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Ptychographic coherent diffractive imaging with orthogonal probe relaxation

Ptychographic coherent diffractive imaging with orthogonal probe relaxation
Ptychographic coherent diffractive imaging with orthogonal probe relaxation
Ptychography is a scanning coherent diffractive imaging (CDI) technique that relies upon a high level of stability of the illumination during the course of an experiment. This is particularly an issue for coherent short wavelength sources, where the beam intensity is usually tightly focused on the sample in order to maximize the photon flux density on the illuminated region of the sample and thus a small change in the beam position results in a significant change in illumination of the sample. We present an improved ptychographic method that allows for limited stability of the illumination wavefront and thus significantly improve the reconstruction quality without additional prior knowledge. We have tested our reconstruction method in a proof of concept experiment, where the beam instability of a visible light source was emulated using a piezo driven mirror, and also in a short wavelength microscopy CDI setup using a high harmonic generation source in the extreme ultraviolet range. Our work shows a natural extension of the ptychography method that paves the way to use ptychographic imaging with any limited pointing stability coherent source such as free electron or soft X-ray lasers and improve reconstruction quality of long duration synchrotron experiments.
1094-4087
8360-8369
Odstrčil, Michal
b297d3ec-ed42-4709-9f90-7af79d0644c7
Baksh, Peter
578fea83-9a1c-4dd0-b3f6-66f5552f2344
Boden, Stuart
83976b65-e90f-42d1-9a01-fe9cfc571bf8
Card, Rachel
bf5e3360-b428-4c1a-b79e-4cc50649e5bc
Chad, John
d220e55e-3c13-4d1d-ae9a-1cfae8ccfbe1
Frey, Jeremy
ba60c559-c4af-44f1-87e6-ce69819bf23f
Brocklesby, William
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Odstrčil, Michal
b297d3ec-ed42-4709-9f90-7af79d0644c7
Baksh, Peter
578fea83-9a1c-4dd0-b3f6-66f5552f2344
Boden, Stuart
83976b65-e90f-42d1-9a01-fe9cfc571bf8
Card, Rachel
bf5e3360-b428-4c1a-b79e-4cc50649e5bc
Chad, John
d220e55e-3c13-4d1d-ae9a-1cfae8ccfbe1
Frey, Jeremy
ba60c559-c4af-44f1-87e6-ce69819bf23f
Brocklesby, William
c53ca2f6-db65-4e19-ad00-eebeb2e6de67

Odstrčil, Michal, Baksh, Peter, Boden, Stuart, Card, Rachel, Chad, John, Frey, Jeremy and Brocklesby, William (2016) Ptychographic coherent diffractive imaging with orthogonal probe relaxation. Optics Express, 24 (8), 8360-8369. (doi:10.1364/OE.24.008360).

Record type: Article

Abstract

Ptychography is a scanning coherent diffractive imaging (CDI) technique that relies upon a high level of stability of the illumination during the course of an experiment. This is particularly an issue for coherent short wavelength sources, where the beam intensity is usually tightly focused on the sample in order to maximize the photon flux density on the illuminated region of the sample and thus a small change in the beam position results in a significant change in illumination of the sample. We present an improved ptychographic method that allows for limited stability of the illumination wavefront and thus significantly improve the reconstruction quality without additional prior knowledge. We have tested our reconstruction method in a proof of concept experiment, where the beam instability of a visible light source was emulated using a piezo driven mirror, and also in a short wavelength microscopy CDI setup using a high harmonic generation source in the extreme ultraviolet range. Our work shows a natural extension of the ptychography method that paves the way to use ptychographic imaging with any limited pointing stability coherent source such as free electron or soft X-ray lasers and improve reconstruction quality of long duration synchrotron experiments.

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Submitted date: February 2016
Accepted/In Press date: 10 March 2016
e-pub ahead of print date: 8 April 2016
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 389575
URI: https://eprints.soton.ac.uk/id/eprint/389575
ISSN: 1094-4087
PURE UUID: a84fd2c8-2ffd-497e-ba3c-7dc30e0adbd1
ORCID for Stuart Boden: ORCID iD orcid.org/0000-0002-4232-1828
ORCID for John Chad: ORCID iD orcid.org/0000-0001-6442-4281
ORCID for Jeremy Frey: ORCID iD orcid.org/0000-0003-0842-4302
ORCID for William Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712

Catalogue record

Date deposited: 22 Mar 2016 09:38
Last modified: 09 Oct 2018 04:02

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Contributors

Author: Michal Odstrčil
Author: Peter Baksh
Author: Stuart Boden ORCID iD
Author: Rachel Card
Author: John Chad ORCID iD
Author: Jeremy Frey ORCID iD

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