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Heat Transfer Research

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ISSN Print: 1064-2285
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015012439
pages 861-879

ULTRAFAST LASER PULSE TRAIN RADIATION TRANSFER IN A SCATTERING-ABSORBING 3D MEDIUM WITH AN INHOMOGENEITY

Masato Akamatsu
Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
Zhixiong Guo
Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA

ABSTRACT

In this study, we continue investigating the ultrafast laser pulse train irradiation of inhomogeneous media, focusing on different degrees of inhomogeneity in a base scattering-absorbing medium. We used the transient discrete-ordinates method to acquire basic solutions of radiation transfer in the 3D inhomogeneous media subjected to a unit step pulse and then adopted the Duhamel's superposition theorem to construct series solutions subjected to a pulse of different pulse widths or a pulse train consisting of many such pulses. The effects of scattering albedo, inhomogeneity size and location, pulse width and interval, and detector position on the temporal reflectance and transmittance signals are characterized and revealed.