Tamás Csizmadia
A5056800908- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Laser Design and Applications
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Solid State Laser Technologies
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Particle Accelerators and Free-Electron Lasers
- Photonic Crystal and Fiber Optics
- Spectroscopy and Laser Applications
- Photorefractive and Nonlinear Optics
- Quantum optics and atomic interactions
- Atomic and Molecular Physics
- Advanced Optical Sensing Technologies
- Photocathodes and Microchannel Plates
- Optical Coatings and Gratings
ELI-HU Research and Development Non-Profit
2017-2024
This review presents the technological infrastructure that will be available at Extreme Light Infrastructure Attosecond Pulse Source (ELI-ALPS) international facility. ELI-ALPS offer to scientific community ultrashort pulses in femtosecond and attosecond domain for time-resolved investigations with unprecedented levels of high quality characteristics. The laser sources beamlines facility make technology accessible scientists lacking access these novel tools. Time-resolved investigation...
Attoscience is the emerging field that accesses fastest electronic processes occurring at atomic and molecular length scales with attosecond (1 as = 10−18 s) time resolution having wide ranging physical, chemical, material science biological applications. The quintessential one of most fundamental in this domain generation phase locked XUV pulses. theoretical approach to understand process incorporates a fully quantum or semi classical relativistic description coherent charge dynamics...
Advancements in light engineering have led to the creation of pulsed laser sources capable delivering high-repetition-rate, high-power few-cycle pulses across a wide spectral range, enabling exploration many fascinating nonlinear processes occurring all states matter. High-harmonic generation, one such process, which converts low-frequency photons driver field into soft x-rays, has revolutionized atomic, molecular, and optical physics, leading progress attosecond science ultrafast...
The ALPS Facility of ELI ERIC provides few-cycle light pulse sources to the international user community. A key group beamlines utilizes 1 mJ, sub-6 fs, 100 kHz fiber-based laser system, HR1, which supports attosecond high harmonic generation applications and time-resolved spectroscopy experiments. While repetition rate facilitates statistical analysis, it also puts a thermal demand on beam delivery targetry due average power. In this paper, we present system as solution for discrete rates...
The ALPS Facility of ELI ERIC provides few-cycle light pulse sources to the international user community. A key group beamlines utilizes 1 mJ, sub-6 fs, 100 kHz fiber-based laser system, HR1, which supports attosecond high harmonic generation applications and time-resolved spectroscopy experiments. While repetition rate facilitates statistical analysis, it also puts a thermal demand on beam delivery targetry due average power. In this paper, we present system as solution for discrete rates...
Quantum mechanically, photoionization can be fully described by the complex amplitudes that describe transition between ground state and continuum state. Knowledge of value phase these has been a central interest in studies newly developing attosecond science, since reveal important information about phenomena such as electron correlation. We present new attosecond-precision interferometric method angle-resolved measurement for amplitudes, using two phase-locked Extreme Ultraviolet pulses...
Abstract We generate attosecond pulse train (APT) in argon driven by the high repetition rate (HR) laser of extreme light infrastructure-attosecond source (ELI-ALPS), providing 100 kHz, 80 W, 1030 nm, 40 fs pulses from a fiber chirped-pulse amplification (fiber-CPA) system. Under current operating conditions harmonic generation beamline (HR-GHHG), we observed average duration to be 395 as measured using technique reconstruction beating interference two-photon transitions. The uses an...
High-repetition rate attosecond pulse sources are indispensable tools for time-resolved studies of electron dynamics, such as coincidence spectroscopy and experiments with high demands on statistics or signal-to-noise ratio, especially in the case solid big molecule samples chemistry biology. Although high-repetition lasers, pulses a pump-probe configuration possible to achieve, until now, only few light have been demonstrated. Here, by shaping driving laser an annular beam, 100 kHz train...
We present the experimental realization of spectrally tunable, ultrashort, quasi-monochromatic extreme ultraviolet (XUV) pulses generated at 100 kHz repetition rate in a user-oriented gas high harmonic generation beamline Extreme Light Infrastructure—Attosecond Pulse Source facility. Versatile spectral and temporal shaping XUV is accomplished with double-grating, time-delay compensated monochromator accommodating two composing stages novel, asymmetrical geometry. This configuration supports...
Single photon laser enabled Auger decay (spLEAD) has been redicted theoretically [Phys. Rev. Lett. 111, 083004 (2013)] and here we report its first experimental observation in neon. Using coherent, bichromatic free-electron pulses, have detected the process coherently controlled angular distribution of emitted electrons by varying phase difference between two fields. Since spLEAD is highly sensitive to electron correlation, this a promising method for probing both correlation ultrafast hole...
