Generation of THz radiation through molecular modulation in hydrogen-filled hybrid anti-resonant fibers DOI Creative Commons
Sébastien Loranger,

Foroogh Jafari,

Joseba Zubía

и другие.

arXiv (Cornell University), Год журнала: 2023, Номер unknown

Опубликована: Янв. 1, 2023

We study the generation of narrowband terahertz (THz) pulses by stimulated Raman scattering and molecular modulation in hydrogen-filled hybrid hollow-core fibers. Using a judicious combination materials transverse structures, this waveguide design enables simultaneous confinement optical THz signals with reasonably low attenuation, as well high nonlinear overlap. The are then generated second Stokes band ns-long near-infrared pump pulse, aided coherence waves excited gaseous core beat-note created its first band. Optimization fiber characteristics facilitates phase matching between corresponding transitions while avoiding coherent gain suppression, resulting optical-to-THz conversion efficiencies up to 60%, confirmed rigorous numerical modelling under ideal conditions. When current material constraints considered, however, attainable relax 0.2%, still competitive value compared other systems. approach is principle power energy scalable, tunable 1 - 10 range without any spectral gaps, thereby opening new pathways development fiber-based sources complementary mature technologies such quantum cascade lasers.

Язык: Английский

Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes DOI Creative Commons
Yihao Chen, Frank W. Wise

APL Photonics, Год журнала: 2024, Номер 9(3)

Опубликована: Март 1, 2024

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

Язык: Английский

Процитировано

6
Femtosecond Hydrogen Raman Frequency-Shifter/Pulse-Compressor Based on Revolver Fiber DOI
Leonid L Losev, V S Pazyuk, A. V. Gladyshev

и другие.

IEEE Journal of Selected Topics in Quantum Electronics, Год журнала: 2024, Номер 30(6: Advances and Applications), С. 1 - 5

Опубликована: Март 4, 2024

Generation of 23-fs-long laser pulses with energy 8.5 μJ at the wavelength 1.8 μm is achieved by means Raman conversion 250-fs 50-μJ 1.03 μm. The simultaneous spectral broadening realized in a hydrogen-filled revolver fiber. Energy efficiency to Stokes as high 17% demonstrated.

Язык: Английский

Процитировано

4
Tutorial on Fourier Transform for Ultrafast Optics DOI Creative Commons
Yihao Chen

Опубликована: Янв. 23, 2025

This tutorial is designed for individuals who are new to the field of ultrafast optics. It was written in response apparent lack comprehensive introductions basic Fourier transform, extending beyond flat-phase description. Additionally, there a need complete derivations several relations involving maintaining its most general formulation. approach avoids arbitrary selection Fourier-transform constants and ensures understanding. shows importance having as parameters, which I would like advocate people do. Most important all, have seen misuse transform over my years discussion lab from others’ questions since shared code publicly on Github [https://github.com/AaHaHaa/MMTools]. Surprisingly, check correctness numerical implementation only by seeing if simulation result smooth it duplicates “overall physics,” this seems be widespread problem perspective, can solved simple (see Sec. 2B). why hope that help understand more about especially context Feel me send an email any confusion, or you think add tutorial.

Язык: Английский

Процитировано

0
Tutorial on Fourier and Hankel Transforms for Ultrafast Optics DOI Creative Commons
Yihao Chen

Опубликована: Янв. 29, 2025

This tutorial is designed for individuals who are new to the field of ultrafast optics. It was written in response apparent lack comprehensive introductions basic Fourier transform, extending beyond flat-phase description. Additionally, there a need complete derivations several relations involving maintaining its most general formulation. approach avoids arbitrary selection Fourier-transform constants and ensures understanding. shows importance having as parameters. Most important all, have been misuse transform from my observations, which cannot be easily detected by checking smoothness result numerical implementation or seeing if simulation duplicates “overall physics.” problem should solved simple (see Sec. 2.2). I hope that this can help people understand more about especially context In addition, Hankel arises two-dimensional spatial radially-symmetric function, provided. Its based on fast with high accuracy also provided, core element full-field propagation. Feel me send an email any confusion, you think add tutorial. For deeper understanding into pulse propagation involves these transforms, please check out our publicly-shared Github code [https://github.com/AaHaHaa/MMTools].

Язык: Английский

Процитировано

0
Accurate modeling of ultrafast nonlinear pulse propagation in multimode gain fiber DOI Creative Commons
Yihao Chen,

Henry Haig,

Yuhang Wu

и другие.

Journal of the Optical Society of America B, Год журнала: 2023, Номер 40(10), С. 2633 - 2633

Опубликована: Сен. 1, 2023

The nonlinear propagation of picosecond or femtosecond optical pulses in multimode fiber amplifiers underlies a variety intriguing physical phenomena as well the potential for scaling sources ultrashort to higher powers. However, existing theoretical models ultrashort-pulse amplification do not include some critical processes, and, result, they fail capture basic features experiments. We introduce numerical model that combines steady-state rate equations with unidirectional pulse equation, incorporating dispersion, Kerr and Raman nonlinearities, gain/loss-spectral effects mode-resolved treatment is computationally efficient. This allows investigation spatiotemporal processes are strongly affected by gain dynamics. Its capabilities illustrated through examinations few-mode fiber, amplification, beam cleaning amplifier.

