@article{MTMT:34596731,
	title = {Three-photon and four-photon absorption in lithium niobate measured by the Z-scan technique},
	url = {https://m2.mtmt.hu/api/publication/34596731},
	author = {Benabdelghani, Imene and Tóth, György and Krizsán, Gergő and Bazsó, Gábor and Szaller, Zsuzsanna and Mbithi, Nelson and Rácz, Péter and Dombi, Péter and Polónyi, Gyula and Hebling, János},
	doi = {10.1364/OE.505995},
	journal-iso = {OPT EXPRESS},
	journal = {OPTICS EXPRESS},
	volume = {32},
	unique-id = {34596731},
	issn = {1094-4087},
	abstract = {Open-aperture Z-scan measurements have been carried out to investigate the three-photon (3 PA) and four-photon absorption (4 PA) coefficients at 800 nm and 1030 nm wavelengths, respectively in congruent and stoichiometric lithium niobate (cLN, sLN) with different concentrations of Mg doping. The laser pulse duration at the two wavelengths were 40 and 190 fs. The peak intensity inside the crystals varied between approximately 110 and 550 GW/cm 2 . The 3 PA and 4 PA coefficients were evaluated using a theoretical model and the results suggest that their minima are at or around the Mg doping level corresponding to the threshold for suppressing photo-refraction for both cLN and sLN. This result can be attributed to the contribution of crystal defects to the 3 PA and 4 PA processes. Furthermore, the 4 PA at 1030 nm exhibited greater nonlinear absorption than the 3 PA at 800 nm under the same intensity level. Possible reasons for this unexpected behavior are discussed. Overall, comparing the 3 PA and 4 PA values of these crystals will enable for selection of the optimum composition of LN crystal for efficient THz generation and for other nonlinear optical processes requiring high pump intensities.},
	year = {2024},
	pages = {7030-7043},
	orcid-numbers = {Rácz, Péter/0000-0001-5099-1031; Dombi, Péter/0000-0002-0736-3512}
}

@article{MTMT:34494015,
	title = {Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources},
	url = {https://m2.mtmt.hu/api/publication/34494015},
	author = {Tóth, György and Illés, Gergő and Nazymbekov, Gabit and Mbithi, Nelson and Almási, Gábor and Hebling, János},
	doi = {10.1038/s41598-023-51139-4},
	journal-iso = {SCI REP},
	journal = {SCIENTIFIC REPORTS},
	volume = {14},
	unique-id = {34494015},
	issn = {2045-2322},
	abstract = {In the last decade, intense research has been witnessed on developing compact, terahertz (THz) driven electron accelerators, producing electrons with a sub-MeV—few tens of MeV energy. Such economical devices could be used in scientific and material research and medical treatments. However, until now, the extremely high-energy THz pulses needed by the THz counterparts of the microwave accelerators were generated by optical rectification (OR) of ultrafast Ti:sapphire or Yb laser pulses. These lasers, however, are not very effective. Because of this, we use numerical simulations to investigate the possibility of generating high-energy THz pulses by the OR of pulses produced by CO2 lasers, which can have high plug-in efficiency. The results obtained supposing optical rectification (OR) in GaAs demonstrate that consideration of the self-phase-modulation (SPM) and the second-harmonic-generation (SHG) processes is indispensable in the design of CO2 laser-based THz sources. More interestingly, although these two processes hinder achieving high laser-to-THz conversion efficiency, they can still surpass the 1.5% value, ensuring high system efficiency and making the CO2 laser OR system a promising THz source. Our finding also has important implications for other middle-infrared laser-pumped OR-based THz sources.},
	year = {2024},
	eissn = {2045-2322}
}

@inproceedings{MTMT:34417852,
	title = {Investigation of Terahertz Pulse Generation in Semiconductors Pumped at Long Infrared Wavelengths},
	url = {https://m2.mtmt.hu/api/publication/34417852},
	author = {Polónyi, Gyula and Tóth, György and Mbithi, Nelson and Tibai, Zoltán and Benabdelghani, Imene and Nasi, Luis and Krizsán, Gergő and G., Illés and Hebling, János},
	booktitle = {2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)},
	doi = {10.1109/CLEO/EUROPE-EQEC57999.2023.10231383},
	unique-id = {34417852},
	abstract = {Recently, there has been a surge in developing highly efficient, scalable, and compact THz sources with high pumping energy for research in particular in biology, medicine, or particle acceleration. Among various approaches, THz generation by optical rectification (OR) provides an effective and tabletop solution for THz pulses flexibly tailored to the mentioned needs. Up to now, high energy in the low frequency THz regime was reached in LN (1.4 mJ) [1], and in the DSTMS organic crystal (0.9 mJ) [2]. While the former suffers several significant limitations which reduce the efficiency below 1%, the latter has, as all organic nonlinear crystals do, a low damage threshold, hindering its practical use. ZnTe has already been proven to be an efficient source when the low-order multiphoton absorption is suppressed [3], and shows that semiconductors can potentially be good candidates for efficient, high-energy THz sources when pumped at longer wavelength. © 2023 IEEE.},
	keywords = {ENERGY; wide band gap semiconductors; Optical pumping; THz pulse; THz generation; Optical rectifications; Particle acceleration; Terahertz waves; Tellurium compounds; Infrared wavelengths; II-VI semiconductors; Terahertz pulse generation; THz sources; Long infrared; Pumping energies},
	year = {2023},
	orcid-numbers = {Tibai, Zoltán/0000-0002-3196-7586}
}

