Third harmonic generation in self-focused filaments in liquids

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-...

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Bibliographic Details
Published in:Optics express 2007-04, Vol.15 (8), p.4857-4862
Main Authors: Mao, Guilin, Wu, Yeheng, Singer, Kenneth D
Format: Article
Language:English
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Summary: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).
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.15.004857