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Serrat C, Seres J, Seres E, Dinh TH, Hasegawa N, Nishikino M, Namba S. Parametric attosecond pulse amplification far from the ionization threshold from high order harmonic generation in He . Opt Express 2020; 28:24243-24252. [PMID: 32752406 DOI: 10.1364/oe.398595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
Parametric amplification of attosecond coherent pulses around 100 eV at the single-atom level is demonstrated for the first time by using the 3D time-dependent Schrödinger equation in high-harmonic generation processes from excited states of He+. We present the attosecond dynamics of the amplification process far from the ionization threshold and resolve the physics behind it. The amplification of a particular central photon energy requires the seed XUV pulses to be perfectly synchronized in time with the driving laser field for stimulated recombination to the He+ ground state and is only produced in a few specific laser cycles in agreement with the experimental measurements. Our simulations show that the amplified photon energy region can be controlled by varying the peak intensity of the laser field. Our results pave the way to the realization of compact attosecond pulse intense XUV lasers with broad applications.
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Seres J, Seres E, Serrat C, Young EC, Speck JS, Schumm T. All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity. Opt Express 2019; 27:6618-6628. [PMID: 30876243 DOI: 10.1364/oe.27.006618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
We realized a solid-state-based vacuum ultraviolet frequency comb by harmonics generation in an external enhancement cavity. Optical conversions were so far reported by only using gaseous media. We present a theory that allows the most suited solid generation medium to be selected for specific target harmonics by adapting the material's bandgap. We experimentally use a thin AlN film grown on a sapphire substrate to realize a compact frequency comb high-harmonic source in the Deep Ultraviolet (DUV) / Vacuum Ultraviolet (VUV) spectral range. By extending our earlier VUV source [Opt. Express26, 21900 (2018)] with the enhancement cavity, a sub-Watt level Ti:sapphire femtosecond frequency comb is enhanced to 24 W stored average power, its 3rd, 5th, and 7th harmonics are generated, and the targeted 5th harmonic's power at 160 nm increased by two orders of magnitude. The emerging nonlinear effects in the solid medium, together with suitable intra-cavity dispersion management, support optimal enhancement and stable locking. To demonstrate the realized frequency comb's spectroscopic ability, we report on the beat measurement between the 3rd harmonic beam and a 266 nm CW laser reaching about 1 MHz accuracy.
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Hardegger E, Seres J, Andreatta R, Szabo F, Zankovvska-Jasinska W, Romeo A, Rostetter C, Kindler H. 117. Welkstoffe und Antibiotika: Vorläufige, 26. Mitteilung) Synthese der Anhydro-lycomarasminsäure. Helv Chim Acta 2018. [DOI: 10.1002/hlca.19630460341] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- E. Hardegger
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - J. Seres
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - R. Andreatta
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - F. Szabo
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - W. Zankovvska-Jasinska
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - A. Romeo
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - Ch. Rostetter
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
| | - H. Kindler
- Organisch-chemisches Laboratorium der Eidg. Technischen Hochschule, Zürich
- Istituto di Chimica Farmaceutica dell' Università di Roma
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Seres J, Seres E, Serrat C, Schumm T. Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate. Opt Express 2018; 26:21900-21909. [PMID: 30130892 DOI: 10.1364/oe.26.021900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 07/20/2018] [Indexed: 06/08/2023]
Abstract
We demonstrate non-perturbative 3rd (267 nm) and 5th (160 nm) harmonic generation in solids from a Ti:sapphire frequency comb (800 nm) at 108 MHz repetition rate. The experiments show that non-perturbative low harmonics are dominantly generated on the surface and on the interface between solids, and that they are not produced by bulk processes from the near-surface layer of the material. Measurements reveal that due to the lack of phase matching, the generated harmonics in bulk are suppressed by orders of magnitude compared to the signal generated on the surface. Our results pave the way for the development of all-solid-state high repetition rate harmonic sources for vacuum ultraviolet spectroscopy and high precision frequency comb metrology.
