Abstract
The processes of third-harmonic and difference-frequency generation through the four-wave mixing of picosecond pulses in gas-filled hollow fibers are experimentally studied. Due to the improvement of phase-matching conditions with an appropriate choice of the gas pressure and optimal parameters of the hollow fiber, we were able to use hollow fibers with a large length (up to 30 cm) for difference-frequency generation, which resulted in a considerable increase in the power of the difference-frequency signal at the output of the fiber. Our experimental data reveal a considerable influence of high-order waveguide modes on four-wave mixing processes in a hollow fiber. It is shown that the waveguide regime of nonlinear optical interactions implemented in hollow fibers removes the limitations on the efficiency of third-harmonic and sum-frequency generation, which are characteristic of the tight-focusing regime in media with normal dispersion and which are due to the geometric phase shift arising in tightly focused light beams.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 120, No. 2, 2001, pp. 280–290.
Original Russian Text Copyright © 2001 by Naumov, Sidorov-Biryukov, Giammanco, Fedotov, Marsili, Ruffini, Kolevatova, Zheltikov.
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Naumov, A.N., Sidorov-Biryukov, D.A., Fedotov, A.B. et al. Four-wave mixing of picosecond pulses in hollow fibers: Phase matching and the influence of high-order waveguide modes. J. Exp. Theor. Phys. 93, 247–255 (2001). https://doi.org/10.1134/1.1402727
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DOI: https://doi.org/10.1134/1.1402727