Intense, mutually coherent beams of multiharmonic extreme ultraviolet light can now be created using seeded free-electron lasers, and the phase difference between harmonics tuned with attosecond accuracy. However, absolute value is generally not determined. We present a method for determining precisely relationship fundamental wavelength its second harmonic, as well amplitude ratio. Only few easily calculated theoretical parameters are required in addition to experimental data.Received 27...
This work theoretically investigates high-order harmonic generation in rare-gas atoms driven by two temporally delayed ultrashort laser pulses. Apart from their temporal delay, the pulses are identical. Using a single-atom model of laser-matter interaction it is shown that photon energy generated harmonics controllable within range one eV---a bandwidth comparable to fundamental field---by varying time delay between generating It also demonstrated double have advantageous characteristics,...
Abstract Single-photon laser enabled Auger decay (spLEAD) is an electronic de-excitation process which was recently predicted and observed in Ne. We have investigated it using bichromatic phase-locked free electron radiation extensive angle-resolved photoelectron measurements, supported by a detailed theoretical model. first used separately the fundamental wavelength resonant with Ne + 2 s –2 p transition, 46.17 nm, its second harmonic, 23.08 then their combination. In latter case phase...
We generate high-order harmonics in gaseous medium with tunable photon energy using time domain interferometry of double pulses a non-collinear generation geometry. The method is based on the fact that generated inherit certain spectral properties driving laser. two temporally delayed ultrashort laser pulses, identical all parameters, are produced by custom-made split-and-delay unit utilizing wave front splitting without significant loss. arrangement easy to implement any attosecond pulse...
We investigate the electron quantum path interference effects during high harmonic generation in atomic gas medium driven by ultrashort chirped laser pulses. To achieve that, we identify and vary different experimentally relevant control parameters of such a driving pulse influencing spectra. Specifically, impact duration, peak intensity instantaneous frequency is studied self-consistent manner based on Lewenstein formalism. Simulations involving macroscopic propagation are also considered....
We have used the FERMI free-electron laser to perform time-resolved photoelectron imaging experiments on a complex group of resonances near 15.38 eV in absorption spectrum molecular nitrogen, N2, under jet-cooled conditions. The new data complement and extend earlier work Fushitani et al. [Opt. Express 27, 19702–19711 (2019)], who recorded spectra for this same resonances. Time-dependent oscillations are observed both yields angular distributions, providing insight into interactions among...
Free-electron lasers (FELs) can produce radiation in the short wavelength range extending from extreme ultraviolet (XUV) to X-rays with a few tens of femtoseconds pulse duration. These facilities have enabled significant breakthroughs field atomic, molecular, and optical physics, implementing different schemes based on two-color photoionization mechanisms. In this article, we present generation attosecond trains (APTs) at seeded FEL FERMI using beating multiple phase-locked harmonics. We...
In coherent control schemes, pathways connecting an initial and a final state can be independently controlled by manipulating the complex amplitudes of their transition matrix elements. For paths characterized absorption multiple photons, these quantities depend on magnitude phase between intermediate steps, are expected to strongly affected presence resonances. We investigate photoemission process in neon using phase-controlled two-color extreme ultraviolet pulse with frequency proximity...
Abstract The generation of attosecond pulse trains at free-electron lasers opens new opportunities in ultrafast science, as it gives access, for the first time, to reproducible, programmable, extreme ultraviolet (XUV) waveforms with high intensity. In this work, we present a detailed analysis theoretical model underlying temporal characterization recently generated laser FERMI. particular, validity approximations used correlated photoelectron spectra two-color photoionization experiments are...
We present the design and implementation of a new, modular gas target suitable for high-order harmonic generation using high average power lasers. To ensure thermal stability in this heat load environment, we implement an appropriate liquid cooling system. The system can be used multiple-cell configurations allowing to control cell length aperture size. was optimized with flow simulations characteristics, vacuum compatibility medium properties. Finally, experimentally validated by conducting...
The reconstruction of ultrashort optical pulses with a complex intensity substructure is demonstrated using the Self-Referenced Spectral Interferometry (SRSI) pulse characterization technique modified phase retrieval algorithm. A correction spectral term extracted by manipulation temporal interferogram, allowing treatment scenarios complicated shapes, where original algorithm fails. improved SRSI verified through application on two temporally well-separated having same polarization direction...
Wave packet interferometry with vacuum ultraviolet light has been used to probe a complex region of the electronic spectrum molecular nitrogen, N2. packets Rydberg and valence states were excited by using double pulses (VUV), free-electron-laser (FEL) light. These wave composed contributions from multiple moderate principal quantum number (n ∼ 4–9) range vibrational rotational numbers. The phase relationship two FEL varied in time, but as demonstrated previously, shot-by-shot analysis allows...