Dr. Tímea Grósz Profile

Dr. Tímea Grósz

Research Fellow at ELI-ALPS Research Institute

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Publications (6)

Proceedings Article | 8 June 2023 Presentation + Paper

Recent experiments and advances at the high-repetition-rate attosecond beamlines of ELI ALPS

Lénárd Gulyás Oldal, Tamás Csizmadia, Zoltán Filus, Tímea Grósz, Massimo De Marco, Péter Jójárt, Imre Seres, Zsolt Bengery, Barnabás Gilicze, Katalin Varjú, Subhendu Kahaly, Balázs Major

Proceedings Volume 12582, 1258204 (2023) https://doi.org/10.1117/12.2664845

KEYWORDS: Extreme ultraviolet, Monochromators, Spectroscopy, Reflectance spectroscopy, Photons, Solids, Pulsed laser operation, Attosecond phenomena, Ultrafast measurement systems

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Proceedings Article | 18 April 2021 Presentation + Paper

High-resolution mid-MIR spectrally resolved interferometry

T. Grósz, M. Kurucz, R. Flender, A. Börzsönyi, U. Gimzevskis, A. Samalius, D. Hoff, B. Kiss

Proceedings Volume 11770, 1177019 (2021) https://doi.org/10.1117/12.2591756

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One of the most widespread and reliable techniques for spectral phase characterization of optical elements is spectrally resolved interferometry (SRI), which utilizes a two-arm interferometer illuminated by a broadband light source and a spectrometer to record the generated spectral fringes, which are usually evaluated by using Fourier-transform-based methods. One detriment to these methods, that they require high spectral resolution. Considering that most of the spectrometers in the mid-infrared (MIR) region have typically a few nm spectral resolution, we propose two alternative methods for measurements in this spectral region, second harmonic assisted SRI (SH-SRI) and dual-band SRI. The SH-SRI method utilizes second harmonic generation, which allows for high-precision phase retrieval by shifting the detection range from the MIR regime to the near-infrared, where high-resolution spectrometers are commercially available. The dual-band SRI method has the capabilities of the SH-SRI, while simultaneously probing the optical element at the second harmonic frequency band as well. Using the Fourier transform method, the acquired phase can be obtained from a single interferogram at both frequency bands simultaneously, which effectively doubles the measurement bandwidth compared to the original SRI and the SH-SRI without increasing the requirements on the bandwidth and the resolution of the spectrometer. To determine the performance of these new schemes, we have measured the spectral phase shift of several optical windows with both SH-SRI and dual-band SRI. Their accuracy was significantly higher than that of the conventional SRI technique that relied on low-resolution spectrometers operating in the MIR region. We used the SH-SRI technique also to verify the phase performance of custom-made MIR dispersive mirrors, designed with specific dispersion characteristics. With the dispersive mirrors, we were able to compress our spectrally broadened pulses to 19.6 fs (<2 cycles) at 3170 nm central wavelength with 8.2 W average power.

Proceedings Article | 15 April 2019 Paper

Complete dispersion characterization of microstructured optical fibers using windowed Fourier-transform spectral interferometry

M. Horváth, T. Grósz, B. G. Nagyillés, K. Vuković, A. P. Kovács

Proceedings Volume 11029, 110290Q (2019) https://doi.org/10.1117/12.2520571

KEYWORDS: Polarization, Optical fibers, Dispersion, Interferometry, Structured optical fibers

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Proceedings Article | 8 October 2015 Open Access

Advanced laboratory exercise: studying the dispersion properties of a prism pair

T. Grósz, L. Gulyás, A. Kovács

Proceedings Volume 9793, 97931N (2015) https://doi.org/10.1117/12.2223123

KEYWORDS: Prisms, Halogens, Lamps, Interferometry, Spectroscopy, Dispersion, Femtosecond phenomena, Tungsten, Optical components, Silica

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Proceedings Article | 2 May 2014 Paper

Higher order dispersion measurement using the stationary phase point method

T. Grósz, A. Kovács

Proceedings Volume 9128, 91280R (2014) https://doi.org/10.1117/12.2051651

KEYWORDS: Spiral phase plates, Dispersion, Optical fibers, Optical components, Interferometers, Interferometry, Spectroscopy, Phase retrieval, Phase measurement, Spectral resolution

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Proceedings Article | 3 May 2013 Paper

Characterisation of optical pulses travelling through a photonic crystal fibre using Fourier-transform spectral interferometry

T. Grósz, M. Kiss, A. Kovács

Proceedings Volume 8775, 87750E (2013) https://doi.org/10.1117/12.2017260

KEYWORDS: Spiral phase plates, Dispersion, Phase measurement, Photonic crystal fibers, Interferometry, Picosecond phenomena, Absorption, Spectroscopy, Optical components, Interferometers

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Showing 5 of 6 publications

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