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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 22 — Nov. 15, 2010
  • pp: 3820–3822

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. Kozlová, J. Nejdl, M. Sawicka, J. Polan, M. Kalal, and B. Rus  »View Author Affiliations


Optics Letters, Vol. 35, Issue 22, pp. 3820-3822 (2010)
http://dx.doi.org/10.1364/OL.35.003820


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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 10 12 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 ( η solid = 0.946 ) and expected plasma values are produced in the warm dense plasma created by laser irradiation due to bound-free absorption in C + .

© 2010 Optical Society of America

OCIS Codes
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(340.7450) X-ray optics : X-ray interferometry

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: September 8, 2010
Revised Manuscript: October 14, 2010
Manuscript Accepted: October 20, 2010
Published: November 9, 2010

Citation
L. M. R. Gartside, G. J. Tallents, A. K. Rossall, E. Wagenaars, D. S. Whittaker, M. Kozlová, J. Nejdl, M. Sawicka, J. Polan, M. Kalal, and B. Rus, "Extreme ultraviolet interferometry of warm dense matter in laser plasmas," Opt. Lett. 35, 3820-3822 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-22-3820

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