7th International Conference on Attosecond Science and Technology

Session

Poster session 1

1 Jul 2019, 18:15

University of Szeged Congress Centre

Description

Monday poster session

97. 1.4 mJ Supercontinuum Generation in Solid Thin Plates

Mr Siyuan Xu (Xidian University)

01/07/2019, 18:15

poster

A supercontinuum covering 480 to 930 nm was generated in seven thin fused silica plates with energy of 1.4 mJ at 1 kHz repetition rate, and the efficiency was close to 80%, supporting a sub-10-fs pulse duration.

87. A Beamline combining XUV Attosecond Pulses with sub-2 fs Deep-UV Pulses

Vincent Wanie (Center for Free-Electron Laser Science, DESY)

01/07/2019, 18:15

poster

1.9-fs deep ultraviolet pulses (150 nJ) are obtained from third-harmonic generation in argon using a laser micromachined gas cell. The source is synchronized with isolated attosecond XUV pulses offering new avenues in attosecond spectroscopy of bio-relevant molecules.

85. A Direct Approach to Probe Tunneling Time

Dr MingHu Yuan (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

An approach is presented to directly probe the tunneling time, where the influence of Coulomb potential is avoided. A positive tunneling time is extracted, which is almost not influenced by the laser intensity in some range.

40. A Quantum Concept of Attosecond Radiation

Prof. Sandor Varro (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

It has been shown that symmetric entangled coherent states of a many-mode optical radiation always result in completely locked Fourier superpositions for the expectation value of the electric field operator. Accordingly, in case of such entangled states, even an occasionally random distribution of the phases of the complex amplitudes cannot spoil the locking of the temporal Fourier components....

73. Above Threshold Ionization Features Driven by Few Cycles Bounded Inhomogeneous Electric Field

Mr Pedro Rueda (Centro de Investigaciones Ópticas-CONICET-CIC-UNLP)

01/07/2019, 18:15

poster

This works describes in detail the main photoelectron spectra features after excitation with several driven wavelengths under inhomegenous field conditions. Quantum and classical simulations are in good agreement showing an important cut-off enlargement and high photoelectrons yield.

27. Alpha Decay in Intense Laser Fields

Prof. Xu Wang (Graduate School, China Academy of Engineering Physics)

01/07/2019, 18:15

poster

We calculate the effect of intense laser fields on nuclear alpha decay process, using realistic and quantitative nuclear potentials. We show that alpha decay rates can indeed be modified by strong laser fields to some finite extent. We also predict that alpha decays with lower decay energies are relatively easier to be modified than those with higher decay energies, due to longer tunneling...

141. Anisotropic High-harmonic Generation of MgO

Mr Liang Li (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

We investigate the anisotropic high-harmonic generation with laser fields from linear to circular polarization. To reveal the underlying microscopic dynamic, a real-space trajectory method with atom resolution is proposed.

142. Atomic and Molecular Suite of R-matrix Codes for Ultrafast Dynamics in Strong Laser Fields and Electron/Positron Scattering

Dr Zdenek Masin (Charles University)

01/07/2019, 18:15

poster

We describe and illustrate a number of recent developments of the atomic and molecular ab initio R-matrix suites for both time-dependent calculations of ultrafast laser-induced dynamics and time-independent calculations of photoionization and electron scattering.

43. Attosecond Correlation with Actively Stabilized Extreme Ultraviolet Interferometer

Hiroki Mashiko (NTT Basic Research Laboratories)

01/07/2019, 18:15

poster

We developed an actively stabilized extreme ultraviolet (XUV) interferometer (stability: 7.8-as RMS over 12 hours) and thereby demonstrated the interferometric 1st-order autocorrelation of an isolated attosecond pulse with 100-as periodicity in the XUV region.

115. Attosecond Electron Localization in Metallic titanium

Mikhail Volkov (LMU Munich)

01/07/2019, 18:15

poster

We investigate attosecond electron dynamics in metals with transient absorption spectroscopy supported by ab-initio calculations. We find that optical excitation of metallic titanium leads to an ultrafast electron localization and modifies electronic screening.

139. Attosecond Metrology Using Two-photon Resonant Raman-type Transitions

Valeryia Birulia (Moscow Institute of Physics and Technology)

01/07/2019, 18:15

poster

We suggest a new method of the attosecond pulse characterization using two-photon resonant Raman-type transitions via continuum. Similar technique can be used for measurement of the Wigner time delay for the Raman transitions.

99. Attosecond Photocarrier Excitation in III-V Semiconductors

Mr Fabian Schlaepfer (ETH Zurich)

01/07/2019, 18:15

poster

Using transient absorption spectroscopy, we investigate laser-induced attosecond electron dynamics in III-V semiconductors. We find a complex interplay between intra- and inter-band transitions in the transient response. Our findings are supported by ab-initio calculations.

8. Attosecond Photoelectron Holography in Strong Field Tunneling Ionization

Dr Yueming Zhou (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

Tunneling ionization of atoms or molecules by a strong laser field generates an electron wavepacket. This electron wavepacket could reach the detector directly or undergoes rescattering by the parent ion, giving rising to the interference in the photoelectron momentum distribution (PEMD), referred as photoelectron holography in strong field tunneling ionization. We will first show how the...

108. Attosecond Pulse Train Generated with Short Pulses Compressed by Thin Plates

Ms Yujiao Jiang (Xidian University)

01/07/2019, 18:15

poster

We used fused silica thin plates to broaden the spectrum of femtosecond pulses. After careful group delay compensation, the 10 fs, 800 nm pulse was focused on Ar, and a train of 308 as pulses was detected.