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Serrat C, Roca D, Seres J. Coherent amplification of attosecond light pulses in the water-window spectral region. Opt Express 2015; 23:4867-4872. [PMID: 25836521 DOI: 10.1364/oe.23.004867] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a theoretical study on coherent extreme ultraviolet (XUV) attosecond pulse amplification mediated by nonlinear parametric enhanced forward scattering occurring in the interaction of a strong femtosecond infrared (IR) laser pulse combined with a weak attosecond XUV pulse train with an atom. We predict large amplification of XUV radiation when the IR strong pulse and the XUV weak pulse are optimally phased. We study high-order harmonic processes (HHG) in He, He(+) and Ne(++), and show how although the HHG yield is largely affected by the particular atom used as target, nonlinear parametric XUV amplification is only weakly affected. We conclude that XUV nonlinear parametric attosecond pulse amplification can be most efficiently observed by using atoms with a high ionization potential and that the nonlinear amplification is robust at high photon energies where HHG is not efficient, such as in the water-window spectral region.
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Seres J, Seres E, Landgraf B, Ecker B, Aurand B, Kuehl T, Spielmann C. High-harmonic generation and parametric amplification in the soft X-rays from extended electron trajectories. Sci Rep 2014; 4:4234. [PMID: 24577220 PMCID: PMC3937789 DOI: 10.1038/srep04234] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 01/29/2014] [Indexed: 11/09/2022] Open
Abstract
We report, for the first time, the generation of high-order harmonics in a spectral range between 200 eV and 1 keV with an unusual spectral property: only every 4(th) (4i + 1, i∈ℵ) harmonic line appears, whereas the usual high-harmonic spectra consist of every odd (2i + 1) harmonic. We attribute this unique property to the quantum path interference of two extended electron trajectories that experience multiple re-scattering. In the well-established theory, electrons emitted via tunnel ionisation are accelerated by a laser field, return to the ion and recombine. The acceleration typically lasts for less than one optical cycle, and the electrons radiate in the extreme ultraviolet range at recombination. In contrast, for extended trajectories, electrons are accelerated over two or more optical cycles. Here, we demonstrate that two sets of trajectories dominate and provide substantial contributions to the generated soft X-ray radiation because they fulfil the resonance condition for X-ray parametric amplification.
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Affiliation(s)
- J Seres
- 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Insitute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria
| | - E Seres
- 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Insitute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria [3] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - B Landgraf
- 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - B Ecker
- 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany
| | - B Aurand
- 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany
| | - T Kuehl
- 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany
| | - C Spielmann
- 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
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Seres J, Seres E, Verhoef AJ, Tempea G, Streli C, Wobrauschek P, Yakovlev V, Scrinzi A, Spielmann C, Krausz F. Source of coherent kiloelectronvolt X-rays. Nature 2005; 433:596. [PMID: 15703738 DOI: 10.1038/433596a] [Citation(s) in RCA: 241] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Generating X-rays that have the properties of laser light has been a long-standing goal for experimental science. Here we describe the emission of highly collimated, spatially coherent X-rays, at a wavelength of about 1 nanometre and at photon energies extending to 1.3 kiloelectronvolts, from atoms that have been ionized by a 5-femtosecond laser pulse. This means that a laboratory source of laser-like, kiloelectronvolt X-rays, which will operate on timescales relevant to many chemical, biological and materials problems, is now within reach.
