S. Cavalieri et R. Eramo, A LINESHAPE STUDY OF RESONANT MULTIPHOTON IONIZATION PROCESS - EFFECTOF LASER BANDWIDTH ON THE POWER BROADENING, Optics communications, 118(3-4), 1995, pp. 245-249
The spectral broadening of the two-photon resonant, three-photon ionis
ation is investigated in sodium. A simple model, involving Bloch-type
equations, is found to compare favourably with the experimental result
s. The effect of power broadening combines with both the finite laser
bandwidth and the lifetime broadening, making the selectivity of the i
onisation process critically dependent on the laser monochromaticity.