Extreme ultraviolet interferometry of warm dense matter in laser plasmas

L. M.R. Gartside, G. J. Tallents, A. K. Rossall, E. Wagenaars, D. S. Whittaker, M. Kozlova, J. Nejdl, M. Sawicka, J. Polan, M. Kalal, B. Rus

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We demonstrate that interferometric probing with extreme ultraviolet (EUV) laser light enables determination of the degree of ionization of the "warm dense matter" produced between the critical and ablation surfaces of laser plasmas. Interferometry has been utilized to measure both transmission and phase information for an EUV laser beam at the photon energy of 58.5 eV, probing longitudinally through laser-irradiated plastic (parylene-N) targets (thickness 350 nm) irradiated by a 300 ps duration pulse of wavelength 438 nm and peak irradiance 1012 W cm-2. The transmission of the EUV probe beam provides a measure of the rate of target ablation, as ablated plasma becomes close to transparent when the photon energy is less than the ionization energy of the predominant ion species. We show that refractive indices η below the solid parylene N (ηsolid = 0.946) and expected plasma values are produced in the warm dense plasma created by laser irradiation due to bound-free absorption in C+.

Original languageEnglish
Pages (from-to)3820-3822
Number of pages3
JournalOptics Letters
Volume35
Issue number22
DOIs
Publication statusPublished - 9 Nov 2010
Externally publishedYes

Fingerprint

laser plasmas
interferometry
ultraviolet lasers
ablation
target thickness
ionization
dense plasmas
photons
irradiance
lasers
energy
pulse duration
plastics
laser beams
refractivity
irradiation
probes
wavelengths
ions

Cite this

Gartside, L. M. R., Tallents, G. J., Rossall, A. K., Wagenaars, E., Whittaker, D. S., Kozlova, M., ... Rus, B. (2010). Extreme ultraviolet interferometry of warm dense matter in laser plasmas. Optics Letters, 35(22), 3820-3822. https://doi.org/10.1364/OL.35.003820
Gartside, L. M.R. ; Tallents, G. J. ; Rossall, A. K. ; Wagenaars, E. ; Whittaker, D. S. ; Kozlova, M. ; Nejdl, J. ; Sawicka, M. ; Polan, J. ; Kalal, M. ; Rus, B. / Extreme ultraviolet interferometry of warm dense matter in laser plasmas. In: Optics Letters. 2010 ; Vol. 35, No. 22. pp. 3820-3822.
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Gartside, LMR, Tallents, GJ, Rossall, AK, Wagenaars, E, Whittaker, DS, Kozlova, M, Nejdl, J, Sawicka, M, Polan, J, Kalal, M & Rus, B 2010, 'Extreme ultraviolet interferometry of warm dense matter in laser plasmas', Optics Letters, vol. 35, no. 22, pp. 3820-3822. https://doi.org/10.1364/OL.35.003820

Extreme ultraviolet interferometry of warm dense matter in laser plasmas. / Gartside, L. M.R.; Tallents, G. J.; Rossall, A. K.; Wagenaars, E.; Whittaker, D. S.; Kozlova, M.; Nejdl, J.; Sawicka, M.; Polan, J.; Kalal, M.; Rus, B.

In: Optics Letters, Vol. 35, No. 22, 09.11.2010, p. 3820-3822.

Research output: Contribution to journalArticle

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AU - Gartside, L. M.R.

AU - Tallents, G. J.

AU - Rossall, A. K.

AU - Wagenaars, E.

AU - Whittaker, D. S.

AU - Kozlova, M.

AU - Nejdl, J.

AU - Sawicka, M.

AU - Polan, J.

AU - Kalal, M.

AU - Rus, B.

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AB - We demonstrate that interferometric probing with extreme ultraviolet (EUV) laser light enables determination of the degree of ionization of the "warm dense matter" produced between the critical and ablation surfaces of laser plasmas. Interferometry has been utilized to measure both transmission and phase information for an EUV laser beam at the photon energy of 58.5 eV, probing longitudinally through laser-irradiated plastic (parylene-N) targets (thickness 350 nm) irradiated by a 300 ps duration pulse of wavelength 438 nm and peak irradiance 1012 W cm-2. The transmission of the EUV probe beam provides a measure of the rate of target ablation, as ablated plasma becomes close to transparent when the photon energy is less than the ionization energy of the predominant ion species. We show that refractive indices η below the solid parylene N (ηsolid = 0.946) and expected plasma values are produced in the warm dense plasma created by laser irradiation due to bound-free absorption in C+.

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Gartside LMR, Tallents GJ, Rossall AK, Wagenaars E, Whittaker DS, Kozlova M et al. Extreme ultraviolet interferometry of warm dense matter in laser plasmas. Optics Letters. 2010 Nov 9;35(22):3820-3822. https://doi.org/10.1364/OL.35.003820