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Affiliation(s)
- J Seres
- Institut für Photonik, Technische Universität Wien, 1040 Wien, Austria
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Hardegger E, Rigassi N, Seres J, Egli C, Müller P, Fitzi KO. Welkstoffe und Antibiotika. 29. Mitteilung. Synthese von 2,4-Dimethoxy-6-hydroxy-9, 10-dihydrophenanthren. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19630460710] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Parara S, Seres J, Rokyta R, Stancíková M, Jurcovicová J. Differences in hormonal and inflammatory parameters in male Lewis and Long Evans rats with adjuvant arthritis. Int J Tissue React 2003; 25:99-104. [PMID: 14756191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
The purpose of the present study was (i) to compare secretory responses of prolactin and corticosterone to the acute stress of immobilization in male rats of the Lewis and Long Evans strains and (ii) to compare secretion of the two hormones in rats with fully developed adjuvant arthritis (AA) and their relationship with the intensity of the inflammatory reaction. A short immobilization of 5 min induced equal elevations of both hormones in both strains, but 20-min immobilization produced significantly stronger responses in Long Evans rats than in Lewis rats. AA inhibited prolactin secretion equally in both strains (from 11.6 +/- 1.3 ng/ml to 4.2 +/- 0.6 ng/ml in Lewis rats, p < 0.01, and from 3.7 +/- 0.6 to 2.12 +/- 0.1 ng/ml in Long Evans rats, p < 0.05), but caused a conspiciously larger elevation of corticosterone in the Long Evans than in the Lewis animals (11.5 +/- 1.2 microg/dl in Long Evans rats versus 5.1 +/- 0.5 microg/dl in Lewis rats, p < 0.01) while basal levels were similar. The larger corticosterone response in the Long Evans rats was associated with a stronger inflammatory reaction assessed by hind paw swelling (2.3 +/- 0.1 ml for Long Evans rats versus 1.8 +/- 0.08 ml for Lewis rats, p < 0.01) and plasma levels of nitric oxide (47.5 +/- 5.7 microM for Long Evans rats versus 28.7 +/- 2.5 microM for Lewis rats, p < 0.01) than in the Lewis males with lower corticosterone levels. In conclusion, there are significant, obviously genetically based, differences in the corticosterone responses to both immobilization and AA between the two strains, with the Long Evans rats reacting more strongly than the Lewis rats. The lack of the expected inverse relationship between corticosterone levels and the intensity of the inflammation indicates that the activity of corticosterone is not its primary determinant and that other important factors are involved.
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Affiliation(s)
- S Parara
- Department of Normal, Pathological and Clinical Physiology, Third Medical Faculty, Charles University, Prague, Czech Republic
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Seres J, Stancíková M, Svík K, Krsová D, Jurcovicová J. Effects of chronic food restriction stress and chronic psychological stress on the development of adjuvant arthritis in male long evans rats. Ann N Y Acad Sci 2002; 966:315-9. [PMID: 12114288 DOI: 10.1111/j.1749-6632.2002.tb04231.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of the present experiments was to study the effect of stress of chronic food restriction (FR) and of repeated psychological challenge (PS) on the development of adjuvant arthritis in the Long Evans male rats. In the FR series, four groups of animals were compared: non-treated control (C) and arthritic (AA) rats, both with free access to food and water, and two analogous groups with a 40% food restriction-FR and AA-FR. All animals were killed 22 days after injection of cFA. In the PS series, stress was induced by random daily exposures of the rats to isolation, over-crowding, food/water deprivation, foot shock, tilting, fear for 14 days before cFA injection and 12 days thereafter (groups: C, AA, PS, and AA-PS). Arthritis causes swelling of the hindpaw, which was prevented in the AA-FR group. PS causes more severe disease symptoms: AA-PS rats had more severe hindpaw swelling than AA rats. Forty percent food restriction associated with elevated CORT levels mitigated inflammatory parameters activated during AA. PS worsened the disease. These results suggested that activated CORT is not the only cause of disease suppression, but some metabolic changes during FR play a role.
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Affiliation(s)
- J Seres
- Department of Normal, Pathological, and Clinical Physiology, Third Faculty of Medicine, Charles University, Ke Karlovu 4, 12000 Prague, Czech Republic.
