Abstract
We experimentally observed the periodic oscillatory structure in the second-harmonic spectrum when we simultaneously propagated intense fundamental and second-harmonic pulses from a Ti:sapphire laser-amplifier system in an argon-filled capillary fiber. The periodic oscillatory structure in the second-harmonic spectrum is only due to the induced-phase modulation (IPM) which, in general, is hidden because of strong self-phase modulation. It is found that this structure can be well explained by the interference of the electric field components in the second-harmonic pulse. These electric field components are generated based on IPM by the fundamental pulse. The theoretical analysis of the nonlinear pulse propagation agrees well with experimental results. In addition, the measured dependence of the modulated spectral behavior on the delay time, including the spectral feature, the oscillatory period and the range of the delay time between two pulses, indicates the excellent agreement with the numerical analysis which includes the medium and waveguide dispersion and the steepening effect.
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