Coherent phase-matched VUV generation by field-controlled bound states

Chini, Michael; Wang, Xiaowei; Yan, Chao; Wang, He; Wu, Yi; Cunningham, Eric; Li, Peng-Cheng; Heslar, John; Telnov, Dmitry A.; Chu, Shih‐I; Chang, Zenghu

doi:10.1038/nphoton.2014.83

Cited by 109 publications

(79 citation statements)

References 30 publications

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“…With the development of laser technique, the dynamics of atoms and molecules have been a hot topic in recent years, which has attracted both practical and fundamental interest [1][2][3]. In particular, high-order harmonic generation (HHG), which occurs during the process of laser pulses interaction with atoms or molecules, has been studied for more than two decades [4][5][6].…”

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confidence: 99%

Comparison of high harmonic generation and attosecond pulse from 3D hydrogen atom in three kinds of inhomogeneous fields

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Comparison of high harmonic generation and attosecond pulse from 3D hydrogen atom in three kinds of inhomogeneous fields

et al. 2016

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“…To overcome these limitations, and to extend the attosecond science experimental possibilities, there is a considerable interest in developing high power attosecond sources both at higher 12 or lower [13][14][15][16][17][18] energies with respect to the standard XUV region. For lower photon energies, in the range 4-7 eV, low order nonlinear optical processes have been used to generate pulses in the range of 3-18 fs [14][15][16]19 , but sub-femtosecond duration have not yet been attained.…”

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confidence: 99%

“…For lower photon energies, in the range 4-7 eV, low order nonlinear optical processes have been used to generate pulses in the range of 3-18 fs [14][15][16]19 , but sub-femtosecond duration have not yet been attained. HHG offers a promising route to attosecond VUV pulses 13,17 . HHG has been successfully exploited 13,20 to generate sub femtosecond pulses with photon energies in the range 20-40 eV using polarisation gating.…”

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Synchronized pulses generated at 20 eV and 90 eV for attosecond pump–probe experiments

et al. 2015

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The development of attosecond pulses across different photon energies is an essential precursor to performing pump-probe attosecond experiments in complex systems, where the potential of attosecond science 1 can be further developed 2,3 . We report the generation and characterization of synchronised XUV (90 eV) and VUV (20 eV) pulses generated simultaneously via high harmonic generation. The VUV pulses are well suited for pump-probe experiments that exploit the high photoionisation cross-section of many molecules in this spectral region 4 , and the higher photon flux due to the higher conversion efficiency of the high harmonics generation process at these energies 5 . We temporally characterised all pulses using the attosecond streaking technique 6 and the FROG-CRAB retrieval method 7 . We report 57616 as pulses at 20 eV and 25721 as pulses at 90 eV. Our demonstration of synchronised attosecond pulses at different photon energies, and inherently jitter-free due to the common-path geometry implemented, offers unprecedented possibilities for pump-probe studies.The production of isolated attosecond pulses (IAP) in the extreme ultraviolet (XUV) region (30-150 eV) with an intense near-infrared (NIR) femtosecond laser is nowadays a robust process. The generation of IAP via high harmonic generation 1 (HHG) requires temporally gating the high harmonics emission to a single burst by using one of several techniques. Most common are polarization gating 8 , double optical gating 9 , ionization gating 10 and amplitude gating 11 . However, the

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“…We identify the optimal conditions for generating best-quality harmonics and uncover the underlying mechanism of dynamic phase matching. We show that the best phase-matched harmonics from the extreme ultraviolet (XUV) to soft x rays have low divergences (smaller than 1 mrad), which can be compared to vacuum ultraviolet (VUV) or XUV harmonics generated by traditional 800-nm lasers [31][32][33][34][35][36]. In comparison, soft x-ray harmonics generated with a midinfrared laser alone reported the full divergence angle of about 7 mrad [37] or 4 to 8 mrad [38] (half divergence angle should be compared to 1 mrad).…”

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Generation of Bright, Spatially Coherent Soft X-Ray High Harmonics in a Hollow Waveguide Using Two-Color Synthesized Laser Pulses

et al. 2015

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We investigate the efficient generation of low-divergence high-order harmonics driven by waveformoptimized laser pulses in a gas-filled hollow waveguide. The drive waveform is obtained by synthesizing two-color laser pulses, optimized such that highest harmonic yields are emitted from each atom. Optimization of the gas pressure and waveguide configuration has enabled us to produce bright and spatially coherent harmonics extending from the extreme ultraviolet to soft x rays. Our study on the interplay among waveguide mode, atomic dispersion, and plasma effect uncovers how dynamic phase matching is accomplished and how an optimized waveform is maintained when optimal waveguide parameters (radius and length) and gas pressure are identified. Our analysis should help laboratory development in the generation of high-flux bright coherent soft x rays as tabletop light sources for applications.

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Coherent phase-matched VUV generation by field-controlled bound states

Cited by 109 publications

References 30 publications

Comparison of high harmonic generation and attosecond pulse from 3D hydrogen atom in three kinds of inhomogeneous fields

Comparison of high harmonic generation and attosecond pulse from 3D hydrogen atom in three kinds of inhomogeneous fields

Synchronized pulses generated at 20 eV and 90 eV for attosecond pump–probe experiments

Generation of Bright, Spatially Coherent Soft X-Ray High Harmonics in a Hollow Waveguide Using Two-Color Synthesized Laser Pulses

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