Abstract

Unlike third-harmonic generation in a monochromatic field, which gives rise to a signal at the frequency 3ω0, with ω0 being the frequency of the pump field, a broadband ultrashort pump pulse can generate isolated spectral peaks that are substantially shifted from the frequency 3ω0. In the multimode guided-wave regime, this non-3ω third-harmonic generation maps adjacent guided modes of the third harmonic onto a manifold of spectral peaks around 3ω0. The spectral shifts and the widths of these peaks are controlled by the phase and group-velocity mismatch between the pump field and third-harmonic modes, as well as the length of nonlinear-optical interaction, allowing the spectral contents of the third-harmonic signal to be engineered by tailoring the dispersion of the pump and third-harmonic modes involved in the nonlinear-optical process. Photonic-crystal fibers possess a unique combination of properties required to achieve large frequency shifts in non-3ω third-harmonic generation, allowing efficient tunable frequency upconversion based on this phenomenon.

© 2005 Optical Society of America

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