| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:44 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
XUV attosecond pulses utilized for high resolution imagery
Authors:
V. IANCU (1), L. QUINTARD (2), J. NEJDL (3), E. CONSTANT (2)
Affiliation:
1) Faculty of Physics, University of Bucharest, Magurele, Ilfov, Romania
2) Centre Lasers Intenses et Applications, Bordeaux, France
3) Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
E-mail
vicentiu_iancu@yahoo.com
Keywords:
High harmonic generation, Terawatt femtosecond laser, attosecond pulses, ionization-induced spectral broadening, high-energy post-compression, spatial and spectral XUV structures
Abstract:
During the last decades, a considerable international effort was dedicated towards the developing of new ways and/or improving the existing ones in order to increase the energy of the extreme ultraviolet pulses by utilizing high power ultrashort TW pulses [1]. Such approaches, using fundamental pulses, brings to light particular constraints that need to be addressed. Within the present study, a post-compression of high energy pulses by optical-field ionization of a low pressure helium was performed in a guided geometry [2,3]. A TW chirped-pulse-amplification based Ti:Sapphire laser system, delivering high-peak power pulses of 150 mJ with a 35 fs pulse duration (FWHM) around 800 nm at a repetition rate of 10 Hz, has been employed to carry out high harmonic generation in a loose focusing geometry in Kr and Ar [2]. The XUV beam was subjected to both spatial and spectral characterization by a single-shot spatially resolved spectral detection system, being in good agreement with previous studies [3]. At TW level and under vacuum conditions, the stability of the post-compressed pulses was also demonstrated, and a structured continuous XUV spectra has been observed [4,5]. The influence of several parameters, such as the iris diameter and the pressure within the gas-filled cell, on the XUV flux was studied as well. Under optimum conditions, by implementing XUV photodiodes, a 1.6∙10^8 photons/pulse was obtained. In order to better characterize the XUV beam, temporal measurements are foreseen as perspectives.
References:
[1] A. Dubrouil, O. Hort, F. Catoire, D. Descamps, S. Petit, E. Mevel, V.V. Strelkov and E. Constant; Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses; Nat. Comun. 5, 4637, 1-8, 2014.
[2] O. Hort, A. Dubrouil, A. Cabasse, S. Petit, E. Mevel, D. Descamps and E. Constant; Post-compression of high energy terawatt-level femtosecond pulses and application to high order harmonic generation; J. Opt. Soc. Am. B 32(6), 1-9, 2015.
[3] C.F Dutin, A. Dubrouil, S. Petit, E. Mevel, E. Constant and D. Descamps; Post-compression of high-energy femtosecond pulses using gas ionization; Opt. Lett. 35(2), 253-255, 2010.
[4] E. Constant, A. Dubrouil, O. Hort, S. Petit, D. Descamps and E. Mevel, Spatial shaping of intense femtosecond beams for the generation of high-energy attosecond pulses; J. Phys. B: At. Mol. Opt. Phys. 45, 074018, 1-16, 2012.
[5] G. Sansone, L. Poletto and M. Nisoli; High-energy attosecond light sources; Nat. Photonics 5, 655-663, 2011.
Acknowledgement:
The present study was undertaken within the M2 Master Recherche Physique at Centre Lasers Intenses et Applications, Bordeaux, France.
|
|
|
|