Bright, high-repetition-rate water window soft X-ray source enabled by nonlinear pulse self-compression in an antiresonant hollow-core fibre

Gebhardt, Martin; Heuermann, Tobias; Klas, Robert; Liu, C.; Kirsche, Alexander; Lenski, Mathias; Wang, Z.; Gaida, Christian; Antonio-López, Jose Enrique; Schülzgen, Axel; Amezcua‐Correa, Rodrigo; Rothhardt, Jan; Limpert, Jens

doi:10.1038/s41377-021-00477-x

Cited by 43 publications

(16 citation statements)

References 37 publications

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“…In fig. S12, we summarize the results of E 1% observed in the previous experiments driven by few-cycle pulses with different λ L (14,28,29,31,34,41,(49)(50)(51) and compare them with the NCIF model. We find that, for λ L in the near-infrared region (800 and 1030 nm), the experimental E 1% agrees very well with the NCIF model, while, for the mid-infrared wavelengths (λ L > 1500 nm), the results are in better agreement with E sat PMC of the model.…”

Section: Discussionmentioning

confidence: 99%

Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching

Chen

Peng

et al. 2022

Sci. Adv.

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The concept of critical ionization fraction has been essential for high-harmonic generation, because it dictates the maximum driving laser intensity while preserving the phase matching of harmonics. In this work, we reveal a second, nonadiabatic critical ionization fraction, which substantially extends the phase-matched harmonic energy, arising because of the strong reshaping of the intense laser field in a gas plasma. We validate this understanding through a systematic comparison between experiment and theory for a wide range of laser conditions. In particular, the properties of the high-harmonic spectrum versus the laser intensity undergoes three distinctive scenarios: (i) coincidence with the single-atom cutoff, (ii) strong spectral extension, and (iii) spectral energy saturation. We present an analytical model that predicts the spectral extension and reveals the increasing importance of the nonadiabatic effects for mid-infrared lasers. These findings are important for the development of high-brightness soft x-ray sources for applications in spectroscopy and imaging.

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Section: Discussionmentioning

confidence: 99%

Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching

Chen

Peng

et al. 2022

Sci. Adv.

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“…On the other hand, the capillary waveguide can extend an interaction length. At the same time, gas density distribution along the propagation direction is not homogeneous 44 . Thus, the static gas cell is widely adopted for loose-focusing geometry.…”

Section: B Double-structured Gas Cell With 10 Hz Operationmentioning

confidence: 98%

“…Optical parametric amplification (OPA) lasers are capable of generating longer wavelengths compared to Ti:sapphire counterparts. Many groups capitalized on this advantage and generated HHs in the water window region [12][13][14][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] and used them for various applications [45][46][47] . At the same time, OPA lasers have several drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Apparatus for generation of nanojoule-class water-window high-order harmonics

Nishimura,

Fu,

Suda

et al. 2020

Preprint

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In our recent study [Y. Fu et al., Commun. Phys. 3, 92 (2020)], we have developed an approach for energy-scaling of high-order harmonic generation in water-window region under neutral-medium condition. More specifically, we obtained nanojoule-class water-window soft x-ray harmonic beam under phase match condition. It has been achieved by combining a newly developed terawatt-class mid-infrared femtosecond laser and a loose focusing geometry for high-order harmonic generation. The generated beam is more than 100 times intense compared to previously reported results. The experimental setup included two key parts: terawatt mid-infrared femtosecond driving laser [Y. Fu et al., Sci. Rep. 8, 7692 (2018)] and specially designed gas cell. Despite the dramatic drop in the optimal gas pressure due to loose focusing geometry, it still reached 1 bar level for helium. Moreover, faster leaking speed caused by larger pinhole size of the gas cell made the use of a normal gas cell impossible. Thus, we have designed a double-structured pulsed-gas cell with a differential pumping system, which enabled providing sufficiently high gas pressure. Moreover, it allowed reducing gas consumption significantly. Robust energy-scalable apparatus for high-order harmonic generation developed in in this study will enable the generation of over tens nanojoule water-window attosecond pulses in the nearest future.

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“…It is worth mentioning that, with the latest advances in high power thulium fiber CPAs with a central wavelength around 2 µm, many of the results at 1 µm are being extended to the mid-IR [110,111]. In fact, Gebhardt et al have recently implemented nonlinear pulse self-compression and soft-X ray generation in a single antiresonant hollow-core fiber from a 2 µm fiber CPA at 100 kHz [112].…”

Section: Post-compression Of High Power Cpasmentioning

confidence: 99%

High power, high repetition rate laser-based sources for attosecond science

Furch¹,

Witting²,

Osolodkov³

et al. 2022

J. Phys. Photonics

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Within the last two decades attosecond science has been established as a novel research ﬁeld providing insights into the ultrafast electron dynamics that follows a photoexcitation or photoionization process. Enabled by technological advances in ultrafast laser ampliﬁers, attosecond science has been in turn, a powerful engine driving the development of novel sources of intense ultrafast laser pulses. This article focuses on the development of high repetition rate laser-based sources delivering high energy pulses with a duration of only a few optical cycles, for applications in attosecond science. In particular, a high power, high repetition rate optical parametric chirped pulse ampliﬁcation system is described, which was developed to drive an attosecond pump-probe beamline targeting photoionization experiments with electron-ion coincidence detection at high acquisition rates.

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Bright, high-repetition-rate water window soft X-ray source enabled by nonlinear pulse self-compression in an antiresonant hollow-core fibre

Cited by 43 publications

References 37 publications

Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching

Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching

Apparatus for generation of nanojoule-class water-window high-order harmonics

High power, high repetition rate laser-based sources for attosecond science

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