Язык: Английский

Процитировано

6
Generation of THz radiation through molecular modulation in hydrogen-filled hybrid anti-resonant fibers DOI Creative Commons
Sébastien Loranger,

Foroogh Jafari,

Joseba Zubía

и другие.

Optics Express, Год журнала: 2024, Номер 32(5), С. 7622 - 7622

Опубликована: Фев. 7, 2024

We study the generation of narrowband terahertz (THz) pulses by stimulated Raman scattering and molecular modulation in hydrogen-filled hybrid hollow-core fibers. Using a judicious combination materials transverse structures, this waveguide design enables simultaneous confinement optical THz signals with reasonably low attenuation, as well high nonlinear overlap. The are then generated second Stokes band ns-long near-infrared pump pulse, aided coherence waves excited gaseous core beat-note created its first band. Optimization fiber characteristics facilitates phase matching between corresponding transitions while avoiding coherent gain suppression, resulting potential optical-to-THz conversion efficiencies up to 60%, confirmed rigorous numerical modelling under ideal zero-loss conditions. When current material constraints considered, however, attainable relax 0.2%, still competitive value compared other systems. approach is principle power energy scalable, tunable 1–10 range without any spectral gaps, thereby opening new pathways development fiber-based sources complementary mature technologies such quantum cascade lasers.

Язык: Английский

Процитировано

1
Narrowband stimulated Raman scattering and molecular modulation in anti-resonant hollow-core fibres DOI Creative Commons
Pau Arcos, Arturo Mena López, María Sánchez-Hernández

и другие.

EPL (Europhysics Letters), Год журнала: 2024, Номер 147(4), С. 45001 - 45001

Опубликована: Авг. 1, 2024

Abstract Raman scattering is the inelastic process where photons bounce off molecules, losing energy and becoming red-shifted. This weak effect unique to each molecular species, making it an essential tool in, e.g. , spectroscopy label-free microscopy. The invention of laser enabled a regime stimulated (SRS), efficiency greatly increased by inducing coherent oscillations. However, this phenomenon required high intensities due limited interaction volumes, limitation was overcome emergence anti-resonant fibres (ARFs) guiding light in small hollow channel over long distances. Based on their properties, Perspective reviews transformative impact ARFs modern SRS-based applications ranging from development sources convertors for materials science, quantum technologies future networks, providing insights into trends expanding horizons field.

Язык: Английский

Процитировано

1
Relativistic-guided stable mode of few-cycle 20 µm level infrared radiation DOI Creative Commons
Meiyu Si, Y. S. Huang, M. Q. Ruan

и другие.

Optics Express, Год журнала: 2023, Номер 31(24), С. 40202 - 40202

Опубликована: Окт. 31, 2023

The generation of intense infrared radiation with a wavelength greater than 10 µm is limited by the optical materials in traditional methods or laser-plasma parameters plasma-bubble methods. In this study, we propose new method for generating an longitudinal field tens GV/m. By utilizing oscillations electron film on inner surface micro-tube, excited relativistic beam propagating within it, it possible to obtain tunable long-wavelength few-cycle radiation, ranging from 20 30 and even longer. source guided entirely formed stable TM propagation mode micro-tube. This opens up opportunities applications intensity high-field physics, shorter attosecond pulses charged particle acceleration.

Язык: Английский

Процитировано

1
Long-wave-infrared pulse generation in H2-filled hollow-core fiber DOI
Yihao Chen, Jeffrey Moses, Frank W. Wise

и другие.

Опубликована: Янв. 1, 2024

We present a two-color and two-pulse approach to femtosecond pulse generation at long-wave-infrared wavelengths in H 2 -filled hollow-core fiber. The technique numerically produces 88-fs pulses 12 µm with 48 % quantum efficiency.

Язык: Английский

Процитировано

0
Relativistic-guided stable mode of few-cycle 20 μm level infrared radiation DOI Open Access
Yongsheng Huang, Meiyu Si, M. Q. Ruan

и другие.

Опубликована: Авг. 21, 2023

The generation of intense infrared radiation with a wavelength greater than 10 μm is limited by the optical materials traditional methods and laser-plasma parameters plasma-bubble methods. In this study, we propose new scheme to produce an field ~ tens GV/m, tunable long few-cycle from 20 30 even longer based on oscillations surface electron film that using relativistic beam propagates in micro-tube. source guided entirely formed stable $\mathrm{TM}$ propagation mode intensity are regulated changing micro-tube radius charge driving beam, both which change nearly linearly. This opens up opportunities for applications high-field physics, shorter attosecond pulses charged particle acceleration.

Язык: Английский

Процитировано

0