High harmonic generation in Ne and H-2 gas mixtures

Sayrac M., Kolomenskii A. A. , Strohaber J., Schuessler H. A.

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, vol.32, no.12, pp.2400-2405, 2015 (SCI-Expanded) identifier identifier


High harmonic generation (HHG) enables the production of coherent light in the extreme-ultraviolet (XUV) spectral region. However, the radiation conversion efficiency from infrared to the XUV is low. We observed enhancement of HHG in gas mixtures of H-2 and Ne compared to pure gases H-2 or Ne. Our experiments show that at an intensity of similar to 1.5 x 10(14) W/cm(2) and in mixtures of gases with significantly different ionization potentials (IPs), the initial HHG takes place in the component with lower IP (H-2), inducing excited states and facilitating ionization and HHG in the component with higher IP (Ne). We show that the combination of the two gas components results in an enhancement or suppression of the output of high harmonics as compared to pure gases, which is also confirmed by the employed phenomenological model. (C) 2015 Optical Society of America