Raman-induced temporal condensed matter physics in gas-filled photonic crystal fibers

Saleh, Mohammed F.; Armaroli, Andrea; Tran, Truong X.; Marini, Andrea; Belli, Federico; Abdolvand, A.; Biancalana, Fabio

doi:10.1364/oe.23.011879

Cited by 14 publications

(27 citation statements)

References 38 publications

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“…In particular, single-mode multi-core fibers (SM-MCFs) allow us to increase the channel capacity limit of SMFs by exploiting six signal dimensions (time, wavelength, amplitude, phase, polarization and space) through spatial multi-dimensional modulation formats with a reduced digital signal processing at the receiver 5–8 . Interestingly, single-core fibers have also been used as an experimental platform for testing different phenomena related to diverse branches of physics, such as fluid dynamics, quantum mechanics, general relativity and condensed matter physics, as well as to develop applications in other fields 9–16 . Along this line, MCFs are potential laboratories that could extend the possibilities offered by single-core fibers.…”

Section: Introductionmentioning

confidence: 99%

Ultra-short pulse propagation model for multi-core fibers based on local modes

Macho

García-Meca

Fraile-Peláez

et al. 2017

Sci Rep

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Multi-core fibers (MCFs) have sparked a new paradigm in optical communications and open new possibilities and applications in experimental physics and other fields of science, such as biological and medical imaging. In many of these cases, ultra-short pulse propagation is revealed as a key factor that enables us to exploit the full potential of this technology. Unfortunately, the propagation of such pulses in real MCFs has not yet been modelled considering polarization effects or typical random medium perturbations, which usually give rise to both longitudinal and temporal birefringent effects. Using the concept of local modes, we develop here an accurate ultra-short pulse propagation model that rigorously accounts for these phenomena in single-mode MCFs. Based on this theory, we demonstrate analytically and numerically the intermodal dispersion between different LP01 polarized core modes induced by these random perturbations when propagating femtosecond pulses in the linear and nonlinear fiber regimes. The ever-decreasing core-to-core distance significantly enhances the intermodal dispersion induced by these birefringent effects, which can become the major physical impairment in the single-mode regime. To demonstrate the power of our model, we give explicit strategies to reduce the impact of this optical impairment by increasing the MCF perturbations.

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Section: Introductionmentioning

confidence: 99%

Ultra-short pulse propagation model for multi-core fibers based on local modes

Macho

García-Meca

Fraile-Peláez

et al. 2017

Sci Rep

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“…Very recently, we have treated this modulation as a periodic temporal crystal [20] and we have proposed to use hydrogen-filled HC-PCFs to observe the analogue condensed matter physics phenomena, such as the Wannier-Stark ladder [24], the Bloch oscillations [25] and Zener tunneling [26]. In this Letter, we investigate the case when the delayed pulse is another strong fundamental soliton rather than a weak probe pulse as in [20]. The delayed soliton can be treated as a particle in a moving periodic potential induced by the * Corresponding author: m.saleh@hw.ac.uk leading soliton.…”

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confidence: 99%

“…We have previously shown that this set of equations can be simplified to a single generalized nonlinear Schrödinger equation for femtosecond pulses with an energy of a few micro-Joules [20],…”

mentioning

confidence: 99%

“…Moreover, a sinusoidal temporal modulation of the medium refractive index lagging the pulse has been detected by launching a delayed weak probe within the dephasing time [21][22][23]. Very recently, we have treated this modulation as a periodic temporal crystal [20] and we have proposed to use hydrogen-filled HC-PCFs to observe the analogue condensed matter physics phenomena, such as the Wannier-Stark ladder [24], the Bloch oscillations [25] and Zener tunneling [26]. In this Letter, we investigate the case when the delayed pulse is another strong fundamental soliton rather than a weak probe pulse as in [20].…”

mentioning

confidence: 99%

“…When the soliton durations ≪ 1/δ, their Raman response functions can be approximated by using a Taylor expansion [20],…”

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confidence: 99%

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Strong Raman-induced noninstantaneous soliton interactions in gas-filled photonic crystal fibers

Saleh¹,

Armaroli²,

Marini³

et al. 2015

Opt. Lett.