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Jurcovicova J, Stanciková M, Svík K, Krsova D, Seres J, Rokyta R. Stress of chronic food restriction attenuates the development of adjuvant arthritis in male Long Evans rats. Clin Exp Rheumatol 2001; 19:371-6. [PMID: 11491491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
OBJECTIVE To study the effect of the stress of chronic food restriction on the development of adjuvant arthritis in Long Evans male rats. METHODS Four groups of animals were compared: non-treated control (C) and arthritic (AA) rats, both with free access to food and water and two analogous groups with a 40% food restriction, i.e. non-treated (FR) and arthritic (AA-FR) animals. All rats were killed 22 days following the injection of complete Freund's adjuvant. The parameters measured were: serum levels of albumin (ALB), nitrate, glucose, insulin, corticosterone (CORT), prolactin (PRL) and PRL mRNA in the adenopituitaries. In addition the activity of gamma-glutamyl transpeptidase (GGTP) was measured in the spleen. The pain threshold was determined by the tailflick method. The body weight of the animals was recorded on day 0, 3, 7, 11, 15 and 18 of the disease. RESULTS Arthritis caused swelling of the hind paw (2.37 +/- 0.15 ml vs 1.1 +/- 0.05ml in controls, p < 0.01) which was prevented in the AA-FR group (1.44 +/- 0.13 ml, not significant against controls). Arthritis increased serum NO and reduced ALB levels; both changes were significantly restored in the FR-AA group. Food restriction did not alter the activation of GGTP, or the decrease of PRL mRNA observed in the AA group. Serum CORT was elevated in rats with food restriction (15.49 +/- 2.1 vs. 3.7 +/- 0.87 microg/dL) and remained enhanced to the same extent in AA and FR-AA groups. The tailflick latency prolonged in the AA group was reduced by food restriction. CONCLUSION These results show that 40% food restriction associated with elevated CORT levels mitigated the inflammatory parameters activated during AA.
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Affiliation(s)
- J Jurcovicova
- Department of Normal, Pathological and Clinical Physiology, Third Faculty of Medicine of Charles University, Prague, Czech Republic.
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Hebling J, Zhang XP, Giessen H, Kuhl J, Seres J. Pulse characteristics of an optical parametric oscillator pumped by sub-30-fs light pulses. Opt Lett 2000; 25:1055-1057. [PMID: 18064271 DOI: 10.1364/ol.25.001055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We obtained nearly transform-limited light pulses of 34 fs near 1.2 microm by pumping an optical parametric oscillator with a 2-mm-long KTP crystal by 26-fs pulses from a Ti:sapphire laser. The average power of the pulses that were obtained was greater than 50 mW, at an 80-MHz repetition rate. Attempts to downscale the pulse duration by decreasing the pump-pulse duration revealed remarkable limitations of the attainable pulse length for sub-30-fs pump pulses, in accordance with a recent theoretical study [J. Opt. Soc. Am. B 17, 741 (2000)].
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Abstract
Legionnella often causes systemic manifestations. The clinical spectrum now includes cardiac legionnellosis. The first case of pericardial effusion was reported in September, 1981. To date, few additional cases have been reported. We hereby report a case of asymptomatic pericardial effusion with simultaneous pulmonary involvement. Pericardial involvement, if sought, would probably be more frequent than supposed in Legionnaires' disease.
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Affiliation(s)
- C Domingo
- Pneumology Service, Badalona Hospital, Barcelona, Spain
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Seres J, Náray-Szabó G, Simon K, Dakóczi-Csuka K, Szilágyi I, Párkányi L. Through-space electrostatic control in a novel regiospecific ring transformation of 1,3,4-trisubstituted maleimides. Tetrahedron 1981. [DOI: 10.1016/s0040-4020(01)92096-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Schneider HR, Stadler PA, Stütz P, Troxler F, Seres J. [Synthesis and properties of bromocriptine (author's transl)]. Experientia 1977; 33:1412-3. [PMID: 923690 DOI: 10.1007/bf01918774] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The bromination of alpha-ergokryptine, a genuine ergot alkaloid of the peptide type, in position 2 of the indol nucleus to 2-bromo-alpha-ergokryptine is described. Its transformation to the methanesulfonate led to the prolactin inhibitor bromocriptine-methanesulfonate, Parlodel.
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Hardegger E, Rostetter C, Seres J, Andreatta R. [Wilting agents and antibiotics. I. On the synthesis of anhydro-lycomarasminic acid]. Helv Chim Acta 1969; 52:873-80. [PMID: 5798939 DOI: 10.1002/hlca.19690520402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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