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TECHNICAL PAPERS

Characterization of Laser Cleaning of Copper for Soldering Processes

[+] Author and Article Information
J. M. Lee, K. G. Watkins, W. M. Steen

Laser Group, Department of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UK

J. Manuf. Sci. Eng 123(3), 521-527 (Jan 01, 2000) (7 pages) doi:10.1115/1.1344897 History: Received June 01, 1999; Revised January 01, 2000
Copyright © 2001 by ASME
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References

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Figures

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Soldering features with and without cleaning the surface: (a) without cleaning (b) with cleaning
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Reflectance spectrum for oxidized surface and clean surface
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Schematic diagram of (a) one dimensional surface heating model and (b) laser pulse shape
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Contours of constant temperature for Eq. (2) on the surface at the time of 10 nsec
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Laser craters on an oxidized copper surface with the sequence of the number of laser pulses with 1064 nm wavelength: (a) laser fluence=3.5 J/cm (b) laser fluence=6.9 J/cm2
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Acoustic waves emitted from an oxidized copper substrate under laser irradiation form (a) the first to (d) the fourth pulse respectively in the laser fluence of 3.5 J/cm2
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Acoustic emission intensity as a function of the number of laser pulses in the laser cleaning of an oxidized copper surface and a clean (nonoxidized) copper surface in the laser fluence of 3.5 J/cm2
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Acoustic emission intensity as a function of the number of laser pulses in the fluences of 3.5 J/cm2 and 6.9 J/cm2
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Acoustic emission intensity as a function of laser fluence in the laser cleaning of an oxidized copper surface and a clean copper surface
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Laser craters on an oxidized copper surface with the sequence of the number of laser pulses with different wavelengths. (a) 1064 nm (fluence=4.5 J/cm2) (b) 532 nm (fluence=4.4 J/cm2)
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Magnified laser craters on the black ink over-coated surface produced by the irradiation of the fifth laser pulse at 532 nm (left crater) and 1064 nm (right crater)
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Comparison between the experimental threshold laser fluence and the theoretical threshold fluence for copper oxide evaporation at the two wavelengths
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The intensity of the acoustic shock waves as a function of the number of laser pulses at the two wavelengths (1064 nm and 532 nm) in the laser fluence of 3.5 J/cm2

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