18. Attosecond Time Delay in Photoionization of Noble-Gas and Halogen Atoms

Dr Liangwen Pi (Max-Planck-Institut für Physik Komplexer Systeme)

01/07/2019, 18:15

poster

We calculate photoionization cross section, asymmetry parameter and Wigner time delay for noble-gas and halogen atoms. We find that halogen atoms bear a strong resemblance to their noble-gas neighbors.

88. Attosecond Time Delays in Photoionisation of Noble Gas Atoms and Small Symmetric Molecules

Mr Matteo Moioli (University of Freiburg)

01/07/2019, 18:15

poster

Trains of attosecond pulses are suitable tools to unveil the ultrafast dynamics of electrons. Here we report the results of photoionization time delays in atoms and small molecules resolved over angle and energy of emission.

17. Autoionizing Rydberg States of H$_2$ Molecules in Strong Laser Field

Dr Yonghao Mi (National Research Council of Canada)

01/07/2019, 18:15

poster

Channel resolved electron emission from strong-field photoionization of H$_{2}$ molecules were measured using ultrashort laser pulses and a reaction microscope. An enhancement of the photoelectron yield in the low-energy region was observed for the case of bound ionization. This enhancement is understood as the population of autoionizing Rydberg states in the neutral molecule and subsequent...

59. Broadband Terahertz Generation in Organic Crystals by Optical Rectification of Intense Mid-Infrared Pulses

Claudia Gollner (TU Wien)

01/07/2019, 18:15

poster

We demonstrate broadband THz generation in organic crystals driven by mid-IR $3.9\,\mathrm{\mu m}$ pulses. Due to the suppression of multi-photon absorption, we record an order of magnitude increase in the damage and optical to THz conversion saturation thresholds as compared to conventional near-IR pump schemes.

135. Carrier-envelope-phase Stabilized KLM Yb:CYA Laser with Feed-forward Scheme

Ziyue Zhang (Institute of Physics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We report a carrier-envelope phase stabilized kerr-lens mode locking (KLM) Yb:CYA laser with feed-forward methods. Signal-to-noise (SNR) of the out-of-loop carrier-envelope-offset (CEO) was measured to be 38 dB. Timing jitter of the stabilized CEO was 44 as.

31. CEP-controlled Non-adiabatic Transitions Visualized by Photoelectron Spectroscopy and Attosecond Transient Absorption Spectroscopy in LiH

Stephan van den Wildenberg (University of Liege)

01/07/2019, 18:15

poster

We steer the LiH molecule towards a target dissociation channel by using few cycle CEP stabilized IR pulses and follow the dynamics using both time-resolved photoelectron spectroscopy and attosecond transient absorption spectroscopy.

79. Characterisation and Modelling of Ultrashort Laser-Driven Electromagnetic Pulses

Kwinten Nelissen (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

We will demonstrate based on experimental results a direct correlation between measured EMP energy and the laser parameters such as laser energy and intensity. Finally numerical Finite Element Method simulations are performed of the laser target holder system showing good agreement with the experimental obtained results.

76. Charge Migration In Propiolic Acid And Its Dephasing By The Coupling To The Nuclear Motion

Dr Victor Despré (Universität Heidelberg)

01/07/2019, 18:15

poster

Using ab initio methods we identified a molecule in which charge migration dynamics survive long enough the dephasing by the nuclear motion to be observed and controlled. This represents an important step in the direction of accomplishing the dream of attochemistry.

124. Charges Displaced by Short Laser Pulses in Solids

István Magashegyi (University of Szeged)

01/07/2019, 18:15

poster

Charges displaced by a laser pulse in solids can be useful for detection purposes. Our analytical approach reduces the computational costs, and give us an e?cient tool to investigate this phenomenon.

131. Coherence of Hole States in Attosecond Photoionization

Mr Takuma Teramura (The University of Tokyo)

01/07/2019, 18:15

poster

We study coherent hole dynamics triggered by attosecond laser pulse within the time-dependent multiconfiguration self-consistent field method. To evaluate coherence from the total wavefunction, we propose a new position-based reduced ionic density matrix.

96. Coherence Property Comparison of Spectral Broadening Methods in CEP Stabilization

Mr Yitan Gao (Institute of Physics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We measured and stabilized the carrier-envelope phase by f-2f spectral interferometry with supercontinuum generated by sapphire bulk plate, hollow-core fiber and fused silica thin plates and calculated the coherence properties for each method theoretically.

140. Coherence Transfer from Ultrastable Optical Frequency Comb to CW Laser with Feed-forward Method

Xiaodong Shao (Institute of Physics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We report a precision feed-forward locking between a 1064 nm continuous wave (CW) and an ultrastable optical frequency comb. The relative linewidth of the 1064 nm CW laser is narrowed to 1.14 mHz and the stability reaches 1.5×10$^{-17}$ at 1 s at the optical wavelength of 1064 nm.

132. Coherent Multichannel Dynamics of Aligned Molecules Resolved by Two Dimensional High-harmonic and Terahertz Spectroscopy

Dr Xiaowei Wang (National University of Defense Technology)

01/07/2019, 18:15

poster

We combine the simultaneous measurement of terahertz wave and high harmonic emission to resolve the coherent multichannel electron dynamics of aligned CO$_{2}$ molecules driven by two-color laser field. It provides a new tool for detecting and resolving these multi-electron phenomena.

