Propagation dynamics of femtosecond laser pulses in a hollow fiber filled with argon: constant gas pressure versus differential gas pressure

Nurhuda, Muhammad; Suda, Akira; Midorikawa, Katsumi; Hatayama, Masatoshi; Nagasaka, Keigo

doi:10.1364/josab.20.002002

Cited by 65 publications

(28 citation statements)

References 10 publications

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“…Note that the minus sign before in Eq. (10) is different from that in refs 67 and 68 because of the different convention for the Fourier transform.…”

Section: Methodsmentioning

confidence: 81%

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Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses

Jin

Hong

Lin

2016

Sci Rep

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We numerically demonstrate the generation of intense, low-divergence soft X-ray isolated attosecond pulses in a gas-filled hollow waveguide using synthesized few-cycle two-color laser waveforms. The waveform is a superposition of a fundamental and its second harmonic optimized such that highest harmonic yields are emitted from each atom. We then optimize the gas pressure and the length and radius of the waveguide such that bright coherent high-order harmonics with angular divergence smaller than 1 mrad are generated, for photon energy from the extreme ultraviolet to soft X-rays. By selecting a proper spectral range enhanced isolated attosecond pulses are generated. We study how dynamic phase matching caused by the interplay among waveguide mode, neutral atomic dispersion, and plasma effect is achieved at the optimal macroscopic conditions, by performing time-frequency analysis and by analyzing the evolution of the driving laser’s electric field during the propagation. Our results, when combined with the on-going push of high-repetition-rate lasers (sub- to few MHz’s) may eventually lead to the generation of high-flux, low-divergence soft X-ray tabletop isolated attosecond pulses for applications.

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“…Note that the minus sign before in Eq. (10) is different from that in refs 67 and 68 because of the different convention for the Fourier transform.…”

Section: Methodsmentioning

confidence: 81%

“…In order to impose the boundary conditions of the hollow waveguide, is written as a superposition of eigenmodes666768:…”

Section: Methodsmentioning

confidence: 99%

Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses

Jin

Hong

Lin

2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The wave equation for pulse propagation is solved using the split operator method [28] in which one advances the solution from z to z + dz in two steps, a first linear (diffraction) part corresponding to the homogeneous wave equation, and a second nonlinear one in which dispersion, ionization, and Kerr contributions are included. In the first step we write the electric field in frequency domain as a superposition of the hybrid EH 1m eigenmodes and advance the solution in the moving frame by calculating the new coefficients in z + dz using the the coefficients in z and the propagation constants for the EH 1m eigenmodes in the circular hollow core fiber.…”

Section: Resultsmentioning

confidence: 99%

High-order harmonic generation in a microfluidic glass device

et al. 2020

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We report on the efficient generation of high-order harmonics in helium gas inside complex glass micro-devices fabricated by femtosecond laser micromachining. By exploiting the three-dimensional capabilities and extreme flexibility of this fabrication technique we developed fluidic micro-structures in a fused-silica substrate that allowed us to achieve accurate control of the gas density inside a micrometer-sized microchannel. As a result, we achieved a broadband spectrum of extreme ultraviolet (XUV) radiation which extends up to 200 eV and we observed a considerable increase in the harmonics generation efficiency if compared with traditional harmonic generation in gas jets. We foresee that the application of femosecond-laser-micromachined glass devices to high-order harmonics generation can be extended to more complex on-chip systems including different functionalities, thus opening the possibility to future miniaturization of XUV and Attosecond beamlines.

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“…1(a), (b) is reproduced with permission from Akira Suda (Samuel et al, 1996)). Then they used the same parameters as those used in the experiments to make simulations for these broadenings based on a method described elsewhere (Nurhuda et al, 2003) in order to understand the mechanism driving the spectral broadening as shown in fig.1 (b). A good agreement was found between the experimental and the theoretical simulations.…”

Section: Supercontinuum Generation In Hollow Fibersmentioning

confidence: 99%

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

Tawfik¹,

An²,

Kim³

2012

Selected Topics on Optical Fiber Technology

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Propagation dynamics of femtosecond laser pulses in a hollow fiber filled with argon: constant gas pressure versus differential gas pressure

Cited by 65 publications

References 10 publications

Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses

Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses

High-order harmonic generation in a microfluidic glass device

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

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