From Raman Frequency Combs to Supercontinuum Generation in Nitrogen‐Filled Hollow‐Core Anti‐Resonant Fiber

Gao, Shoufei; Belli, Federico; Brahms, Christian; Travers, John C.

doi:10.1002/lpor.202100426

Cited by 18 publications

(6 citation statements)

References 56 publications

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“…Although there are a few prior works deriving the scalar model for rotational SRS in gases, they neglect its anisotropic nature. 76,186,190,205–208 Here, we aim to address this gap by introducing a vector UPPE for gases.…”

Section: Vector Properties Of Raman Responsesmentioning

confidence: 99%

“… 63,92,141,151–153,210,212–215 While vibrational SRS can potentially produce sub-femtosecond pulses, rotational SRS is usually preferred in experiments because the longer period makes it easier to reach the impulsive regime. In addition, it can fill the spectral gap between vibrational Stokes/anti-Stokes wavelengths to create a smooth supercontinuum 76 for potential generation of a single ultrashort pulse. It has long been known that rotational SRS is sensitive to the polarization of the field.…”

Section: Vector Properties Of Raman Responsesmentioning

confidence: 99%

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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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Section: Vector Properties Of Raman Responsesmentioning

confidence: 99%

Section: Vector Properties Of Raman Responsesmentioning

confidence: 99%

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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“…But it is difficult to generate the UV region SC below 400 nm, especially in the deep UV band. So, lots of studies have been explored for the generation of UV SC [8][9][10][11][12][13][14][15][16][17]. Based on the previous research, it is possible to extend the short wavelength of SC below 400 nm in several different * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

A theoretical study on deep ultraviolet supercontinuum generation in subwavelength optical fiber

Shi,

Gu,

Zhang

2024

J. Opt.

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In order to obtain supercontinuum spectra in the deep ultraviolet region, a generation method ofultraviolet supercontinuum is proposed based on subwavelength fiber composed of background material MgF2. The nonlinear Schrödinger equation is solved by the split-step fourier method, the optical fiber transmission characteristics are analyzed by the full-vector finite element, and the evolution of the pumping light into supercontinuum is numerically simulated in detail. The results of the numerical analysis show that the supercontinuum

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“…While their use in nonlinear optics dates back to the 1970s [1], they have found widespread application in the temporal compression of high-energy laser pulses [2,3]. The high damage threshold, long interaction length, and tuneable nonlinearity and dispersion have further enabled frequency conversion via four-wave mixing [4,5], spatio-temporal self-compression [6], supercontinuum generation [7,8], and a range of other nonlinear dynamical effects [9,10]. The combination of hollow-core waveguides with soliton self-compression and other associated dynamics offers some unique capabilities, such as pulse compression to sub-cycle field transients and frequency conversion to few-femtosecond pulses from the vacuum ultraviolet to the near infrared [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Soliton self-compression and resonant dispersive wave emission in higher-order modes of a hollow capillary fibre

Brahms

Travers

2022

J. Phys. Photonics

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We investigate soliton self-compression and ultraviolet resonant dispersive wave emission in the higher-order modes of a gas-filled hollow capillary fibre (HCF). Our simple analytical scaling rules predict shorter required waveguides and different energy scales when moving from the fundamental to higher-order modes. Experimentally, we demonstrate soliton self-compression and ultraviolet dispersive wave emission in the double-lobe LP11 mode of an argon-filled HCF, which we excite by coupling into the fibre at oblique incidence. We observe the generation of ultraviolet dispersive waves which are frequency-shifted and more narrowband as compared to fundamental-mode generation due to the stronger modal dispersion, and a suppression of the supercontinuum between the dispersive wave and the pump pulse. With numerical simulations, we confirm the predictions of our scaling rules and find that the use of higher-order modes can suppress photoionisation and plasma effects even while allowing for much higher pulse energy to be used in the self-compression process. Our results add another degree of freedom for the design of hollow-waveguide systems to generate sub-cycle field transients and tuneable ultrashort laser pulses.

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From Raman Frequency Combs to Supercontinuum Generation in Nitrogen‐Filled Hollow‐Core Anti‐Resonant Fiber

Cited by 18 publications

References 56 publications

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

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

A theoretical study on deep ultraviolet supercontinuum generation in subwavelength optical fiber

Soliton self-compression and resonant dispersive wave emission in higher-order modes of a hollow capillary fibre

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