80. Combining Attosecond XUV Pulses with Recoil-ion Momentum Spectroscopy

Prof. Jianmin Yuan (National University of Defense Technology)

01/07/2019, 18:15

poster

We successfully combined an attosecond XUV pulse and a recoil-ion momentum spectroscopy into our home-built setup. The setup can complete the XUV-infrared pump-probe experiments, which provides attosecond pulse train and isolated attosecond pulse through high-order harmonic generation technology.

93. Conservation of Torus-Knot Angular Momentum in High-Harmonic Generation Driven by Fields with Spin-Orbit Mixing

Emilio Pisanty (ICFO)

01/07/2019, 18:15

poster

We show that high-harmonic generation conserves a nontrivial mixture of orbital and spin angular momentum, in which both the driving fields and the harmonic emission have novel field topologies and symmetries.

67. Control of Harmonic Generation by the Time Delay Between Two-Color, Bicircular Few-Cycle Mid-IR Laser Pulses

Mikhail Frolov (Voronezh State University)

01/07/2019, 18:15

poster

The control of high harmonic generation driven by time-delayed, few-cycle ω and 2ω counterrotating mid-IR pulses is analyzed. We show that the time delay between two pulses allows control yield and polarization properties of harmonics.

23. Decoding Molecular Rotational Dynamics from High-harmonic Generation

Dr Yanqing He (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

By exploiting machine learning in high-harmonic spectroscopy, we have reconstructed the molecular rotational dynamics with femtosecond resolution from the angular distributions of high-harmonics measured at various time delays of the probe pulse.

95. Determination of the Ionization Time Using Attosecond Photoelectron Interferometry

Dr Jia Tan (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

We propose a novel attosecond photoelectron interferometer, which is based on the interference of the direct and near-forward rescattering electron wave packets, to determine the time information characterizing the tunneling process.

63. Direct Numerical Observation of Real-Space Recollision in High-Harmonic Generation from Solids

Prof. Gopal Dixit (Indian Institute of Technology Bombay)

01/07/2019, 18:15

poster

Real-space picture of electron recollision with the parent ion guides our understanding of the highly nonlinear response of atoms and molecules to intense low-frequency laser fields. It is also among several leading contestants for the dominant mechanism of high harmonic generation (HHG) in solids, where it is typically viewed in the momentum space, as the recombination of the conduction band...

78. Double Ionization of Neon by Late Recollision Trajectories in Mid IR Wavelengths and the Role of the Magnetic Field

Prof. Camilo Ruiz (Universidad de Salamanca)

01/07/2019, 18:15

poster

Double ionization of Neon in mid IR wavelengths is investigated. A new set of late rescattering trajectories connected to a specific regions of the transversal momentum space are described and the effect of the magnetic field discussed.

116. Effect of Magnetic Field on Attosecond Photoelectron Spectroscopy by Time-of-flight Spectrometer with Magnetic Bottle

Dr Xianglin Wang (Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We construct the attosecond streak camera which adopts magnetic bottle time-of-flight spectrometer, and the flight tube of different lengths and diameters will be used to study photoelectron collection efficiency, noise and spectral resolution.

122. Electron wavepacket retrieval with Absolute Complex Dipole transition matrix element reConstruction (ACDC) algorithm

Mr Luca Pedrelli (ETH Zürich)

01/07/2019, 18:15

poster

We developed a new unprecedented accurate algorithm to reconstruct photoelectron wavepackets. It significantly improves prior methods to resolve attosecond time delays in photoemission. Preliminary analysis of experimental data shows excellent agreement with prior results.

11. Electrons with Equal Energy Emitting Back-to-back in Single Photon Double Ionization of Helium

Mr Sige Chen (Peking University)

01/07/2019, 18:15

poster

Single photon double ionization of helium at photon energies of 440 eV and 800 eV is numerically simulated beyond the dipole approximation. Distributions of ion momentum is in accordance with the experimental results. We also calculated the angular correlation spectrum in the coplanar geometer with equal energy sharing, in which interference between dipole and nondipole paths is included.

71. Enhancement of High-order Harmonic Generation with a Spatially and Transversely Inhomogeneous Field

Dr Meiyan Qin (Wuhan Institute of Technology)

01/07/2019, 18:15

poster

We designed a novel method to increase the high-order harmonic yield by introducing a spatial and transverse inhomogeneity into a mid-infrared laser field, which can be achieved by the illumination of plasmonic nanostructures with a short laser pulse.

72. First-principles Time- and Angle-resolved Photoelectron Spectroscopy

Mr Youngjae Kim (Department of Emerging Materials Science, DGIST)

01/07/2019, 18:15

poster

In this study, we will control the photoelectrons by introducing the excited Dirac cones, and show their flip-effects induced by IR (Infrared)-pump.

90. Generation of High Harmonics in Solids

Isabella Floss (Vienna University of Technology)

01/07/2019, 18:15

poster

Based on results of an ab-initio multi-scale simulation we present the build-up of high harmonics induced by strong and short laser pulses along the propagation direction inside a dielectric. We relate our findings to processes that need to be accounted for in realistic simulations.

16. Harmonic Generation in Solids Using a Near IR Driving Field

Mr Mukhtar Hussain (Universidade de Lisboa)

01/07/2019, 18:15

poster

In the present study, second harmonic generation (SHG) in thin ZnO crystal, pure MgO and Chromium (Cr) doped MgO crystals is investigated. We explore SHG dependence on the orientation angle between the crystal and laser polarization.

