Soft-x-ray wavelength shift induced by ionization effects in a capillary
Soft-x-ray wavelength shift induced by ionization effects in a capillary
Coherent soft x rays are produced by high-harmonic generation in a capillary filled with Ar gas. We demonstrate that the tuning of the harmonic wavelengths with intensity and chirp arises from changes in the Ar ionization level. Control over the tuning can be achieved either by changing the average intensity of the laser pulse or by varying the quadratic spectral phase of the laser pulse. We observe an ionization-dependent blueshift of the fundamental wavelength that is directly imprinted on the harmonic wavelengths. The harmonic tuning is shown to depend on nonlinear spectral shifts of the fundamental laser pulse that are due to the plasma created by ionization, rather than directly on any chirp imposed on the fundamental wavelength.
374-376
Froud, C.A.
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Rogers, E.T.F.
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Hanna, D.C.
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Brocklesby, W.S.
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Praeger, M.
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de Paula, A.M.
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Baumberg, J.J.
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Frey, J.G.
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14 October 2006
Froud, C.A.
5462f6f5-3d1e-40e2-a362-d9e4d9ddd691
Rogers, E.T.F.
b92cc8ab-0d91-4b2e-b5c7-8a2f490a36a2
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Praeger, M.
84575f28-4530-4f89-9355-9c5b6acc6cac
de Paula, A.M.
834793cd-08ba-4c24-9d74-d8d4d8206867
Baumberg, J.J.
9eb85b3d-107f-466d-ac6e-2cfd03c9229a
Frey, J.G.
ba60c559-c4af-44f1-87e6-ce69819bf23f
Froud, C.A., Rogers, E.T.F., Hanna, D.C., Brocklesby, W.S., Praeger, M., de Paula, A.M., Baumberg, J.J. and Frey, J.G.
(2006)
Soft-x-ray wavelength shift induced by ionization effects in a capillary.
Optics Letters, 31 (3), .
(doi:10.1364/OL.31.000374).
Abstract
Coherent soft x rays are produced by high-harmonic generation in a capillary filled with Ar gas. We demonstrate that the tuning of the harmonic wavelengths with intensity and chirp arises from changes in the Ar ionization level. Control over the tuning can be achieved either by changing the average intensity of the laser pulse or by varying the quadratic spectral phase of the laser pulse. We observe an ionization-dependent blueshift of the fundamental wavelength that is directly imprinted on the harmonic wavelengths. The harmonic tuning is shown to depend on nonlinear spectral shifts of the fundamental laser pulse that are due to the plasma created by ionization, rather than directly on any chirp imposed on the fundamental wavelength.
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Published date: 14 October 2006
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Local EPrints ID: 57265
URI: http://eprints.soton.ac.uk/id/eprint/57265
ISSN: 0146-9592
PURE UUID: 28ef5f94-0053-4f3b-ac07-5251040c4220
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Date deposited: 13 Aug 2008
Last modified: 16 Mar 2024 03:59
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Author:
C.A. Froud
Author:
E.T.F. Rogers
Author:
D.C. Hanna
Author:
A.M. de Paula
Author:
J.J. Baumberg
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