Generation of subterawatt-attosecond pulses in a soft x-ray free-electron laser

Huang, Senlin; Ding, Yuantao; Huang, Zhirong; Marcus, Gabriel

doi:10.1103/physrevaccelbeams.19.080702

Cited by 19 publications

(15 citation statements)

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“…X-ray free-electron (XFEL) sources [1,2] provide x-ray pulses of femtosecond and potentially attosecond duration [3] of unprecedented high intensities [4] and could become game changers for x-ray spectroscopy applications. Current experiments are using primarily the linear interaction of matter with the x-ray pulses taking advantage of their ultrashort duration [5,6].…”

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confidence: 99%

Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes

et al. 2018

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We report the observation and analysis of the gain curve of amplified Kα x-ray emission from solutions of Mn(II) and Mn(VII) complexes using an x-ray free electron laser to create the 1s core-hole population inversion. We find spectra at amplification levels extending over 4 orders of magnitude until saturation. We observe bandwidths below the Mn 1s core-hole lifetime broadening in the onset of the stimulated emission. In the exponential amplification regime the resolution corrected spectral width of ~1.7 eV FWHM is constant over 3 orders of magnitude, pointing to the buildup of transform limited pulses of ~1 fs duration. Driving the amplification into saturation leads to broadening and a shift of the line. Importantly, the chemical sensitivity of the stimulated x-ray emission to the Mn oxidation state is preserved at power densities of ~1020 W/cm2 for the incoming x-ray pulses. Differences in signal sensitivity and spectral information compared to conventional (spontaneous) x-ray emission spectroscopy are discussed. Our findings build a baseline for nonlinear x-ray spectroscopy for a wide range of transition metal complexes in inorganic chemistry, catalysis, and materials science.

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confidence: 99%

Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes

et al. 2018

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“…However to produce a reliable rate of single coherent spectral spikes, the operating point should be kept before saturation thereby limiting the achievable power. Several schemes have been proposed to produce high power ultra-short soft X-rays [44][45][46][47][48][49][50]. Particularly, a multi-stage scheme capable of generating terawatt few-femtosecond pulses has been proposed [47] by using Fresh-slice amplification in ten cascaded stages.…”

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High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

et al. 2018

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We demonstrate a novel multistage amplification scheme for self-amplified spontaneous-emission free electron lasers for the production of few femtosecond pulses with very high power in the soft x-ray regime. The scheme uses the fresh-slice technique to produce an x-ray pulse on the bunch tail, subsequently amplified in downstream undulator sections by fresh electrons. With three-stages amplification, x-ray pulses with an energy of hundreds of microjoules are produced in few femtoseconds. For single-spike spectra x-ray pulses the pulse power is increased more than an order of magnitude compared to other techniques in the same wavelength range.

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“…The latter is commonly used to describe properties of FEL radiation (Wu et al, 2007;Allaria et al, 2010;Marcus et al, 2014;Huang et al, 2016;Serkez, 2016). The spectrogram of a signal f (t) can be expressed through the two-dimensional convolution of the Wigner distribution of that signal W f and the Wigner distribution W h of the spectrogram window function h(t),…”

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Wigner distribution of self-amplified spontaneous emission free-electron laser pulses and extracting its autocorrelation

Serkez¹,

Gorobtsov²,

Rivas³

et al. 2021

J Synchrotron Radiat

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The emerging concept of `beam by design' in free-electron laser (FEL) accelerator physics aims for accurate manipulation of the electron beam to tailor spectral and temporal properties of the radiation for specific experimental purposes, such as X-ray pump/X-ray probe and multiple wavelength experiments. `Beam by design' requires fast, efficient, and detailed feedback on the spectral and temporal properties of the generated X-ray radiation. Here a simple and cost-efficient method to extract information on the longitudinal Wigner distribution function of emitted FEL pulses is proposed. The method requires only an ensemble of measured FEL spectra and is rather robust with respect to accelerator fluctuations. The method is applied to both the simulated SASE spectra with known radiation properties as well as to the SASE spectra measured at the European XFEL revealing underlying non-linear chirp of the generated radiation. In the Appendices an intuitive understanding of time–frequency representations of chirped SASE radiation is provided.

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Generation of subterawatt-attosecond pulses in a soft x-ray free-electron laser

Cited by 19 publications

References 50 publications

Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes

Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes

High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

Wigner distribution of self-amplified spontaneous emission free-electron laser pulses and extracting its autocorrelation

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