Observation of Induced Phase Modulation of Femtosecond Pulses in Glass and Organic Fibers
Since spectral broadening of a weak, picosecond pulse (I2 pulse) was observed due to phase-modulation induced (IPM) by a second, independent and intense pulse (I1 pulse) at a different wavelength in condensed media , picosecond or femtosecond pulse compressions using IPM in fibers were proposed and analyzed [2–7]. However, IPM phenomena in the femtosecond time-region in fibers have not been yet made clear experimentally. In this paper, we report the first observation of IPM for femtosecond pulses propagating in a fused-silica glass fiber (glass fiber) and a DAN (4-(N, N-dimethylamino)-3-acetamidonitrobenzene) single crystal-cored fiber (DAN fiber) . Furthermore, it is shown that the latter’s ultrafast nonlinear refractive index n2.DAN, whose value has been so far unknown to our knowledge, is much larger than the former’s n2.G.
KeywordsGlass Fiber Input Power Spectral Width Output Pulse Input Pulse
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