T. Efthimiopoulos et E. Koudoumas, INTENSITY AND RESONANCE EFFECTS ON THE 3-PHOTON RESONANT 3RD-HARMONICGENERATION IN HG, Applied physics. B, Photophysics and laser chemistry, 54(3), 1992, pp. 193-198
The possible mechanism for the generation of near three photon resonan
t third-harmonic in the low energy side of the 6(1)P1 state of Hg is d
escribed. It is shown that the existence of strong ac Stark effect, du
e to the presence of the additional resonance 6(1)P1 - 6(1)D2 via the
fundamental photon, results in a spatially dependent phase mismatch, w
hich can lead to nonzero radiation in the DELTA-k > 0 region. Addition
ally, the influence of the ac Stark effect as a saturation mechanism w
ith increased incoming radiation power is described.