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We review our recent work on the coherence of supercontinuum light. Our findings open the route for a universal definition of the coherence degree for broadband sources.
We study second-harmonic generation from arrays of anisotropic metal nanoparticles (metamolecules) as a function of their mutual arrangement. The overall second-harmonic response of such samples cannot be simply described by the orientational average of the individual metamolecules. Instead, the response can vary by more than an order of magnitude for the same average orientational distribution depending...
Stimulated Raman scattering plays a significant role in nonlinear fiber optics as for example in the generation of white-light supercontinua (SC) where it can lead to dynamics such as soliton fission and soliton self-frequency shift [1–3]. From a theoretical perspective, nonlinear pulse propagation and SC generation is often modelled using a generalized nonlinear Schrödinger equation where the Raman...
Resonant waveguide gratings (RWG) consist of a surface waveguide and a surface grating that diffracts light both into and out of the waveguide mode [1,2] for a particular angle of incidence. On resonance, the field diffracted out of the waveguide mode interferes with the directly transmitted and reflected fields in such a way that it is possible (at least theoretically) to obtain 100% reflection [1]...
Modulation instability (MI) is a universal phenomenon describing the nonlinear evolution of a periodic modulation superimposed on a plane wave background [1]. In an optical fiber context, MI manifests through the break-up of a continuous wave (CW) field into a train of ultrashort pulses and has been extensively studied in the context of high-repetition rate pulse train generation. In the absence of...
Supercontinuum (SC) generated in highly nonlinear fibers exhibit unique spectral, temporal and spatial coherence [1] which impacts directly the intended application. It is therefore important to be able to evaluate the coherence properties of SC light in a systematic way. The first attempt to describe the coherence of SC pulses was reported by Dudley and Coen who have introduced the modulus of a normalized...
Modulation instability (MI) describes the nonlinear evolution of a periodic modulation superimposed on a continuous wave (CW) background and it has been extensively studied in various contexts ranging from hydrodynamics to plasma physics and optical fibers. In the frequency domain, MI corresponds to the exponential amplification of the frequency components associated with the initial modulation at...
We report the first observation in optics of the Peregrine soliton, a novel class of nonlinear localized structure. Two experimental configurations are explored and the impact of non-ideal initial conditions is discussed.
We vary relative arrangement of anisotropic metal nanoparticles (metamolecules) in arrays. Their second-harmonic response is not a simple orientational average of the molecular responses. Instead, collective resonances of the structures dominate.
Using second-order coherence theory of nonstationary light we show that supercontinuum can be split into quasi-coherent and quasi-stationary parts. Our results opens the route for a universal definition of the coherence degree for broadband sources.
We show numerically in the context of supercontinuum generation in the long pulse regime that soliton collisions can lead to the generation of rare, extreme-amplitude dispersive waves with enhanced spectral shift.
We report on a novel effect in which soliton collisions can lead to the generation of dispersive wave with extreme peak power and enhanced spectral shift in a photonic crystal fiber with two zero-dispersion wavelengths.
We show that the development of the supercontinuum spectrum in the quasi-CW regime can be interpreted analytically in terms of Akhmediev Breathers. Theory and experiment are in excellent agreement.
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