A5059895315- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Laser-Plasma Interactions and Diagnostics
- Optical Coherence Tomography Applications
- Mass Spectrometry Techniques and Applications
- Optical measurement and interference techniques
- Optical Network Technologies
- Solid State Laser Technologies
- Laser and Thermal Forming Techniques
- Optical Polarization and Ellipsometry
- Laser-induced spectroscopy and plasma
- Spectroscopy and Quantum Chemical Studies
- Laser Design and Applications
- Advanced Electron Microscopy Techniques and Applications
- Optical Imaging and Spectroscopy Techniques
- Cardiac Ischemia and Reperfusion
- Ion channel regulation and function
- Photoacoustic and Ultrasonic Imaging
- Advanced Optical Sensing Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Chemical Physics Studies
- Spinal Cord Injury Research
- Photonic and Optical Devices
ELI-HU Research and Development Non-Profit
2019-2024
University of Szeged
2012-2023
Instituto de Óptica "Daza de Valdés"
2019
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...
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...
Chromatic dispersion of a 37 cm long, solid-core photonic bandgap (PBG) fiber was studied in the wavelength range 740-840 nm with spectral interferometry employing Mach-Zehnder interferometer and high resolution spectrometer. The illuminated by Ti:sapphire laser providing 20 fs pulses. A comparative study has been carried out to find most accurate phase retrieval method that is suitable for measuring higher order chromatic dispersion. stationary point, minima-maxima, cosine function fit,...
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 present a detailed study on the generation of widely tunable visible light through four wave mixing in specifically designed micro-structured fibers. The fiber's properties are optimized for an efficient conversion to and near infrared with combined tunability from 620 910 nm picosecond Yb-doped source biomedical applications.
Abstract This paper presents a second harmonic assisted spectrally resolved interferometric technique that can overcome the limited spectral resolution of commercially available spectrometers in mid-infrared. The discussed scheme was validated by measuring group delay several well-known and frequently used materials. Our main motivation to characterize phase shift newly designed manufactured dispersive mirrors be for mid-infrared (MIR) post-compression. These were successfully implemented...
If multiple pulses, either higher-order or polarization modes, simultaneously travel in a fiber, they might overlap the time domain, hindering dispersion retrieval of modes question using conventional evaluation techniques.In this work, high-resolution windowed Fourier-ridges (WFR) algorithm is developed for spectrally resolved interferograms produced by light pulses that are overlapping time.The sufficiency one spectral interferogram to retrieve differential group and dependent chromatic...
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...
Three evaluation techniques of spectral interferograms were compared in order to find the most precise method which is sensitive higher dispersion a slightly birefringent hollow-core photonic crystal fiber. We showed that two fundamental modes have considerably different dispersive properties and concluded Fourier-method accurate.
The stability of the HR HHG beamlines at ELI ALPS laser facility (Hungary) was studied, and XUV generation simulated for main physical parameters to improve beamline efficiency.
Extreme ultraviolet (XUV) radiation is a tool of choice for studying ultrafast processes and atomic physics. Most experiments employing sources XUV radiation, such as high harmonic generation (HHG) or x-ray lasers, benefit from knowing the number photons delivered to target in every single shot, because possible shot-to-shot pulse fluctuation sources. Nonetheless, many setups lack noninvasive energy diagnostics, hindering simultaneous measurement utilization beam applications. We present an...
Applications based on photonic crystal fibers depend strongly their dispersion properties that might differ from the desired specifications due to deficiencies in manufacturing process. Since characteristics also be affected by placement of fiber, this paper effect various placements chromatic a commercially available HC-800-02 fiber was investigated between 760 and 870 nm with Fourier-transform spectral interferometry. To test scaling length, samples different lengths ranging 10 97 cm were...
Broadband dielectric beam steering mirrors are key components for nonlinear microscopes comprising tunable Ti:sapphire lasers. We characterize dispersion of a few mirror samples by spectral interferometry and show how it affects imaging quality.
A laboratory exercise has been developed in the frames of a new course called "Advanced undergraduate femtosecond optics", which aims to study dependence dispersion prism pair on positions prisms. For measurement we chose relatively simple technique, white light spectral interferometry. The consisting two identical fused silica prisms was placed sample arm Michelson-interferometer illuminated with tungsten halogen lamp. interferograms were observed low resolution spectrometer order have wide...
Avulsion injury results in motoneuron death due to the increased excitotoxicity developing affected spinal segments. This study focused on possible short and long term molecular receptor expression alterations which are thought be linked excitotoxic events ventral horn with or without anti-excitotoxic riluzole treatment. In our experimental model left lumbar 4 5 (L4, 5) roots of cord were avulsed. Treated animals received for 2 weeks. Riluzole is a compound that acts block voltage-activated...
One of the most widespread and reliable techniques for spectral phase characterization optical elements is spectrally resolved interferometry (SRI) [1] , [2] which utilizes a two-arm interferometer illuminated by broadband light source spectrometer to record generated fringes. The investigated element placed in one arm, its can be extracted using Fourier-transform (FT) based methods [3] [4] instance, are accurate, even when low dispersion values determined. detriment this evaluation method,...
We present a novel polarization alignment technique based on windowed Fourier-transform (WFT) spectral interferometry to determine the wavelength-dependent orientation of principal axes photonic crystal fibers (PCFs). To test technique, commercially available, 82.5-cm-long HC-800-02 type hollow-core PCF was measured. The angles belonging fast and slow fiber were determined from peak intensity values ridges in WFT map at different wavelengths. demonstrate that tested is wavelength-dependent....
One of the most widespread and reliable techniques for spectral phase characterization optical elements is spectrally resolved interferometry (SRI), which utilizes a two-arm interferometer illuminated by broadband light source spectrometer to record generated fringes, are usually evaluated using Fourier-transform-based methods. detriment these methods, that they require high resolution. Considering spectrometers in mid-infrared (MIR) region have typically few nm resolution, we propose two...
Attosecond pulses were widely utilized to investigate ultra-fast phenomena in the natural time scale of electron motion - attosecond (10 −18 s) since its first demonstrations 20 years ago [1] , [2] . However, repetition rate most sources limited several kHz, which hindered many applications such as photoelectron emission from solids where space charge effect is needed be alleviated, and statistic measurements less events every laser shot are preferred. Hence, achieve high signal-to-noise...
In the literature it is well known that produced high-order harmonics inherit certain properties from driving laser especially in terms of spectral characteristics [1] , therefore introducing modulation generating spectrum we can have significant impact on high harmonic generation process [2] [3] .