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Investigation of Femtosecond Laser Irradiation on Fused Silica Etching Selectivity

Published online by Cambridge University Press:  01 February 2011

Yves Bellouard ,
Ali A. Said ,
Mark Dugan  and
Philippe Bado
Yves Bellouard
Affiliation:
CAT/CIE, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180–3590, U.S.A.
Ali A. Said
Affiliation:
Translume Inc., 655 Phoenix Drive, Ann Arbor, MI 48108–2222, U.S.A.
Mark Dugan
Affiliation:
Translume Inc., 655 Phoenix Drive, Ann Arbor, MI 48108–2222, U.S.A.
Philippe Bado
Affiliation:
Translume Inc., 655 Phoenix Drive, Ann Arbor, MI 48108–2222, U.S.A.
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Abstract

Femtosecond laser irradiation has various noticeable effects on fused silica. It can locally increase the index of refraction or modify the material chemical selectivity. Regions that have been exposed to the laser are etched several times faster than unexposed regions. Various observations reported in the literature seem to show that these effects are possibly related to a combination of structural changes and the presence of internal stress. However, a detailed analysis of the contribution of both effects is still lacking.

In this paper, we present systematic SEM-based investigations performed on fused silica (a-SiO2). Line-patterns were first scanned on the substrate using a femtosecond laser and then etched in a low-concentration HF solution. The effects of various laser parameters like power and scanning speed are analyzed and we show further evidence of an interface between two different etching regimes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 850: Symposium MM – Ultrafast Lasers for Materials Science , 2004 , MM5.1
Copyright
Copyright © Materials Research Society 2005

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References

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