Enhancement of third-harmonic generation in nonlocal spatial solitons.
We report on the observation of Type I third-harmonic generation induced by a train of femtosecond laser pulses in nematic liquid crystals. We find that as the average power of the train is increased, the frequency conversion process is enhanced as a consequence of the tight confinement of the pulses into a nonlocal spatial soliton.
INRS Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel Boulet, Varennes Québec, J3X 1S2 Canada. peccianti@emt.inrs.ca
M
M
Peccianti
A
A
Pasquazi
G
G
Assanto
R
R
Morandotti