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- W1553156922 abstract "This thesis analyzes the influence of a self-inducednatural convection flow on the propagation of a high energy laserbeam. The two configurations considered are of a vertical laserbeam (propagation direction opposite to gravity) and a horizontallaser beam (gravity acting in a direction perpendicular topropagation) traveling through an infinite expanse of quiescentfluid. Hamiltonian optics is used to predict the evolution of raysat steady state. The change in refractive index due to localizedheating of the fluid by the laser is measured using interferometry.For the vertical laser beam, one model considers the beam to be alinear energy source. Another model considers the spatial intensitydistribution of the beam as a generation term in the energyconservation equation. Simulation for both the models predict theformation of a caustic, as the beam propagates through the medium.Due to radial symmetry, there is a dense packing of rays along theperiphery of a circle. Here, this formation is referred to as thethermal ring. The horizontal laser beam is first modeled as alinear source of uniform strength along the propagation path. Thechange in temperature is calculated using a similarity solution,and the resulting refractive index change predicts the raybehavior. Here again, formation of a caustic is suggested, with ahigh density of the rays at two locations above the beam centre.Modeling of the laser as a decaying line source also predicts thedensing of rays. The thermal lensing caused by a horizontal 120mWlaser in a 1% aqueous Toluidine Blue sample is visualized using aMach-Zehnder interferometer. The interferograms are analyzed usingboth the Fourier methods and phase shifting. Both predict thechange in refractive index near the beam to be of the same order ofmagnitude as the simulation results." @default.
- W1553156922 created "2016-06-24" @default.
- W1553156922 creator A5038316414 @default.
- W1553156922 date "2010-01-01" @default.
- W1553156922 modified "2023-09-23" @default.
- W1553156922 title "Influence of Induced natural convection on laser propagation : analysis and interferometric visualization" @default.
- W1553156922 hasPublicationYear "2010" @default.
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