Generation of attosecond pulses in molecular nitrogen

H. Wabnitz; Y. Mairesse; L. J. Frasinski; M. Stankiewicz; W. Boutu; P. Breger; P. Johnsson; H. Merdji; P. Monchicourt; P. Salières; K. Varjú; M. Vitteau; B. Carré

doi:10.1140/epjd/e2006-00148-5

EPJ

Generation of attosecond pulses in molecular nitrogen

H. Wabnitz¹, Y. Mairesse¹, L. J. Frasinski², M. Stankiewicz²^,3, W. Boutu¹, P. Breger¹, P. Johnsson⁴, H. Merdji¹, P. Monchicourt¹, P. Salières¹, K. Varjú⁴, M. Vitteau¹ and B. Carré¹

¹ CEA/DSM/DRECAM/SPAM, bâtiment 522, Centre d'Études de Saclay, 91191 Gif-sur-Yvette, France
² J.J. Thomson Physical Laboratory, The University of Reading, Whiteknights, Reading, RG6 6AF, UK
³ Institute of Physics, Jagellonian University, ul. Reymonta 4, 30-059 Krakow, Poland
⁴ Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden

Received: 13 December 2005
Revised: 16 March 2006
Published online: 28 June 2006

Abstract

We have generated attosecond pulse trains in an ensemble of randomly aligned nitrogen molecules. Measurements of the high-order harmonic relative phases and amplitudes allow us to reconstruct the temporal profile of the attosecond pulses. We show that in the considered spectral range, the latter is very similar to the pulse train generated in argon under the same conditions. We discuss the possible influence of the molecular structure in the generation process, and how it can induce subtle differences on the relative phases.

PACS: 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation / 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression / 33.80.Wz – Other multiphoton processes

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EPJ

Generation of attosecond pulses in molecular nitrogen

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