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Supercontinuum
About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.
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TL;DR: In this article, the authors investigate the generation mechanisms for ultra-wide spectra in nonlinear optical fibers and show that Soliton fission and modulation instability represent fundamental mechanisms for the generation process, and the interplay between these two effects leads to various characteristics of the resulting spectra, which are modified by the relative impact of modulation instability.
Abstract: We investigate the generation mechanisms for ultra-wide spectra in nonlinear optical fibers. Soliton fission and modulation instability represent fundamental mechanisms for the generation process. The primary origin of the spectral broadening changes with the pump-pulse duration. Soliton fission dominates for low input power and short pulses. Its efficiency for supercontinuum generation and especially the extension to the blue side can be increased by proper design of the dispersion profile. The modulation instability has a strong impact for high input powers and greatly enhances the generation process, but leads to a degradation of the coherence properties. Also for short pulses with durations of 60 fs the modulation instability is present and can hardly be suppressed. The interplay between these two effects leads to various characteristics of the resulting spectra, which are modified by the relative impact of the modulation instability.
89 citations
TL;DR: In this article, the chirp of the xuv supercontinuum generated by a polarization gating was investigated by comparing three-dimensional nonadiabatic numerical simulations with classical calculations.
Abstract: The chirp of the xuv supercontinuum generated by a polarization gating is investigated by comparing three-dimensional nonadiabatic numerical simulations with classical calculations. The origin of the chirp is the dependence of the energy gain by an electron on the return time. The chirp is positive and its value is almost the same as that when a linearly polarized laser is used. Although the $250\text{\ensuremath{-}}\mathrm{eV}$-wide supercontinuum corresponds to a single attosecond pulse, the shortest duration of the pulse is limited by the chirp. By compensating the positive chirp with the negative group velocity dispersion of a Sn filter, it is predicted that a single $58\text{\ensuremath{-}}\mathrm{as}$ pulse can be generated.
88 citations
TL;DR: In this paper, the applicability of supercontinuum sources to the biomedical field is introduced, with the demonstration of promising results in flow cytometry, CARS microscopy and optical coherence tomography.
88 citations
TL;DR: It is shown that longer driving pulses can be applied to confine the efficient recollision of electron wave packet to half an optical cycle, and an attosecond pulse can be straightforwardly obtained just by filtering different range of the spectrum.
Abstract: We propose a method to generate broadband supercontinuum with a modulated polarization gating in the multi-cycle regime. The polarization gating at 1600 nm is employed to intensify the ellipticity dependence of high harmonic signal, and the adding second harmonic (SH) field is used for modulating ionization ratio between the driving field half-cycles. It is shown that longer driving pulses (6 optical cycles, 32.4 fs) can be applied to confine the efficient recollision of electron wave packet to half an optical cycle. The produced bandwidth of the extreme ultraviolet (XUV) supercontinuum is about 280 eV, corresponding to a fourier-transform-limited pulse of 10 as. In addition, an attosecond pulse of about 100 as with tunable wavelength can be straightforwardly obtained just by filtering different range of the spectrum.
88 citations
TL;DR: Numerically investigate mid-infrared supercontinuum (SC) generation in dispersion-engineered, air-clad, chalcogenide-glass channel waveguides employing two different materials, Ge(11.5)As(24)Se(64.5), and shows that SC can be extended even further when MgF(2) glass is used for the lower cladding of chalCogenide waveguide.
Abstract: We numerically investigate mid-infrared supercontinuum (SC) generation in dispersion-engineered, air-clad, Ge(11.5)As(24)Se(64.5) chalcogenide-glass channel waveguides employing two different materials, Ge(11.5)As(24)Se(64.5) or MgF(2) glass for their lower cladding. We study the effect of waveguide parameters on the bandwidth of the SC at the output of 1-cm-long waveguide. Our results show that output can vary over a wide range depending on its design and the pump wavelength employed. At the pump wavelength of 2 μm the SC never extended beyond 4.5 μm for any of our designs. However, supercontinuum could be extended to beyond 5 μm for a pump wavelength of 3.1 μm. A broadband SC spanning from 2 μm to 6 μm and extending over 1.5 octave could be generated with a moderate peak power of 500 W at a pump wavelength of 3.1 μm using an air-clad, all-chalcogenide, channel waveguide. We show that SC can be extended even further when MgF(2) glass is used for the lower cladding of chalcogenide waveguide. Our numerical simulations produced SC spectra covering the wavelength range 1.8-7.7 μm (> two octaves) by using this geometry. Both ranges exceed the broadest SC bandwidths reported so far. Moreover, we realize it using 3.1 μm pump source and relatively low peak power pulses. By employing the same pump source, we show that SC spectra can cover a wavelength range of 1.8-11 μm (> 2.5 octaves) in a channel waveguide employing MgF(2) glass for its lower cladding with a moderate peak power of 3000 W.
88 citations