Open AccessTemporal and spectral structure of the infrared pulse during the high order harmonic generation
Author(s) -
Warein Holgado,
Benjamín González Alonso,
Julio San Román,
Íñigo J. Sola
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.010191
Subject(s) - high harmonic generation , harmonics , infrared , optics , pulse (music) , harmonic , physics , context (archaeology) , pulse shaping , materials science , laser , acoustics , paleontology , quantum mechanics , voltage , detector , biology
We present, for the first time, the complete pulse characterization of the infrared pulse after generating harmonics. A systematic study of the high harmonic generation process, and the generating infrared pulse characterization, has been done by changing the focus-gas-jet relative position. We have concluded, supported by nonlinear propagation simulations, that there is a correlation between the spectral and temporal nonlinear evolution of the infrared generating field and the structures shown in the harmonic signal. We have identified two different pressure regimes: the low pressure regime, characterized by the effects produced by the plasma generated by the infrared pulse, and the high pressure regime where the plasma and the Kerr effect generated by the infrared field are both present. These observations highlight the important role played by the nonlinear propagation of the generating field in the high harmonic generation context.