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Soft-x-ray wavelength shift induced by ionization effects in a capillary

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.
0146-9592
374-376
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.
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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.
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), 374-376. (doi:10.1364/OL.31.000374).

Record type: Article

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

Identifiers

Local EPrints ID: 57265
URI: http://eprints.soton.ac.uk/id/eprint/57265
ISSN: 0146-9592
PURE UUID: 28ef5f94-0053-4f3b-ac07-5251040c4220
ORCID for W.S. Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712
ORCID for J.G. Frey: ORCID iD orcid.org/0000-0003-0842-4302

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Date deposited: 13 Aug 2008
Last modified: 10 Dec 2019 01:59

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Contributors

Author: C.A. Froud
Author: E.T.F. Rogers
Author: D.C. Hanna
Author: W.S. Brocklesby ORCID iD
Author: M. Praeger
Author: A.M. de Paula
Author: J.J. Baumberg
Author: J.G. Frey ORCID iD

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