Abstract
We present experimental observations of the spectral expansion of fs-pulses compressing in optical fibers. Using the input pulse frequency chirp we are able to scan through the pulse compression spectra and observe in detail the emergence of negative-frequency resonant radiation (NRR), a recently discovered pulse instability coupling to negative frequencies. We observe how the compressing pulse is exciting NRR as long as it overlaps spectrally with the resonant frequency. Furthermore, we observe that optimal pulse compression can be achieved at an optimal input chirp and for an optimal fiber length. Our measurements are supported by simulations of the compressing pulse propagation. The results are important for Kerr-effect pulse compressors, to generate novel light sources, as well as for the observation of quantum vacuum radiation.
Highlights
Negative resonant radiation (NRR) is a recently discovered dispersive wave generation process in nonlinear optical media [1]
In this paper we present to the best of our knowledge the first detailed investigation of chirp looking beyond the idea of delayed pulse compression
We look at a regime of shorter pulses (
Summary
Negative resonant radiation (NRR) is a recently discovered dispersive wave generation process in nonlinear optical media [1]. The dependence on chirp of various aspects of pulse evolution have been considered previously including the effect on supercontinuum generation [26,27,28,29] and spectral broadening [30, 31]. The results show an increased spectral broadening at the end of a (10 cm) piece of fiber when the input pulse chirp is positive and balanced by the total negative dispersion over the fiber length. This occurs because the input chirp must be compensated, delaying pulse compression. Our observations are in qualitative agreement with the analytical description of NRR evolution in fibers [3, 2]
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