Quantitative analysis of third harmonic generation of XUV radiation in a cell and a cw free jet of carbon monoxide
Abstract
In the theory, the twophoton resonant thirdorder nonlinear susceptibility of a molecular gas is calculated. The variations of this susceptibility, with the rotational quantum numbers of the resonant states, are given in the case of two singlet states of different symmetries, Σ and Π. In the experiment, third harmonic generation of XUV light (94.597.5 nm) is obtained with and without twophoton resonance. The gaseous nonlinear medium is formed by CO as used either in a cell, or in a continuous supersonic free jet zone of silence. The intensity of the third harmonic wave generated is well related to the laser power, phasematching conditions, twophoton resonances, and rotational temperature, through the nonlinear susceptibility, as described theoretically.
 Publication:

Journal of Chemical Physics
 Pub Date:
 May 1987
 DOI:
 10.1063/1.452548
 Bibcode:
 1987JChPh..86.5246A
 Keywords:

 Carbon Monoxide Lasers;
 Continuous Wave Lasers;
 Extreme Ultraviolet Radiation;
 Free Jets;
 Harmonic Generations;
 Electric Fields;
 Fourier Series;
 Hamiltonian Functions;
 Molecular Gases;
 Wave Functions;
 Lasers and Masers