Interaction of a Short-Pulse Laser of a Gaussian Temporal Profile with an Inhomogeneous Medium

Abstract

Transport of a short-pulse laser in an inhomogeneous planar participating medium is investigated. The pulse is a Gaussian function in time. Discrete as well as continuous variations in the scattering albedo across the layers are considered to be the cause of inhomogeneties in the absorbing-scattering medium. Optical depths of different layers too are considered different. The finite volume method is used to analyze the problem. Transmittance and reflectance signals are studied for different situations. Characteristic signals are obtained for specific inhomogeneties in the medium.

Analysis of the Transport of a Train of Short-Pulse Radiation of Gaussian Temporal Profile Through a 2-D Participating Medium

“…Most of them focused their analyses on a simple one-dimensional (1-D) planar geometry [14,18,22,[26][27][28][29][32][33][34]. Some have also solved problems in two-dimensional (2-D) [17,20,21] and three-dimensional (3-D) Cartesian geometries [24,30].…”

Comparison of the thermal effects of the transport of a short-pulse laser and a multi-pulse laser through a participating medium

“…1-D planar medium [11][12][13][14][15][16][17][18][19][20][21] as well as multi-dimensional [22][23][24][25][26][27][28][29][30] geometries, have been considered in the analysis. Cases of the incident radiation source having step [16,17,20,23] as well as Gaussian temporal profiles [11][12][13][14][15]18,19,21,22,[24][25][26][27][28][29][30] have been considered. Study has also been reported with diffuse as well as collimated radiation sources.…”

“…Study has also been reported with diffuse as well as collimated radiation sources. Different researchers have done the analysis using different numerical radiative transfer methods, viz., differential approximation [13], discrete ordinates method (DOM) [11,16,20,22,27,29], discrete transfer method (DTM) [16,18], finite element method [15], Monte Carlo method [24,26], radiation element method [14] and the finite volume method (FVM) [16,17,19,21,23].…”

Absorption of Short-Pulsed Laser Radiation in Superficial Human Tissues: Transient vs Quasi-Steady Radiative Transfer

“…The problem of a transient radiative transfer has been addressed in numerous investigations, especially in the last decade [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. However, only few of these studies were concerned with biomedical applications.…”