22. High Energy, Few-cycle Mid-infrared Laser Source Based on Coherent Beam Combining Using Hollow-core Fiber

Dr Qian Junyu (Shanghai Institute of Optics and Fine Mechanics, University of Chinese Academy of Science)

01/07/2019, 18:15

poster

We present a high energy, mid-infrared laser source based on coherent beam combining using hollow core fiber. Through coupling two 4 μm lasers generated by optical parametric chirped pulse amplification (OPCPA) into the hollow-core fiber (HCF), we obtained a laser with 2.25 mJ and 22.9 fs.

138. High Harmonic Generation in Gaseous Medium by Double-Pulse Forms

Lénárd Gulyás Oldal (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

Applying the double-pulse form to generate gas high-order harmonics, the appeared harmonics are narrower and more intense compared to the harmonics that generated by a regular Gaussian-shaped pulse. In this way, a practical method to generate intense, monochromatic pulses in the XUV region is proposed.

51. High Repetition Rate CEP-stable Yb-doped Amplifier for Attoscience

Mr Michele Natile (Amplitude Laser Group)

01/07/2019, 18:15

poster

We report on a CEP-stable YDFA delivering 30 µJ, 100 kHz, 100 fs pulses at 1030 nm. The integrated CEP noise in the bandwidth [1 Hz; 50 kHz] is 325 mrad.

111. High Repetition-rate, Two-cycle Driver for High-flux HHG

Michele Natile (Amplitude Laser, Business Unit Science), Florent Guichard (Amplitude Laser, Business Unit Science), Yoann Zaouter (Amplitude Laser, Business Unit Science), Marc Hanna (Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay)

01/07/2019, 18:15

poster

We demonstrate a hybrid dual-stage nonlinear compression scheme allowing to compress 330 fs-pulses generated from a high-energy ytterbium-doped fiber amplifier down to 6.8 fs pulse duration, with an overall transmission of 61%. This high transmission is obtained by using a first compression stage based on a gas-filled multipass cell, and a second stage based on a large-core gas-filled...

53. High-energy, Tunable Midinfrared to THz Laser Generated by Dual-chirped Difference Frequency Generation

Dr Yuxi Fu (RIKEN)

01/07/2019, 18:15

poster

We generate a tunable mid-infrared (3 μm) to THz (15 THz) laser using a dual-chirped difference frequency generation (DC-DFG) scheme, which is energy scalable to generate mJ-class THz pulses.

120. High-Harmonic Imaging of Spin-Polarised Defects in Solids

Mr Mrudul Muraleedharan Shylaja (Indian Institute of Technology Bombay)

01/07/2019, 18:15

poster

Here we employ time-dependent density-functional theory to investigate how the electron dynamics resulting in high-harmonic emission in monolayer hexagonal boron nitride is affected by the presence of point defects.

86. Holographic Schwinger Effect of Dynamic Fields

Dr Chen Lan (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

At strong coupling, the scalar Schwinger effect is studied by the field-theoretic method of worldline instantons for dynamic fields of single-pulse and sinusoidal types.

146. Improved Low Dimensional Modeling of Hydrogen and Helium Driven by a Strong Laser Pulse

Szilárd Majorosi (University of Szeged)

01/07/2019, 18:15

poster

We present our one dimensional models and simulation results of the hydrogen molecular ion and the helium atom that give strong field ionization dynamics quantitatively comparable to the true 3D case.

103. Ionization Dynamics Through Fano Resonances: Time-domain Interpretations of Spectral Amplitudes

Jérémie Caillat (LCPMR, Sorbonne Université)

01/07/2019, 18:15

poster

We investigate the possibilities to fully characterize the temporal profiles of photoemission processes, beyond the mere concept of delay, out of the associated complex spectral amplitudes.

19. Isolated Attosecond Pulses via Coherent Thomson-backscattering

Szabolcs Hack (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

Our theoretical and numerical results suggest that Thomson-backscattering of a NIR laser pulse on a suitable relativistic electron nanobunch creates an isolated XUV – soft X-ray pulse of ca. 20 asec length and uJ energy.

69. Isolated Terawatt Attosecond X-ray Free Electron Laser

Yong Woon Park (Pohang Accelerator Laboratory)

01/07/2019, 18:15

poster

Micro-bunching instability (MBI) is considered as a critical obstacle for the realization of the isolated terawatt attosecond XFEL. To make high a peak current, the distribution of the electron beam in the phase space should be uniform. The micro-bunching instability will twist the distribution which results in very low peak current value. The effect by MBI has been investigated and a proposal...

100. Isolated Waveform-Controlled Attosecond Pulse Generation by Undulator Radiation

Zoltán Tibai (University of Pécs)

01/07/2019, 18:15

poster

A linear accelerator based waveform-controlled single-cycle attosecond source is investigated numerically. Pulses with 170 nJ energy and 80 attosecond duration are predicted at 20 nm wavelength.

102. Laser Induced Distortion of Band Structure in Solids: an Analytic Model in Three Dimensions

Dr Imre Ferenc Barna (ELI-ALPS, ELI-HU Non-profit Ltd.)

01/07/2019, 18:15

poster

We consider a spatially periodic (cosine) potential as a model for a crystalline solid that interacts with a harmonically oscillating external electric field. This problem is periodic both in space and time and can be solved analytically using the Kramers-Henneberger co-moving frame. By analyzing the stability of the closely related Mathieu-type differential equation, the electronic band...

