ELFT HÍRADÓ

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

Időpont:              2025. április 04., 10:30
Helyszín:             az ELI ALPS konferenciaterme (Szeged, Wolfgang Sandner 
utca 3.)


  1.  Előadó:              Hiromitsu Kiriyama – Kansai Institute for Photon 
Science, Japan (https://www.qst.go.jp/site/kansai-dapr-english/alsge.html)

Cím:                   Ultra-intense Ti:sapphire laser technology for high 
field science



Absztrakt:
We report on our petawatt J-KARN-P laser facility based on an 
OPCPA/Ti:sapphire hybrid architecture and focused intensities of 1022 W⁄cm2 
on target at a 0.1 Hz repetition rate. At such extremely high intensities of 
1022 W⁄cm2, to minimize pre-plasma formation on solid targets, we have 
experimentally investigated the temporal contrast enhancement techniques.
Firstly, the origins of pre-pulses generated by post-pulses were identified 
and the elimination of most pre-pulses by removal of the post-pulses with 
wedged optics was achieved.
Secondly, we demonstrate orders of magnitude enhancement of the picosecond 
pedestal contrast improving the surface quality of the convex mirror in the 
Öffner stretcher.
Thirdly, we have examined the temporal contrast characteristics of a double 
chirped-pulse amplification (CPA) laser, in particular the pre-pulses created 
by post-pulses coming from the first CPA stage at the front-end. We develop a 
cascaded femtosecond optical parametric amplifier based on the utilization of 
the idler pulse rather than the signal pulse for the complete elimination of 
the remaining pre-pulses and the sum-frequency mixing of the signal and idler 
of the OPA.
Fourthly, a single plasma mirror is installed in the J-KAREN-P laser beamline 
for further contrast improvement of three orders of magnitude. The above 
developments indicate that although it has not been directly measured, the 
contrast can be as high as approximately 1015 up to 40 ps before the main 
pulse. We are planning to upgrade the plasma mirror, and hope to achieve a 
further approximately three orders of magnitude improvement in contrast 
(toward 1018) over the current single plasma mirror configuration by using a 
double plasma mirror configuration.
Finally, we briefly show the introduction of some applications with the 
J-KAREN-P laser and an overview of the digital transformation (DX) of the 
system, enabling remote and automated operation of the J-KAREN-P laser 
facility. We also present the demonstration of the highest terawatt-class 
pulse with a passive coherent beam combining with Sagnac Interferometer.


  1.  Előadó:              Hyyong Suk – Gwangju Institute of Science and 
Technology, Korea (https://laser.gist.ac.kr/physeng/14580.do)

Cím:                   Laser-plasma research activities at GIST, Korea



Absztrakt:
GIST (Gwangju Institute of Science and Technology) is a research-oriented 
university in Korea, governed by the Ministry of Science and Technology. We 
have a few high power laser systems of 4 PW, 150 TW and 20 TW on the campus. 
They are used for diverse research purposes, including particle (electron and 
proton) acceleration, generation of gamma rays and THz radiations, etc. In 
this talk I shall give an overview of our research activities at GIST.

A szeminárium angol nyelvű. Minden érdeklődőt szívesen látunk, de az 
előadások online is meghallgathatók az alábbi linken:
https://teams.microsoft.com/l/meetup-join/19%3ameeting_NTFkZWUzNmItMTNiNi00ZTk5LWIyMDctZTI1OGM0ZDQ2ZTlm%40thread.v2/0?context=%7b%22Tid%22%3a%22b207389a-c5cb-4cb0-a1ad-227b94e96448%22%2c%22Oid%22%3a%22c993efcb-59ae-4652-9f68-d7a313727128%22%7d

Üdvözlettel:
Horváth Vera

ZIMÁNYINÉ HORVÁTH Vera
Látogatóközpont-vezető
Tel: +36 70 491 14 12
Email: vera.horvath AT eli-alps.hu<mailto:vera.horvath AT eli-alps.hu>

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