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RESEARCH PAPERS: Heat Transfer in Manufacturing

Improved Two-Temperature Model and Its Application in Ultrashort Laser Heating of Metal Films

[+] Author and Article Information
Lan Jiang

Laser-Based Manufacturing Laboratory, Department of Mechanical and Aerospace Engineering,  University of Missouri-Rolla, Rolla, MO 65409

Hai-Lung Tsai1

Laser-Based Manufacturing Laboratory, Department of Mechanical and Aerospace Engineering,  University of Missouri-Rolla, Rolla, MO 65409

1

Corresponding author; e-mail address: tsai@umr.edu

J. Heat Transfer 127(10), 1167-1173 (Jun 07, 2005) (7 pages) doi:10.1115/1.2035113 History: Received September 21, 2004; Revised June 07, 2005

The two-temperature model has been widely used to predict the electron and phonon temperature distributions in ultrashort laser processing of metals. However, estimations of some important thermal and optical properties in the existing two-temperature model are limited to low laser fluences in which the electron temperatures are much lower than the Fermi temperature. This paper extends the existing two-temperature model to high electron temperatures by using full-run quantum treatments to calculate the significantly varying properties, including the electron heat capacity, electron relaxation time, electron conductivity, reflectivity, and absorption coefficient. The proposed model predicts the damage thresholds more accurately than the existing model for gold films when compared with published experimental results.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

The differences between different treatments for gold: (a) average free electron kinetic energy in electronvolts and (b) molar free electron specific heat

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Figure 2

Molar phonon specific heat predicted by different approaches

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Figure 3

Distribution of occupied electronic states near the Fermi energy: (a) electronic occupy and (b) change in electronic occupancy

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Figure 4

(a) electron temperature distribution and (b) lattice temperature distribution at different times predicted by the proposed model for a 200 nm gold film irradiated by a 140 fs, 1053 nm pulse at 0.45J∕cm2

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Figure 5

Surface temperature as a function of time for 200 nm gold film irradiated by a 140 fs, 1053 nm pulse at 0.05J∕cm2: (a) the existing model and (b) the proposed model

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Figure 6

Surface temperature as a function of time for 200 nm gold film irradiated by a 140 fs, 1053 nm pulse at 0.2J∕cm2: (a) the existing model (b) the proposed model

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Figure 7

Damage threshold fluences of 200 nm gold film processed by a 1053 nm laser at different pulse durations

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