TECHNICAL PAPERS: Microscale Heat Transfer

Melting and Surface Deformation in Pulsed Laser Surface Micromodification of Ni-P Disks

[+] Author and Article Information
S. C. Chen

Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740

D. G. Cahill

Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801

C. P. Grigoropoulos

Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740cgrigoro@me.berkeley.edu

J. Heat Transfer 122(1), 107-112 (Sep 01, 1999) (6 pages) doi:10.1115/1.521441 History: Received March 29, 1999; Revised September 01, 1999
Copyright © 2000 by ASME
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Experimental setup of the laser surface modification of Ni-P disk substrates
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Typical features (measured by AFM) produced by laser heating at (a) high laser energy, (b) intermediate laser energy
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Bump shape (cross section, measured by AFM) variation due to the incident heating beam energy change
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Experimental setup of the photothermal displacement method (AT) attenuator, (BE) beam expander, (BS) beam splitter, (DE) detector, (F) filter, (KE) knife-edge, (L) lens, (WP) quarter wave plate
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Transient deflection signals at various heating laser energies. The deflection signal is enhanced due to the crater formation, and weakened for the Sombrero case
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Experimental setup of the laser flash photography system (BA) beam attenuator, (BE) beam expander, (BS) beam splitter, (LWD) long-working distance microscope, (L) lens
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A sequence of images of bumps with laser pulse energy of (a) 4.0 μJ and (b) 2.0 μJ produced by the laser flash photography system
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Experimental setup of the green laser texturing and the laser flash deflection microscope: (AT) attenuator, (BS) beam splitter, (F) filter, (KE) knife-edge, (L) lens, (M) mirror, (MS) microscope
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Laser energy dependence of bump shape (cross section, measured by AFM) in green laser texturing
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A sequence of images of bumps with green laser pulse energy of (a) 0.13 μJ (V type), (b) 0.17 μJ (sombrero type), and (c) 0.27 μJ (double-rim type) produced by a laser flash deflection microscope



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