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We have developed an analytical model based on the perturbation theory in order to study the optical propagation of two successive intense solitons in hollow-core photonic crystal fibers filled with Raman-active gases. Based on the time delay between the two solitons, we have found that the trailing soliton dynamics can experience unusual nonlinear phenomena such as spectral and temporal soliton oscillations and transport towards the leading soliton. The overall dynamics can lead to a spatiotemporal modulation of the refractive index with a uniform temporal period and a uniform or chirped spatial period.Raman scattering involves the transfer of a small fraction of energy of an optical field to another field at longer wavelengths via inelastic scattering with optical phonons supplied by the medium. The Raman self-frequency redshift, first observed in conventional optical fibers [1][2][3], can continuously downshift the central frequency of a single pulse during propagation. With the invention of solid-silica-core photonic crystal fibers (PCFs) [4,5], this process has been demonstrated and extensively exploited in attaining a broad supercontinuum [6]. The main ingredients are the high confinement of light and tunability dispersion provided by these fibers. Gas-filled hollowcore (HC) PCFs with Kagome lattice have become a strong competitor for solid-silica-core PCFs [7,8]. Besides the latter benefits, a wide range of gases with different properties offers several opportunities to demonstrate new phenomena and applications using optical fibers [9][10][11][12][13][14][15][16][17][18][19][20].Raman scattering processes in gases are characterized by having very long molecular coherence relaxation (dephasing) time (∼ps), at least three orders of magnitude higher than silica glass. Within this time, the medium possesses a high non-instantaneous nonlinear response. A Raman-induced continuous downshift of the frequency of an ultrashort pulse propagating in a gas has been observed [21]. Moreover, a sinusoidal temporal modulation of the medium refractive index lagging the pulse has been detected by launching a delayed weak probe within the dephasing time [21][22][23]. Very recently, we have treated this modulation as a periodic temporal crystal [20] and we have proposed to use hydrogen-filled HC-PCFs to observe the analogue condensed matter physics phenomena, such as the Wannier-Stark ladder [24], the Bloch oscillations [25] and Zener tunneling [26]. In this Letter, we investigate the case when the delayed pulse is another strong fundamental soliton rather than a weak probe pulse as in [20]. The delayed soliton can be treated as a particle in a moving periodic potential induced by the * Corresponding author: m.saleh@hw.ac.uk leading soliton. Phenomena such as spectral and temporal soliton oscillations as well as upgrading the temporal crystal to a spatiotemporal one are predicted here.Pulse propagation in Raman-active gases is governed by the interplay between the Maxwell equations and the Bloch equations of an effective two...

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Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes

Chen,

Wise

2024

APL Photonics

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Raman scattering has found renewed interest owing to the development of gas-filled hollow-core fibers, which constitute a unique platform for exploration of novel ultrafast nonlinear phenomena beyond conventional solid-core-fiber and free-space systems. Much progress has been made through models for particular interaction regimes, which are delineated by the relation of the excitation pulse duration to the time scales of the Raman response. However, current experimental settings are not limited to one regime, prompting the need for tools spanning multiple regimes. Here, we present a theoretical framework that accomplishes this goal. The theory allows us to review recent progress with a fresh perspective, makes new connections between distinct temporal regimes of Raman scattering, and reveals new degrees of freedom for controlling Raman physics. Specific topics that are addressed include transient Raman gain, the interplay of electronic and Raman nonlinearities in short-pulse propagation, and interactions of short pulses mediated by phonon waves. The theoretical model also accommodates vector effects, which have been largely neglected in prior works on Raman scattering in gases. The polarization dependence of transient Raman gain and vector effects on pulse interactions via phonon waves is investigated with the model. Throughout this Perspective, theoretical results are compared to the results of realistic numerical simulations. The numerical code that implements the new theory is freely available. We hope that the unified theoretical framework and numerical tool described here will accelerate the exploration of new Raman-scattering phenomena and enable new applications.

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Raman-induced temporal condensed matter physics in gas-filled photonic crystal fibers

Cited by 14 publications

References 38 publications

Ultra-short pulse propagation model for multi-core fibers based on local modes

Ultra-short pulse propagation model for multi-core fibers based on local modes

Strong Raman-induced noninstantaneous soliton interactions in gas-filled photonic crystal fibers

Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes

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