28. Longitudinal Momentum of the Electron at the Tunnelling Exit

Prof. Xu Wang (Graduate School, China Academy of Engineering Physics)

01/07/2019, 18:15

poster

The longitudinal tunnelling-exit momentum of the electron in strong-field tunnelling ionization is shown to be nonzero even in the static or the adiabatic limit. This nonzero momentum is a purely quantum mechanical effect determined by the shape of the wave function in the vicinity of the tunnelling-exit point. Nonadiabaticity or finite wavelength may increase this momentum substantially, and...

24. Michelson Interferometry of High-order Harmonic Generation in Solids

Mr Jin Jianzhao (Peking University), Hao Liang (Peking University), Liang-You Peng (Peking University)

01/07/2019, 18:15

poster

High-order harmonic generation in solids has attracted intensive investigations and many different features have been identified and interpreted. In this Letter, we find a distinct and clean interference pattern in the high-energy end of the spectrum by varying the maximum value of the vector potential of a driving pulse. This pattern can only be observed when the quasi-electron of the solid...

137. Microscopic Analysis of the Intensity and Wavelength Dependence of Quantum Path Interferences in High-order Harmonic Generation

Tamás Csizmadia (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

The complex behaviour of the harmonic yield radiated by a single noble gas atom via high-harmonic generation process is investigated as a function of the wavelength, as well as the peak intensity of the fundamental driving field.

126. Molecular Auger Interferometry

Margarita Khokhlova (Imperial College London)

01/07/2019, 18:15

poster

We propose a theory of interferometric measurement of a normal Auger decay width in molecules and show analytically that it can be reconstructed from the relative ($\omega/2\omega$) phase scan of the Auger yield modulation.

94. Momentum Spectroscopy of Cold Rubidium in the Femtosecond Laser Field

Dr Tian-Min Yan (Shanghai Advanced Research Institute, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We study photoionization of cold rubidium atoms in a strong infrared femtosecond laser field using a magneto-optical trap (MOT) recoil ion momentum spectrometer. The momentum distributions of Rb$^+$ created by absorption of two- or three-photon illuminate a dipole-like double-peak structure. The yielding momentum resolution of $0.12\pm0.03$ a.u. is achieved in comparison with calculations,...

98. Monitoring the Moving Electron Wavepacket with Near-forward Rescattering Photoelectron Holography

Mingrui He (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

By investigating the strong-field photoelectron holographic structure of the superposition state of the H_{2}^{+}, we find a bifurcation structure, from which the transient electron wave-packet can be read out.

10. Multichannel-resolved Dynamics in Below-threshold Harmonic Generation of Diatomic Molecules

Prof. Peng-Cheng Li (Shantou University)

01/07/2019, 18:15

poster

We present an ab initio quantum study of below-threshold harmonic generation (BTHG) from H$_2^+$ molecules in the presence of an intense laser field by solving the time-dependent Schrödinger equation accurately in space and time. We find that multiple channels contribute to BTHG of H$_2^+$ molecules, which are related to the electron driven initially at specific time of the laser pulse from...

52. Nanojoule Water Window Soft X-ray Harmonics Source

Dr Yuxi Fu (RIKEN)

01/07/2019, 18:15

poster

We obtain over 3.5 nJ water window soft x-rays by high-order harmonic generation (HHG), which is the strongest in ever reported results by HHG. X-ray absorption fine structure (XAFS) at Carbon k-edge is observed.

7. Nonlinear Laser Excitation of $^{229m}$Th Isomer State by Two-Color Femtosecond Laser Fields

Dr Sergey Stremoukhov (Lomonosov Moscow State University)

01/07/2019, 18:15

poster

It is shown that excitation of the isomeric nuclear state $^{229m}$Th in the process of thorium atom irradiation by two-color field of Ti:Sa can be enhanced significantly with respect to other nucleus excitation processes.

121. Optimizing High Harmonic Flux Using Artificial Neural Networks

Valer Tosa (INCDTIM Cluj Napoca)

01/07/2019, 18:15

poster

An artificial neural network that is able to predict the total harmonic flux in a given spectral range is developed. The accuracy of the model and its prediction capabilities are demonstrated.

68. Optimizing Soft X-Ray High Harmonic Generation

Mr Timur Avni (Imperial College London)

01/07/2019, 18:15

poster

We simulate high harmonic generation (HHG) from few-cycle mid-infrared (MIR) lasers. We calculate optimum phase matching parameters for attosecond pulses at important soft X-ray edges for low energy driving lasers (< 0.5 mJ).

41. Phase-matching-free Pulse Retrieval Based on Transient Absorption in Solids

Adrien Leblanc (INRS-EMT)

01/07/2019, 18:15

poster

We report a novel metrology tool to characterize femtosecond pulses. It is free of phase matching, enabling to measure pulses with ultra-broadband spectra and very low energy at the limit of the spectrometer detection.

106. Photo-induced Ultrafast Electron Emission and Photonic Bandgap Engineering in Phosphorene

Mr Saibabu Madas (ELI-ALPS, ELI-HU Non-Profit Ltd.)

01/07/2019, 18:15

poster

We show how the ultrafast photo-induced electron emission processes can reach the order of femtosecond timescale by suitable application of external ultrafast laser. Resulting evolution of the charge densities and emission currents are discussed. Our analysis is general and holds true for other class of two-dimensional materials as well.

143. Photoionization of H$_{2}$ Using the Molecular R-matrix with Time Approach

Zdenek Masin (Charles University)

01/07/2019, 18:15

poster

In this first application of our newly developed molecular time-dependent R-matrix method we study two- and four-photon ionization cross sections for H$_{2}$ and study the effects of electron correlation and choice of one electron basis.

