scispace - formally typeset
Search or ask a question
Topic

Supercontinuum

About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the effect of modulational instability in liquid-core photonic crystal fibers (LCPCF) with CS${}_{2}$-filled central core on supercontinuum generation was investigated.
Abstract: We theoretically investigate the supercontinuum generation (SCG) on the basis of modulational instability (MI) in liquid-core photonic crystal fibers (LCPCF) with CS${}_{2}$-filled central core. The effect of saturable nonlinearity of LCPCF on SCG in the femtosecond regime is studied using an appropriately modified nonlinear Schr\"odinger equation. We also compare the MI induced spectral broadening with SCG obtained by soliton fission. To analyze the quality of the pulse broadening, we study the coherence of the SC pulse numerically. It is evident from the numerical simulation that the response of the saturable nonlinearity suppresses the broadening of the pulse. We also observe that the MI induced SCG in the presence of saturable nonlinearity degrades the coherence of the SCG pulse when compared to unsaturated medium.

58 citations

Journal ArticleDOI
TL;DR: It is found that an intrinsic form-birefringence on the order of 10−5 profoundly affects the SC generation in a DFDD-ANDi photonic crystal fiber, and the fabrication of polarization-maintaining DFDD -ANDi fibers is proposed to avoid these adverse effects in pursuing a practical coherent fiber SC laser.
Abstract: Dispersion-flattened dispersion-decreased all-normal dispersion (DFDD-ANDi) photonic crystal fibers have been identified as promising candidates for high-spectral-power coherent supercontinuum (SC) generation. However, the effects of the unintentional birefringence of the fibers on the SC generation have been ignored. This birefringence is widely present in nonlinear non-polarization maintaining fibers with a typical core size of 2 µm, presumably due to the structural symmetry breaks introduced in the fiber drawing process. We find that an intrinsic form-birefringence on the order of 10−5 profoundly affects the SC generation in a DFDD-ANDi photonic crystal fiber. Conventional simulations based on the scalar generalized nonlinear Schrodinger equation (GNLSE) fail to reproduce the prominent observed features of the SC generation in a short piece (9-cm) of this fiber. However, these features can be qualitatively or semi-quantitatively understood by the coupled GNLSE that takes into account the form-birefringence. The nonlinear polarization effects induced by the birefringence significantly distort the otherwise simple spectrotemporal field of the SC pulses. We therefore propose the fabrication of polarization-maintaining DFDD-ANDi fibers to avoid these adverse effects in pursuing a practical coherent fiber SC laser.

58 citations

Journal ArticleDOI
TL;DR: Polarization dynamics of femtosecond light pulses propagating in air is studied by computer simulation and a rich variety of dynamics is found that depends on the initial polarization state and power of the pulse.
Abstract: Polarization dynamics of femtosecond light pulses propagating in air is studied by computer simulation. A rich variety of dynamics is found that depends on the initial polarization state and power of the pulse. Effects of polarization on the plasma and supercontinuum generation are also discussed.

57 citations

Journal ArticleDOI
TL;DR: In this paper, the modulational instability (MI) of the higher-order nonlinear Schrodinger (HNLS) equation with non-Kerr nonlinearities in an optical context was studied.
Abstract: We have studied the modulational instability (MI) of the higher-order nonlinear Schrodinger (HNLS) equation with non-Kerr nonlinearities in an optical context and presented an analytical expression for MI gain to show the effects of non-Kerr nonlinearities and higher-order dispersions on MI gain spectra. In our study, we demonstrate that MI can exist not only for the anomalous group-velocity dispersion (GVD) regime, but also in the normal GVD regime in the HNLS equation in the presence of non-Kerr quintic nonlinearities. The non-Kerr quintic nonlinear effect reduces the maximum value of the MI gain and bandwidth and plays a sensitive role over the Kerr nonlinearity, which leads to continuous wave breaking into a number of stable wave trains of ultrashort optical pulses that can be used to generate the stable supercontinuum white-light coherent sources.

57 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a method to generate an isolated attosecond (as) pulse in combination with a chirped fundamental laser field and a subharmonic laser field.
Abstract: We propose a method to generate an isolated attosecond (as) pulse in combination with a chirped fundamental laser field ($5$ fs, $800$ nm) and a subharmonic laser field ($12$ fs, $1600$ nm). It is shown that, for the case of the chirped parameter $\ensuremath{\beta}=0.25$, not only is the efficiency of the extended harmonics enhanced, but also an ultrabroad supercontinuum is formed in the second plateau. For the case of $\ensuremath{\beta}=0.65$, an ultrabroad supercontinuum spectrum with the width of about $1670$ eV can be observed. Furthermore, due to the introduction of chirped pulse, the short quantum trajectory is enhanced, and the long one is suppressed. By superposing a properly selected range of the harmonic spectrum in the continuum region, an intense isolated 38-as pulse is generated.

57 citations


Network Information
Related Topics (5)
Photonics
37.9K papers, 797.9K citations
93% related
Photonic crystal
43.4K papers, 887K citations
92% related
Optical fiber
167K papers, 1.8M citations
92% related
Laser
353.1K papers, 4.3M citations
87% related
Plasmon
32.5K papers, 983.9K citations
87% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023184
2022440
2021341
2020411
2019528
2018442