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Full characterisation of a focussed extreme ultraviolet beam using a non-redundant array of apertures

Full characterisation of a focussed extreme ultraviolet beam using a non-redundant array of apertures
Full characterisation of a focussed extreme ultraviolet beam using a non-redundant array of apertures
This paper presents a novel technique for characterising wavefront curvature and M2, by utilising a non-redundant array (NRA) of apertures to define the plane of investigation through an experimental extreme ultraviolet (EUV) focus. Appropriately sampled, far-field EUV scattering from this NRA is captured on a CCD as the NRA is scanned along the beam axis through the focus. By taking the inverse Fourier transform (IFT), it is possible obtain the spatial autocorrelation functions, via the Wiener-Khinchin theorem, of the exit wave field. By observing the position of the first-order peaks in the autocorrelation as a function of grid translation, both the real and imaginary parts of the complex beam parameter can be determined and the M2 calculated, yielding full characterisation of the embedded Gaussian. Since the periodicity of the grid is known, the planar pixel resolution can be calculated, also allowing the translations movement to be confirmed due to the change in angular acceptance of the fixed CCD. This makes the technique self-calibrating. A high impact, easy to use, cross field technique for full profiling of the embedded Gaussian of probe beams using a non-redundant array of apertures is presented. The technique is experimentally verified in the highly absorbing EUV spectral regime, and is expected to play a significant role in other regimes, where experimental issues prevent the use of existing techniques.
Parsons, A.D.
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Baksh, P.
578fea83-9a1c-4dd0-b3f6-66f5552f2344
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Chapman, R.T.
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Mills, B.
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Frey, J.G.
ba60c559-c4af-44f1-87e6-ce69819bf23f
Parsons, A.D.
4233ec59-883d-433b-ac17-6fd7a3fafa8b
Baksh, P.
578fea83-9a1c-4dd0-b3f6-66f5552f2344
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Chapman, R.T.
8a9fe0e2-c408-4188-bf10-e93bf247205c
Mills, B.
05f1886e-96ef-420f-b856-4115f4ab36d0
Frey, J.G.
ba60c559-c4af-44f1-87e6-ce69819bf23f

Parsons, A.D., Baksh, P., Brocklesby, W.S., Chapman, R.T., Mills, B. and Frey, J.G. (2013) Full characterisation of a focussed extreme ultraviolet beam using a non-redundant array of apertures. 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, Germany. 12 - 16 May 2013. 1 pp .

Record type: Conference or Workshop Item (Poster)

Abstract

This paper presents a novel technique for characterising wavefront curvature and M2, by utilising a non-redundant array (NRA) of apertures to define the plane of investigation through an experimental extreme ultraviolet (EUV) focus. Appropriately sampled, far-field EUV scattering from this NRA is captured on a CCD as the NRA is scanned along the beam axis through the focus. By taking the inverse Fourier transform (IFT), it is possible obtain the spatial autocorrelation functions, via the Wiener-Khinchin theorem, of the exit wave field. By observing the position of the first-order peaks in the autocorrelation as a function of grid translation, both the real and imaginary parts of the complex beam parameter can be determined and the M2 calculated, yielding full characterisation of the embedded Gaussian. Since the periodicity of the grid is known, the planar pixel resolution can be calculated, also allowing the translations movement to be confirmed due to the change in angular acceptance of the fixed CCD. This makes the technique self-calibrating. A high impact, easy to use, cross field technique for full profiling of the embedded Gaussian of probe beams using a non-redundant array of apertures is presented. The technique is experimentally verified in the highly absorbing EUV spectral regime, and is expected to play a significant role in other regimes, where experimental issues prevent the use of existing techniques.

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More information

e-pub ahead of print date: 2013
Additional Information: CH-P.11
Venue - Dates: 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, Germany, 2013-05-12 - 2013-05-16
Organisations: Optoelectronics Research Centre, Chemistry

Identifiers

Local EPrints ID: 366448
URI: http://eprints.soton.ac.uk/id/eprint/366448
PURE UUID: 8f9c4fbc-4593-48cb-bb6e-3230478602d3
ORCID for W.S. Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712
ORCID for B. Mills: ORCID iD orcid.org/0000-0002-1784-1012
ORCID for J.G. Frey: ORCID iD orcid.org/0000-0003-0842-4302

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Date deposited: 30 Jun 2014 11:24
Last modified: 18 Feb 2021 17:08

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Contributors

Author: A.D. Parsons
Author: P. Baksh
Author: W.S. Brocklesby ORCID iD
Author: R.T. Chapman
Author: B. Mills ORCID iD
Author: J.G. Frey ORCID iD

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