Spatially resolved Ar* and Ar+* imaging as a diagnostic for capillary-based high harmonic generation
Spatially resolved Ar* and Ar+* imaging as a diagnostic for capillary-based high harmonic generation
Coherent x-ray - ultraviolet radiation can be generated by the highly nonlinear interaction between a gas target and high intensity ultrafast laser pulses using the high harmonic generation (HHG) process. Guiding the fundamental laser field inside a hollow capillary waveguide improves phase matching and extends the potential interaction length. However, the propagation of an intense pulse within a capillary waveguide filled with ionizable gas is complex, as the pulse creates a plasma, which in turn strongly affects the propagation. Previous work has used emission from the excited gas to study propagation of nanosecond pulses in capillary waveguides. In this work we demonstrate spectrally resolved imaging of the plasma created by intense femtosecond pulses within a capillary during an HHG experiment. The spectral and spatial resolution is used to separate contributions from ions and neutral species, and is an effective diagnostic for the local pressure and modal intensity variations along the waveguide.
high harmonic generation, capillary waveguide, mode beating
Froud, C.A.
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Chapman, R.T.
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Rogers, E.T.F.
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Praeger, M.
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Mills, B.
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Grant-Jacob, J.
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Butcher, T.J.
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Stebbings, S.L.
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de Paula, A.M.
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Frey, J.G.
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Brocklesby, W.S.
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2009
Froud, C.A.
516351fa-45f9-4566-aa2b-71776e7d5ede
Chapman, R.T.
8a9fe0e2-c408-4188-bf10-e93bf247205c
Rogers, E.T.F.
b92cc8ab-0d91-4b2e-b5c7-8a2f490a36a2
Praeger, M.
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Mills, B.
05f1886e-96ef-420f-b856-4115f4ab36d0
Grant-Jacob, J.
c5d144d8-3c43-4195-8e80-edd96bfda91b
Butcher, T.J.
bd3117c7-d50c-48d4-8038-76217b1c0570
Stebbings, S.L.
aa7b4db4-3297-485f-8caf-1c1c5951eae5
de Paula, A.M.
834793cd-08ba-4c24-9d74-d8d4d8206867
Frey, J.G.
ba60c559-c4af-44f1-87e6-ce69819bf23f
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Froud, C.A., Chapman, R.T., Rogers, E.T.F., Praeger, M., Mills, B., Grant-Jacob, J., Butcher, T.J., Stebbings, S.L., de Paula, A.M., Frey, J.G. and Brocklesby, W.S.
(2009)
Spatially resolved Ar* and Ar+* imaging as a diagnostic for capillary-based high harmonic generation.
Journal of Optics A: Pure and Applied Optics, 11 (5), [054011].
(doi:10.1088/1464-4258/11/5/054011).
Abstract
Coherent x-ray - ultraviolet radiation can be generated by the highly nonlinear interaction between a gas target and high intensity ultrafast laser pulses using the high harmonic generation (HHG) process. Guiding the fundamental laser field inside a hollow capillary waveguide improves phase matching and extends the potential interaction length. However, the propagation of an intense pulse within a capillary waveguide filled with ionizable gas is complex, as the pulse creates a plasma, which in turn strongly affects the propagation. Previous work has used emission from the excited gas to study propagation of nanosecond pulses in capillary waveguides. In this work we demonstrate spectrally resolved imaging of the plasma created by intense femtosecond pulses within a capillary during an HHG experiment. The spectral and spatial resolution is used to separate contributions from ions and neutral species, and is an effective diagnostic for the local pressure and modal intensity variations along the waveguide.
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Published date: 2009
Keywords:
high harmonic generation, capillary waveguide, mode beating
Organisations:
Chemistry, Optoelectronics Research Centre
Identifiers
Local EPrints ID: 70887
URI: http://eprints.soton.ac.uk/id/eprint/70887
ISSN: 1741-3567
PURE UUID: 6ac8ae48-d51e-43cb-9324-d988761fff73
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Date deposited: 24 Feb 2010
Last modified: 14 Mar 2024 02:56
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Contributors
Author:
C.A. Froud
Author:
R.T. Chapman
Author:
E.T.F. Rogers
Author:
M. Praeger
Author:
B. Mills
Author:
J. Grant-Jacob
Author:
T.J. Butcher
Author:
S.L. Stebbings
Author:
A.M. de Paula
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