Istvan Sárady, Luleå Univ. of Technology (Sweden)
Natalia Miroshnicova, Luleå Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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