Numerical and experimental aspect of coherent lensless imaging
(2021)- Abstract
- This thesis is devoted to the understanding, application, and extension of coherent lensless imaging methods for microscopy purposes. Particular attention is given to the Fourier transform holography and coherent diffractive imaging methods.These two methods share several properties such as the ability for singleshot imaging and their experimental geometries, but differ greatly in their reconstruction approach. Holographic approaches use reference waves to encode phase information into the measurements which means the reconstruction quality is controlled, to a large extent, by the characteristics of the reference wave. In contrast, coherent diffractive imaging utilizes prior knowledge to iteratively recover the phase information; this has... (More)
- This thesis is devoted to the understanding, application, and extension of coherent lensless imaging methods for microscopy purposes. Particular attention is given to the Fourier transform holography and coherent diffractive imaging methods.These two methods share several properties such as the ability for singleshot imaging and their experimental geometries, but differ greatly in their reconstruction approach. Holographic approaches use reference waves to encode phase information into the measurements which means the reconstruction quality is controlled, to a large extent, by the characteristics of the reference wave. In contrast, coherent diffractive imaging utilizes prior knowledge to iteratively recover the phase information; this has the effect that the reconstruction quality is independent of any optics or references, but relies heavily on the performance of iterative numerical algorithms. The complex nature of the phase retrieval problem raises questions regarding the existence and uniqueness of a solution which makes understanding the numerical and mathematical aspects of the problem of central importance.
The main topics in this thesis include: the extension of coherent diffractive imaging to multi-wavelength diffraction data, effects related to optically thick references in Fourier transform holography and an alternative numerical approach to phase retrieval which is based on non-rigid image registration. Along the way, various topics are covered which form the foundations of these techniques, or could be useful to a practioner in the field. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/74ab3c46-1535-47a1-916b-5ec11038646c
- author
- Malm, Erik LU
- supervisor
- opponent
-
- Staff/lead scientist Schlotter, William, SLAC National Accelerator Laboratory, Stanford University, USA
- organization
- publishing date
- 2021
- type
- Thesis
- publication status
- published
- subject
- keywords
- Coherent diffractive imaging, Holography, Phase retrieval, Diffraction, Inverse scattering, XUV light, non-rigid image registration, Fysicumarkivet A:2021:Malm
- pages
- 164 pages
- publisher
- Lund University
- defense location
- Rydbergsalen, Fysiska institutionen, Lund. Join via zoom: https://lu-se.zoom.us/j/67638823264 passcode 2020
- defense date
- 2021-05-26 09:15:00
- ISBN
- 9789178958733
- 9789178958740
- language
- English
- LU publication?
- yes
- id
- 74ab3c46-1535-47a1-916b-5ec11038646c
- date added to LUP
- 2021-04-27 14:34:47
- date last changed
- 2022-04-12 13:06:19
@phdthesis{74ab3c46-1535-47a1-916b-5ec11038646c,
abstract = {{This thesis is devoted to the understanding, application, and extension of coherent lensless imaging methods for microscopy purposes. Particular attention is given to the Fourier transform holography and coherent diffractive imaging methods.These two methods share several properties such as the ability for singleshot imaging and their experimental geometries, but differ greatly in their reconstruction approach. Holographic approaches use reference waves to encode phase information into the measurements which means the reconstruction quality is controlled, to a large extent, by the characteristics of the reference wave. In contrast, coherent diffractive imaging utilizes prior knowledge to iteratively recover the phase information; this has the effect that the reconstruction quality is independent of any optics or references, but relies heavily on the performance of iterative numerical algorithms. The complex nature of the phase retrieval problem raises questions regarding the existence and uniqueness of a solution which makes understanding the numerical and mathematical aspects of the problem of central importance.<br/> <br/>The main topics in this thesis include: the extension of coherent diffractive imaging to multi-wavelength diffraction data, effects related to optically thick references in Fourier transform holography and an alternative numerical approach to phase retrieval which is based on non-rigid image registration. Along the way, various topics are covered which form the foundations of these techniques, or could be useful to a practioner in the field.}},
author = {{Malm, Erik}},
isbn = {{9789178958733}},
keywords = {{Coherent diffractive imaging; Holography; Phase retrieval; Diffraction; Inverse scattering; XUV light; non-rigid image registration; Fysicumarkivet A:2021:Malm}},
language = {{eng}},
publisher = {{Lund University}},
school = {{Lund University}},
title = {{Numerical and experimental aspect of coherent lensless imaging}},
url = {{https://lup.lub.lu.se/search/files/97186307/e_nailing_thesis_malm.pdf}},
year = {{2021}},
}