75. Plasma Compensation of the Attosecond Chirp: The Macroscopic Case

Katalin Kovacs (INCDTIM Cluj Napoca), Dr Valer Tosa (INCDTIM Cluj Napoca)

01/07/2019, 18:15

poster

Chirp compensation of attosecond pulses by propagation in plasma after generation is numerically investigated. We analyze the contributions of plasma dispersion, spatial chirp, and propagation effects on the final pulse characteristics in experimentally feasible configurations.

44. Polarimetry of a Single-Order Circularly Polarized High Harmonic Separated by a Time-Delay Compensated Monochromator

Mr Kengo Ito (Hokkaido University), Taro Sekikawa (Hokkaido University)

01/07/2019, 18:15

poster

Polarization of single-order circularly polarized high harmonic is characterized after the separation by a time-delay compensated monochromator. The ellipticity introduced by the anisotropy of the toroidal gratings in diffraction is evaluated for the compensation.

92. Polarization Tagging of Two-photon Double Ionization by Elliptically Polarized XUV Pulses

Stefan Donsa (Vienna University of Technology)

01/07/2019, 18:15

poster

We explore the influence of elliptical polarization on the (non)sequential two-photon double ionization of atomic Helium with ultrashort extreme ultraviolet (XUV) light fields using time-dependent full ab initio simulations.

56. Potential Shape Dependent Interference Pattern in Photoelectron Spectra Near Cutoff

Mr Yang Hwan Kim (Center for Relativistic Laser Science, Institute for Basic Science, GIST)

01/07/2019, 18:15

poster

We show that the slope of a two-path interference pattern near the cutoff in above-threshold electron energy spectra obtained as a function of carrier-envelope phase is directly related to the shape of the atomic potential.

30. Probing Ultrafast Molecular Dynamics by Correlated Electron-Nuclear Momentum and Harmonic Spectra

Prof. Xue-Bin Bian (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

The molecular structure and ultrafast molecular processes can be decoded from the correlated electron-nuclear dynamics by measuring high-order harmonic generation and photoelectron momentum distributions. Subcycle time resolution can be achieved.

82. Progresses in Building a Femtosecond Extreme-ultraviolet (XUV) Comb at WIPM

Dr Linqiang Hua (Institute of Physics and Mathematics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

In this work, we report on the recent progresses in building an XUV comb at Wuhan Institute of Physics and Mathematics (WIPM).

66. Quantum Control and Ultrafast Charge Migration in Molecules in the X-ray Regime

Dr Solène Oberli (Universidad Autónoma de Madrid)

01/07/2019, 18:15

poster

In the present study, we focus on the ultrafast charge migration in the valence shell subsequent to Auger decay of a core-ionized/excited molecule. By using a two-color X-ray attosecond pump-probe scheme, we theoretically demonstrate that we can induce and measure charge migration at different sites of a molecule.

107. Quantum dynamics of the Isomerization of Norbornadiene to Quadricyclane Induced by Strong Attopulses.

Dr Alessio Valentini (University of Liege)

01/07/2019, 18:15

poster

We investigate the [2+2]photo-cycloaddition of norbornadiene to quadricyclane by integrating the nuclear time-dependent Schrödinger equation for eight electronic states, coupled by nonadiabatic coupling and the interaction with an external electric field.

42. Quasi-real-time Attosecond Streak Camera

Mr Peng Xu (Xi’an Institute of Optics and Precision Mechanics of CAS)

01/07/2019, 18:15

poster

A new attosecond streaking scheme using crossed XUV and IR beams and delay-line detector was proposed to largely shorten the experimental time to realize quasi real time characterization of attosecond pulses.

101. Reconstruction of Laser Pulses Measured Using a Tunneling Ionization Method

Prof. Kyung Taec Kim (IBS / GIST)

01/07/2019, 18:15

poster

We present a reconstruction algorithm for the temporal characterization method called as tunneling ionization with a perturbation for the time-domain observation of an electric-field (TIPTOE). The algorithm can be broadly applied for various laser pulses.

20. Relativistic Non-dipole Effects in Strong Field Ionization

Dr Igor Ivanov (Centre for Relativistic Laser Science, Institute for Basic Science), Prof. Kyung Taec Kim (Centre for Relativistic Laser Science, Institute for Basic Science)

01/07/2019, 18:15

poster

We present results of the theoretical and experimental study of the relativistic non-dipole effects in the strong field atomic ionization of Argon in the intensity range of $10^{14}$ -$10^{15}$ W/cm$^2$.

119. Revelation of Properties of the Plasmonic Field Using Bichromatic Circularly Polarized Laser Fields

Ms Irfana Neyaz Ansari (Indian Institute of Technology Bombay)

01/07/2019, 18:15

poster

Plasmonically enhanced field exhibits a great potential to extend the energy-cutoff of the high-order harmonic generation (HHG). In addition, in recent years, circularly polarized harmonics were generated using bichromatic circularly polarized laser fields. In this work, we combine the two approaches and study the HHG process driven by plasmonically enhanced bichromatic circularly polarized...

32. Role of Quantum-path Interference in High Harmonic Generation from Solids

Xue-Bin Bian (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)

01/07/2019, 18:15

poster

We introduced an intra- and intercycle interference model in the $k$ space to reveal the yield modulations in high-order harmonic generation (HHG) processes in solid crystals.

117. Sensitive Detection Scheme for Attosecond Transient Absorption Spectroscopy

Mikhail Volkov (LMU Munich)

01/07/2019, 18:15

poster

We demonstrate a sensitive attosecond transient absorption scheme based on the balanced detection principle. We also find that the dominant noise source is the laser intensity fluctuation which causes a blueshift of the harmonic spectra.

