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Cutting Reactive Foils Without Igniting Them (A Femtosecond Laser Machining Approach)

Published online by Cambridge University Press:  01 February 2011

Yoosuf N. Picard ,
Hsiao-Hua Liu ,
Stephen J. Speys ,
Joel P. McDonald ,
David P. Adams ,
Timothy P. Weihs  and
Steven M. Yalisove
Yoosuf N. Picard
Affiliation:
Dept. of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2176, U.S.A. Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109–2099, U.S.A.
Hsiao-Hua Liu
Affiliation:
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109–2099, U.S.A.
Stephen J. Speys
Affiliation:
Dept. of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218–2686, U.S.A.
Joel P. McDonald
Affiliation:
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109–2099, U.S.A. Applied Physics Program, University of Michigan, Ann Arbor, MI 48109–1120, U.S.A.
David P. Adams
Affiliation:
Advanced Manufacturing Processes Lab, Sandia National Laboratories, Albuquerque, NM 87185–0959, U.S.A.
Timothy P. Weihs
Affiliation:
Dept. of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218–2686, U.S.A.
Steven M. Yalisove
Affiliation:
Dept. of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2176, U.S.A. Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109–2099, U.S.A.
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Abstract

Ni/Al nanostructured multilayer foils were machined with femtosecond pulse-length laser irradiation at various fluences. Scanning electron microscopy, back-scattered electron detection, and atomic force microscopy were used to characterize the resulting laser modified regions. We show that material removal at the micron scale is possible with no ignition of a self-propagation reaction emanating from the irradiated areas, a danger minimized by the fact that the extremely short time duration of the pulse produces negligible heat dissipation into the multilayer system. Nevertheless, initial AFM and BSE results give indication that multilayers may be intermixing and reacting locally in areas smaller than the laser beam diameter, though the exact ignition mechanism is still to be determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 800: Symposium AA – Synthesis, Characterization, and Properties of Energetic/Reactive Nanomaterials , 2003 , AA9.8
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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