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W/cm2 are introduced into a 1.8-cm hollow fiber in room air. From the observation of the third-harmonic beam quality and spectra, it is clarified that the harmonics are pumped at the leading edge of the fundamental pulse. The model calculation accounting for the nonlinear refractive index change of air shows a quantitative agreement with the experimental results.
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Received: 19 September 1997/Revised version: 2 December 1997
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Tamaki, Y., Midorikawa, K. & Obara, M. Phase-matched third-harmonic generation by nonlinear phase shift in a hollow fiber . Appl Phys B 67, 59–63 (1998). https://doi.org/10.1007/s003400050475
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DOI: https://doi.org/10.1007/s003400050475