15. Single-Shot Imaging of Electron Band Structure by All-Optical Temporal Interferometry

Mr Liang Li (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

We propose a method for single-shot imaging of electron band structure. The electron band structure is encoded in the carry-envelope-phase (CEP) dependent frequency-shift of high harmonic radiation generated by a few-cycle laser field. By analyzing the quantum trajectories, the relation between electron band structure and frequency of the emitted radiation is established with a temporal...

62. Soft X-ray Absorption Spectroscopy of Molecules in Solution with a Table-top Femtosecond High Harmonic Source

Dr Arnaud Rouzée (Max Born Institute)

01/07/2019, 18:15

poster

We present first soft X-ray absorption spectra of solvated organic molecules and inorganic salts recorded with a broadband high harmonic source delivering soft X-ray pulses in a photon energy range between 270 eV and 450 eV.

110. Soliton Enhancement Cavities

Maximilian Högner (Max-Planck-Institut für Quantenoptik)

01/07/2019, 18:15

poster

We report temporal soliton formation in a free-space enhancement cavity. Enabled by a spectrally tailored input coupler, a self-stabilizing 37-fs cavity soliton was driven by 350-fs laser pulses at a peak power enhancement of 3200.

36. Spectral Broadening of a 500W, 5mJ Femtosecond Laser

Dr Steffen Hädrich (Active Fiber Systems GmbH)

01/07/2019, 18:15

poster

In this contribution, we present a significant up-scaling of the average power of stretched hollow-core-fibers by spectrally broaden 5 mJ, 500 W, 280 fs pulses in a 4 m long, 450 $\mu$m inner-diameter fiber to a bandwidth supporting sub-17fs pulses.

33. Spectral Shifts in Mid-infrared Assisted High-order Harmonic Generation in Gases

Balázs Major (ELI-ALPS, ELI-HU Non-Profit Ltd., University of Szeged)

01/07/2019, 18:15

poster

We study high-order harmonic generation in a two-color configuration. Additionally to yield enhancement, cut-off extension and continuum generation, we report and explain a spectral shift of harmonic peaks controlled by the delay between the pulses.

77. Steering the H$_{2}$CSO Sulfine's Photochemistry with Few-Cycle Pulses: A Computational Study

Benoit Mignolet (University of Liege)

01/07/2019, 18:15

poster

We demonstrate the ability of intense few-cycle pulses to steer photochemical reactions by taking advantage of their ultrashort nature to dynamically tailor potential energy surfaces and to induce a radiative dumping in an ultrafast pump-dump scheme.

54. Strong 50-attosecond Water Window Pulses by a Midinfrared Waveform Synthesizer

Dr Eiji J. Takahashi (RIKEN)

01/07/2019, 18:15

poster

Using 100-mJ-class midinfrared laser pulses, that are generated by a dual-chirped optical parametric amplification (DC-OPA) system, for a multi-channel waveform synthesizer, strong ‘water window’ soft x-ray harmonics with 50-attosecond duration can be generated.

145. Strong Field Photoelectron Holography by Multi-cycle Counter Rotating Bicircular Laser Field

Qinghua Ke (Huazhong University of Science and Technology)

01/07/2019, 18:15

poster

Our previous works reveal structure information, dynamics of valence electron, and tunneling ionization time can be encoded in the hologram in photoelectron momentum distribution (PEMD) and how to extract them. Recently, we study photoelectron holography in multicycle strong counter rotating laser fields by solving time dependent Schrodinger equation (TDSE).

127. Sub-cycle Time Resolution of Multi-photon Momentum Transfer in Strong-field Ionization

Benjamin Willenberg (ETH Zurich)

01/07/2019, 18:15

poster

We experimentally demonstrate that the strong-field momentum transfer in laser propagation direction from the field onto the photoelectrons is a time-dependent process within an optical cycle. The observation can mostly be explained with a classical model of a free electron in a laser field, extended by the parent ion interaction and an additional time-dependent initial momentum shift.

128. Symmetry of Molecular Rydberg States Revealed by Attosecond Transient Absorption Spectroscopy

Dr Peng Peng (National Research Council and University of Ottawa)

01/07/2019, 18:15

poster

We applied attosecond transient absorption spectroscopy to probe aligned N$_{2}$ and O$_{2}$ molecules. The direction of the electronic transitions was determined and the symmetry of the final states was identified.

38. Table-top High Energy 7 µm OPCPA for Strong Field Physics

Ugaitz Elu (ICFO)

01/07/2019, 18:15

poster

We present the development of a 0.7 mJ pulse energy, 188 fs pulse duration 7 µm OPCPA at 100 Hz and we show the generation of high harmonics in ZnSe covering all the visible and near-infrared regime.

45. Temporal Characterization of a Two-color Laser Field Using the Tunneling Ionization Method

Mr Jeong-uk Shin (Gwangju Institute of Science and Technology)

01/07/2019, 18:15

poster

The temporal characterization of a two-color laser field is performed using the tunneling ionization method. It is shown that the waveform of the laser field is successfully reconstructed from the modulation of the ionization yield.

125. Terahertz Yield from ZnO Crystal Driven by Strong Laser Pulse

Dr Lu Liu (Graduate School of China Academy of Engineering Physics)

01/07/2019, 18:15

poster

We theoretically investigate the Terahertz emission from ZnO using the Semiconductor Bloch equations. The relation between the laser intensity and THz yield is unexpected, which is closely related to the band structure and Bloch oscillation.

