ELFT HÍRADÓ

[Zimányiné Horváth Vera <Vera.Horvath AT eli-alps.hu>]

Előadó:               Varró Sándor (ELI ALPS)
Cím:                     Attosecond light pulses and electron pulses


Helyszín:             az ELI ALPS konferenciaterme (Szeged, Wolfgang Sandner 
utca 3.)
Időpont:             2023. október 18., 14 óra

Az előadás rövid összefoglalója:

In the very first issue of the ELI Courier in 2009 there appeared an 
interview [1] with Prof. Gy. Farkas, in which they asked him about 
occasionally being called “the father of attophysics”. He modestly declined, 
by saying that “I must attribute this romantic denomination to the numerous 
years that have passed, rather than to real merit.” Certainly he would have 
been very happy to see the recent announcement of the Nobel Prize in Physics 
2023 [2], since he had very much appreciated the results of the recent 
Laureates. In particular, he had a long-standing, and fruitful collaboration 
with Prof. P. Agostini during decades, who has always given a proper credit 
to the first proposal in 1992 by Farkas and Tóth [3] for attosecond light 
pulse generation.
In the present talk we shall discuss examples from the huge set of Prof. 
Farkas’ important results, concerning photon correlations [4], multiphoton 
photoeffect [5], Keldish tunneling, above-threshold ionization [6], [7], and 
high-harmonic generation [8], with some associated and still open questions.

*The present talk is dedicated to the memory of Prof. Dr. Győző Farkas 
(1933-2020), on the occasion of the 90th anniversary of his birthday. Prof. 
Farkas had significantly contributed to the research on multiphoton processes 
and played an important role in the early development of attosecond physics.

References.
[1] Interview on pages 6-7, ELI Courier Volume 1 No 1 September 2009 (ISSN 
2041-9023, IOP Publishing). The central part of the interview is quoted here. 
Answer to the interviewer by Gy. F. > I must attribute this romantic 
denomination to the numerous years that have passed, rather than to real 
merit. Actually, back then I began to study experimentally fundamental 
phenomena, like the unusually broad widths of above-threshold ionization and 
high harmonic generation light spectra. Even for an experimentalist like me, 
the reciprocals of these widths immediately suggested the occurrence of 
attosecond-duration light and electron pulses. While this idea was mostly 
rejected by the community for a decade, later – after its first experimental 
verification – it became generally accepted and was declared “evident”. It is 
a pleasure to see how this Hungarian-born idea induced an enormous number of 
new experiments on atomic-scale electron motion, establishing attoscience.<
[2] >The Royal Swedish Academy of Sciences has decided to award the Nobel 
Prize in Physics 2023 to Pierre Agostini, Ferenc Krausz and Anne L’Huillier 
“for experimental methods that generate attosecond pulses of light for the 
study of electron dynamics in matter”. < 
https://www.nobelprize.org/prizes/physics/2023/press-release/
[3] Farkas Gy and Tóth Cs 1992 Proposal for attosecond light pulse generation 
using laser induced multiple-harmonic conversion processes in rare gases. 
Physics Letters A 168, 447-450 (1992).
[4] Farkas Gy, Jánossy L, Náray Z and Varga P 1964 Intensity correlation of 
coherent light beams, Acta Physica Hungarica 18, 199‐212 (1964).
[5] Farkas Gy 1978 Multiphoton phenomena in photoelectron emission of metals 
at high laser intensities. In Multiphoton Processes, edited by J. H. Eberly 
and P. L. Lambropoulos (Wiley, New York, 1978). [5b] Farkas Gy, Chin S L, 
Galarneau P and Yergeau F 1983 A new type of intense CO2 laser induced 
electron emission from a gold surface. Opt. Comm. 48, 275 (1983). [5c] 
Charalambidis D, Hontzopoulos E, Fotakis C, Farkas Gy, and Tóth Cs 1989 High 
current, small divergence  electron beams produced by laser-induced surface 
photoelectric effect. J. Appl. Phys. 65, 2843 (1989).
[6] Farkas Gy, Tóth Cs, Kőházi-Kis A, Agostini P, Petite G, Martin Ph, Berset 
J M and Ortega J M 1998 Infrared electron photoemission from a gold surface. 
J. Phys. B: 31, L461-L468 (1998).
[7] Varró S and Farkas Gy 2008 Attosecond electron pulses from interference 
of above-threshold de Broglie waves. Laser and Particle Beams 26, 9-19 (2008).
[8] Farkas Gy, Tóth Cs, Moustaizis S D, Papadogiannis N A, and Fotakis C 1992 
Observation of multiple-harmonic radiation induced from a gold surface by 
picosecond neodymium-doped yttrium aluminium garnet laser pulses. Phys. Rev. 
A 46, R3605-R3608 (1992).

Az előadás online is követhető, a következő link használatával:
https://teams.microsoft.com/l/meetup-join/19%3ameeting_NmEwYjNmZmYtYzY1YS00MWEzLWI2NmItN2Q1OGZiYWNlOGQ0%40thread.v2/0?context=%7B%22Tid%22%3A%22b207389a-c5cb-4cb0-a1ad-227b94e96448%22%2C%22Oid%22%3A%22c993efcb-59ae-4652-9f68-d7a313727128%22%2C%22IsBroadcastMeeting%22%3Atrue%2C%22role%22%3A%22a%22%7D&btype=a&role=a

A szeminárium angol nyelvű. Minden érdeklődőt szívesen látunk.

ZIMÁNYINÉ HORVÁTH Vera
Látogatóközpont-vezető

ELI ALPS, ELI-HU Non-Profit Ltd.
H-6728 Szeged, Wolfgang Sandner utca 3.
Mobil: +36 70 491 14 12
E-mail: Vera.Horvath AT eli-alps.hu<http://Vera.Horvath AT eli-alps.hu/>
Honlap: www.eli-alps.hu<http://www.eli-alps.hu/>
[cid:image001.png AT 01DA0006.27686DD0]

P Kérem, óvja a természetet, ha nem szükséges, ne nyomtassa ki ezt az e-mailt!
Before printing, think about ENVIRONMENTAL responsibility.