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Permanent link (DOI): https://doi.org/10.7939/R3FS4B

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Femtosecond laser based x-ray sources and their applications in phase contrast imaging Open Access

Descriptions

Other title
Subject/Keyword
Laser plasma interaction, x-rays, phase contrast imaging
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Ali, Atif
Supervisor and department
Robert Fedosejevs (Electrical and Computer Engineering)
Examining committee member and department
Wojciech Rozmus (Physics)
Ying Tsui (Electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2010-04-01T21:20:27Z
Graduation date
2010-06
Degree
Master of Science
Degree level
Master's
Abstract
The focus of this dissertation is to study the keV X-ray emission from different Z material to develop compact, quasi-continuous tabletop Kα sources for the application of in-line phase contrast imaging, X-ray diffraction experiments and X-ray microscopy. The emission occurs from plasma produced by focusing 120 fs, 800 nm and 300 μJ Ti:Sapphire laser pulses up to an intensity of few times 1016 W/cm2 on Cu, Fe and Ag metal targets. The main interest of these experiments is to characterize the fast electrons and X-ray emission from the laser plasma interaction. The investigation of X-ray emission energy and spectral characteristics is carried out by employing three detector systems which include filtered pin-diode, Charge Coupled Device and CdTe pulse height detectors. Scaling of photon flux as a function of incident laser energy is measured and related to the dynamics and absorption mechanisms involved in laser matter interaction. Specifically the construction and evaluation of Kα X-ray sources operated at 1 kHz repetition rate is reported with a photon flux of ~ 7×109 photon/s, 3×109 photon/s and 1.4×107 photon/s around the Kα line for Cu, Fe and Ag respectively. These Kα fluences correspond to energy conversion efficiencies of around ηCu = 3×10-5, ηFe = 1.06×10-5 and ηAg = 2×10-7. The Cu and Fe Kα X-ray sources are applied to thin biological specimens and low atomic number (Z) materials to record in-line phase contrast images. It is demonstrated that the laser based Kα sources can serve as alternative sources for conventional X-ray radiography of biological samples in clinical applications.
Language
English
DOI
doi:10.7939/R3FS4B
Rights
License granted by atif ali (atif1@ualberta.ca) on 2010-04-01 (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Chapter 1 Introduction
File title: Introduction
File author: atif
Page count: 139
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