@{MTMT:34167389,
	title = {Three-photon and Four-photon Absorption in Lithium Niobate and Lithium Tantalate by Z-scan Technique},
	url = {https://m2.mtmt.hu/api/publication/34167389},
	author = {Benabdelghani, Imene and Tóth, György and Krizsán, Gergő and Mbithi, Nelson and Bazsó, Gábor and Rácz, Péter and Dombi, Péter and Hebling, János and Polónyi, Gyula},
	booktitle = {2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)},
	doi = {10.1109/CLEO/Europe-EQEC57999.2023.10232756},
	unique-id = {34167389},
	year = {2023},
	orcid-numbers = {Rácz, Péter/0000-0001-5099-1031; Dombi, Péter/0000-0002-0736-3512}
}

@misc{MTMT:33872930,
	title = {Kompakt terahertzes részecskegyorsító elrendezés = Table-top THz-based electron accelerator setup},
	url = {https://m2.mtmt.hu/api/publication/33872930},
	author = {Balázs, Sarkadi and Turnár, Szabolcs and Kiss, Mátyás and Mátyás, Reményi and Anna, Bereghszászy and Almási, Gábor and Hebling, János and Tibai, Zoltán},
	unique-id = {33872930},
	year = {2023},
	orcid-numbers = {Tibai, Zoltán/0000-0002-3196-7586}
}

@article{MTMT:33699389,
	title = {Nanostructures for in-situ surface-enhanced Kretschmann-Raether ellipsometry},
	url = {https://m2.mtmt.hu/api/publication/33699389},
	author = {Mukherjee, Deshabrato and Kalas, Benjamin and Burger, Sven and Sáfrán, György and Serényi, Miklós and Fried, Miklós and Petrik, Péter},
	doi = {10.1117/12.2649080},
	journal-iso = {PROCEEDINGS OF SPIE},
	journal = {PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING},
	volume = {12428},
	unique-id = {33699389},
	issn = {0277-786X},
	year = {2023},
	eissn = {1996-756X},
	pages = {206-214},
	orcid-numbers = {Sáfrán, György/0000-0003-3708-3551; Serényi, Miklós/0000-0003-4684-3452; Fried, Miklós/0000-0002-9194-735X; Petrik, Péter/0000-0002-5374-6952}
}

@mastersthesis{MTMT:33685028,
	title = {Ultrarövid lézerimpulzusok kölcsönhatása dielektrikumközegekkel},
	url = {https://m2.mtmt.hu/api/publication/33685028},
	author = {Csajbók, Viktória},
	unique-id = {33685028},
	year = {2023}
}

@mastersthesis{MTMT:33685022,
	title = {Többfotonos adiabatikus átmenetek alkalmazása rubídium atomok koherens gyorsítására},
	url = {https://m2.mtmt.hu/api/publication/33685022},
	author = {Varga-Umbrich, Károly},
	unique-id = {33685022},
	year = {2023}
}

@article{MTMT:33585088,
	title = {Rapidly rotating neutron stars with realistic nuclear matter equation of state},
	url = {https://m2.mtmt.hu/api/publication/33585088},
	author = {Kacskovics, Balázs and Barta, Dániel and Vasúth, Mátyás Zsolt},
	doi = {10.1002/asna.20220109},
	journal-iso = {ASTRON NACHRICH},
	journal = {ASTRONOMISCHE NACHRICHTEN},
	volume = {344},
	unique-id = {33585088},
	issn = {0004-6337},
	abstract = {We performed the comparison of three different numerical codes for constructing equilibrium models; (I) a code for static equilibrium configurations, (II) an implementation of the Hartle-Thorne slow-rotation approximation, (III) a numerical solution of the full Einstein equations by LORENE. We aimed to construct sequences of uniformly rotating configurations at various rotation frequencies up to the Keplerian frequency for a hybrid hadronic-quark matter EOS where a smooth transition is provided between two separate phases. We investigated the difference between the results computed by the implementation of Hartle-Thorne slow-rotation approximation and by LORENE/nrotstar, respectively. We have concluded that the codes can increase the difference between the slow-rotating and the fast-rotating approach exponentially, reaching 6.67% for the maximal mass configuration rotating at the Keplerian frequency.},
	keywords = {Relativistic stars; compact stars; numerical general relativity; pulzars},
	year = {2023},
	eissn = {1521-3994},
	orcid-numbers = {Barta, Dániel/0000-0001-6841-550X}
}

@mastersthesis{MTMT:33683934,
	title = {The Interplay of Unitary and Permutation Symmetries in Composite Quantum Systems},
	url = {https://m2.mtmt.hu/api/publication/33683934},
	author = {Jakab, David},
	unique-id = {33683934},
	year = {2022},
	orcid-numbers = {Jakab, David/0000-0002-1719-1152}
}