57. The Role of the Time Delay in the Reflection and Transmission of Ultrashort Electromagnetic Pulses on a System of Parallel Current Sheets

Mónika Polner (ELI-ALPS, ELI-HU Non-profit Ltd.)

01/07/2019, 18:15

poster

The reflection and transmission of a few-cycle laser pulse impinging on two parallel thin metal layers have been analyzed. This study means a generalization of an earlier work, in which the role of the collective radiative back-reaction of one layer has been derived.

12. The Three-dimensional Carrier-envelope-phase Map of Focused Few-cycle Pulsed Gaussian Beams

Dr Balázs Major (ELI-ALPS, ELI-HU Non-Profit Ltd., University of Szeged)

01/07/2019, 18:15

poster

We derive an analytical expression for the complete three-dimensional carrier-envelope-phase (CEP) distribution in the focal volume of ultrashort pulsed beams. We show how to tailor the CEP map of mirror-focused and lens-focused few-cycle pulses practically.

83. Theoretical Investigation of Resonant High-Harmonic Generation from Transition Metal Plasma Based on First-Principles Method

Mr Imam S. Wahyutama (The University of Tokyo)

01/07/2019, 18:15

poster

Resonant high-harmonic generation (rHHG) offers an attractive way for increasing conversion efficiency at the resonant energy. In this work, we theoretically investigate the physical origin of resonant enhancement from atomic Mn and its cation and have found that the enhancement is attributable to a constructive interference between 3p-3d transition components.

74. Time-Resolved Exchange Interaction in Noble Gas Ionization

Dr Stefanos Carlström (Max Born Institute)

01/07/2019, 18:15

poster

With the recollisional imaging enabled by the above-threshold ionization process, we induce and study exchange interaction, temporally and spatially resolved.

5. Topological Strong Field Physics on Sub-laser Cycle Timescale

Dr Álvaro Jiménez-Galán (Max-Born-Institut)

01/07/2019, 18:15

poster

Topological state is linked with dynamics, as manifested via chiral-edge currents. But is there an inherent timescale, associated with topology? We address this question using unique properties of primary electronic response to strong optical fields.

105. Two-color Double-hand Attoclock Photoelectron Interferometry

Dr Meng Han (Peking University), Prof. Yunquan Liu (Peking University)

01/07/2019, 18:15

poster

We use the two-color (400 nm + 800 nm) co-rotating circularly polarized laser fields to ionize argon atoms. In this double-hand attoclock, we introduce a spatially rotating temporal Young’s two-slit interferometer with the variable slit width, in which the oppositely modulated wave packets originating from consecutive laser cycles are dynamically prepared and interfered. Developing a...

39. Two-colour Interferometer for Field Synthesis and Attosecond Streaking

Mr Bruce Weaver (Imperial College London)

01/07/2019, 18:15

poster

We present a two-colour femtosecond field synthesiser deployed in attosecond streaking measurements at surfaces.

64. Ultrafast Dynamics in Polythiophene Probed with Transient Absorption Spectroscopy at the Sulphur L$_{2,3}$ Edge

Douglas Garratt (Imperial College London)

01/07/2019, 18:15

poster

We present results from transient absorption spectroscopy measured with a HHG generated supercontinuum at the sulphur L$_{2,3}$-edge of poly(3-hexylthiophene) (P3HT) following single photon excitation at the $\pi - \pi^{*}$ resonance.

133. Ultrafast Exciton Buildup in Monolayer MoS$_2$

Valerie Smejkal (Vienna University of Technology)

01/07/2019, 18:15

poster

We study the ultrafast relaxation of excited carriers into the lowest lying excitonic state of monolayer MoS$_2$ after excitation with $\approx$ 20fs laser pulses with different carrier frequencies using a density-matrix-formalism including many-body effects and electron-phonon scattering from ab-initio calculations.

50. Ultrafast Hole Migration Resolved in Space and Time

Dr Thomas Barillot (EPFL)

01/07/2019, 18:15

poster

In this work, we report the first direct measurement of a short lived hole wavepacket migration (lifetime of ~15fs) in the isopropanol molecule (C$_{3}$H$_{8}$O) by means of an X-ray pump, X-ray probe scheme with a few femtosecond time resolution at the LCLS XFEL facility.

65. When Light-induced Fano Profiles Meet the Condensed Phase

Antonio Picon (UAM)

01/07/2019, 18:15

poster

We demonstrate a universal feature on attosecond X-ray transient absorption spectra that emerges from the light-induced coherent intraband dynamics. This feature is linked to previous studies of light-induced Fano resonances in atomic systems.

35. XUV Pulse Amplification in High-harmonic Generation in Argon

Dr Carles Serrat (Universitat Politecnica de Catalunya)

01/07/2019, 18:15

poster

We report on the amplification of XUV pulses in the frame of high-harmonic generation in argon. By synchronizing a strong IR femtosecond light pulse with a weak XUV attosecond pulse, our single-atom simulations explain the observed amplification in the 26 - 45 eV photon energy region.

60. XUV-Assisted High-Order-Harmonic-Generation Spectroscopy

Dr Tatiana S. Sarantseva (Voronezh State University)

01/07/2019, 18:15

poster

High harmonic generation is analyzed in an intense IR- and weak XUV- fields. Multiple plateaus in harmonic spectra are discussed in terms of XUV-assisted multiphoton photorecombination cross section (PRCS). Multiphoton PRCS retrieving procedure is suggested.