Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He

Moshammer, R.; Pfeifer, Thomas; Rudenko, Artem; Jiang, Yuhai; Foucar, L.; Курка, М.; Kühnel, K. U.; Schröter, C. D.; Ullrich, J.; Herrwerth, Oliver; Kling, Matthias F.; Liu, X. J.; Motomura, K.; Fukuzawa, H.; Yamada, Akifumi; Ueda, Kiyoshi; Ishikawa, Kenichi L.; Nagaya, K.; Iwayama, H.; Sugishima, A.; Mizoguchi, Y.; Yase, S.; Yao, Makoto; Saito, Nariyuki; Belkacem, A.; Nagasono, Mitsuru; Higashiya, A.; Yabashi, Makina; Ishikawa, Tetsuya; Ohashi, Haruhiko; Kimura, Hiroaki; Togashi, Tadashi

doi:10.1364/oe.19.021698

Cited by 64 publications

(49 citation statements)

References 20 publications

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“…Photoelectron angular distribution is nowadays extensively studied by the velocity map imaging technique (see e.g., [29,30]). These new light sources have also enabled two-photon ionization (2PI) of species with a deep ionization potential such as He [31][32][33][34][35] and N 2 [36].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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We theoretically study the photoelectron angular distribution (PAD) from the two-photon single ionization of H and He by femtosecond and attosecond extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schrödinger equation. The PAD is formed by the interference of the s and d continuum wave packets, and, thus, contains the information on the relative phase δ and amplitude ratio between them. We find that, when a spectrally broadened femtosecond pulse is resonant with an excited level, the PAD substantially changes with pulse width, since the competition between resonant and nonresonant ionization paths, leading to δ distinct from the scattering phase shift difference, changes with it. In contrast, when the Rydberg manifold is excited, and for the case of above-threshold two-photon ionization, δ and the PAD do not depend much on pulse width, except for the attosecond region. Thus, the Rydberg manifold and the continuum behave similarly in this respect. For a high-harmonic pulse composed of multiple harmonic orders, while the value of δ is different from that for a single-component pulse, the PAD still rapidly varies with pulse width. The present results illustrate a new way to tailor the continuum wave packet.

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Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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“…This FEL light source provided EUV pulses with a duration of ∼ 30 fs [26] and a fullwidth-at-half-maximum spectral width of ∼ 0.2 eV [36]. The photon energies were selected to be 20.3 eV, 21.3 eV , 23.0 eV, and 24.3 eV.…”

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confidence: 99%

“…We have employed chaotic pulses with a mean intensity of 2.5 × 10 13 W/cm 2 , generated by the partial-coherence method described in Ref. [46], for a coherence time of 8 fs and a mean pulse width of 28 fs (full width at half maximum), as recently measured by second-order autocorrelation [26], both assumed to have Gaussian profiles on average. One can see a good agreement between the experimental and simulation results in Fig.…”

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confidence: 99%

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

Motomura

Ishikawa

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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Phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets generated by two-photon ionization of helium atoms are determined from the photoelectron angular distributions obtained using velocity map imaging. Helium atoms are ionized with ultrashort extreme-ultraviolet free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3 eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to an excited level or Rydberg manifold. The difference stems from the competition between resonant and non-resonant paths in two-photon ionization by ultrashort pulses. Since the competition can be controlled in principle by the pulse shape, the present results illustrate a new way to tailor the continuum wave packet.

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“…Fresnel's double mirror and Lloyd's mirror (Rus et al, 2001;Rocca et al, 1999), edge mirror splitting (Mitzner et al, 2008(Mitzner et al, , 2009Schlotter et al, 2010;Roling et al, 2011Roling et al, , 2012, half-splitted mirror (Moshammer et al, 2011)] and amplitude splitting [e.g. diffraction gratings (Goulielmakis et al, 2002) or semitransparent membranes].…”

Section: Introductionmentioning

confidence: 99%

Mo/Si multilayer-coated amplitude-division beam splitters for XUV radiation sources

Sobierajski

Loch

Kruijs

et al. 2013

J Synchrotron Radiat

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Amplitude-division beam splitters for XUV radiation sources have been developed and extensively characterized. Mo/Si multilayer coatings were deposited on 50 nm-thick SiN membranes. By changing the multilayer structure (periodicity, number of bilayers, etc.) the intensity of the reflected and transmitted beams were optimized for selected incident radiation parameters (wavelength, incident angle). The developed optical elements were characterized by means of XUV reflectometry and transmission measurements, atomic force microscopy and optical interferometry. Special attention was paid to the spatial homogeneity of the optical response and reflected beam wavefront distortions. Here the results of the characterization are presented and improvements required for advanced applications at XUV free-electron lasers are identified. A flatness as low as 4 nm r.m.s. on 3 Â 3 mm beam splitters and 22 nm r.m.s. on 10 Â 10 mm beam splitters has been obtained. The high-spatialfrequency surface roughness was about 0.7-1 nm r.m.s. The middle-spatialfrequency roughness was in the range 0.2-0.8 nm r.m.s. The reflection and transmission of the beam splitters were found to be very homogeneous, with a deviation of less than 2% across the full optical element.

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Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He

Cited by 64 publications

References 20 publications

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

Mo/Si multilayer-coated amplitude-division beam splitters for XUV radiation sources

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