TECHNICAL PAPERS: Microscale Heat Transfer

Determination of Kinetic Energy Distribution in a Laser-Ablated Titanium Plume by Emission and Laser-Induced Fluorescence Spectroscopy

[+] Author and Article Information
S. S. Chu, C. P. Grigoropoulos

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

J. Heat Transfer 122(4), 771-775 (Jun 02, 2000) (5 pages) doi:10.1115/1.1318214 History: Received November 11, 1999; Revised June 02, 2000
Copyright © 2000 by ASME
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TOF data acquired from emission imaging, LIF imaging, and PMT measurements. The velocities derived from LIF are consistent with the PMT data of neutral titanium (399.860 nm).
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Normalized pseudocolor PLIF images at λfluorescence=296.355 nm juxtaposed to emission images. The bright streaks in the PLIF images are reflections off the titanium target surface. The vacuum chamber is back filled with Ar at 100 mTorr. ϕ=3 J/cm2.
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Temporally resolved emission images of laser ablated titanium plume. Images are shown in normalized pseudocolor according to intensity.
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Effects of background Ar pressure on the most-probable centerline velocity of neutral titanium atoms in the plume. ϕ=7 J/cm2. The velocities shown are average values over the measurement range.
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Effects of laser fluence on the most probable centerline velocity of neutral titanium atoms in an expanding plume in vacuum. The velocities shown are average values over the measurement range.
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Two representative TOF signals of neutral titanium. The signals for 375.286 nm and 399.864 nm are in excellent agreement.
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Schematic of excitation laser setup. The output from the Nd:YAG laser contains both the fundamental (1064 nm) and doubled harmonic (532 nm). The fundamental portion is disposed in the beam separation package, and the remainder second harmonic is used to pump the dye laser. The vacuum chamber in which the titanium sample resides is omitted from this diagram.
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Experimental setups for imaging plume emission and capturing emission lines




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