Open AccessThird harmonic generation in self-focused filaments in liquids
Author(s) -
Guilin Mao,
Yan Wu,
Kenneth D. Singer
Publication year - 2007
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.004857
Subject(s) - optics , femtosecond , self phase modulation , high harmonic generation , energy conversion efficiency , wavelength , materials science , nonlinear optics , harmonic , phase (matter) , phase modulation , second harmonic generation , physics , modulation (music) , laser , optoelectronics , phase noise , quantum mechanics , acoustics
Intense filaments of third harmonic generation have been observed in a variety of liquids when pumped by 1300 nm wavelength femtosecond light. The onset of third harmonic generation coincides with the threshold for self-focusing as deduced from n(2) measurements performed on the liquids using the z-scan technique. We have found self-phase modulation above the threshold leading to continuum generation at about 3 times threshold. In the third-harmonic regime, the third harmonic output power is independent of the input power. Our observations are consistent with those for similar processes in gases as described by a phase-locking model. The measured conversion efficiency was approximately 10(6).