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SUMMARY:IEM Distinguished Lecturers Seminar: High-power ultrafast THz move
 s into the Terahertz domain
DTSTART:20231013T131500
DTEND:20231013T140000
DTSTAMP:20260924T120921Z
UID:c0489eebf600a3f4fe22f2aed95d9287d9ea2d4769006ea3e1659edb
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Clara Saraceno\nPhotonics and Ultrafast Laser Science Gr
 oup\, Electrical Engineering and Information Technology\, Ruhr University 
 Bochum\, Germany\nThe seminar will take place in ELA 2 and will be simulta
 neously broadcasted in the main auditorium in Neuchâtel Campus (MC A1 2
 72).\n\nCoffee and cookies will be served at 13:00 before the seminar\, in
  front of the two auditoriums. \n\nAbstract\nTerahertz Time Domain Spectr
 oscopy (THz-TDS) has become a ubiquitous tool in many scientific fields an
 d is also increasingly deployed in industrial settings. While these system
 s become more and more mature\, efficient and lab-based THz generation met
 hods combining broad bandwidth and high dynamic range (e.g.\, as provided 
 by high THz average power and correspondingly high repetition rate) remain
  rare. Most industrial THz-TDS systems make use of semiconductor-based pho
 toconductive emitters and receivers. These systems offer record-high dynam
 ic range operation at very high repetition rates of hundreds of MHz\, and 
 the corresponding emitters provide high conversion efficiencies with low p
 ower excitation\, driven by compact ultrafast fiber-lasers. For applicatio
 ns where strong-fields are desired\, the most commonly used technique is o
 ptical rectification in nonlinear crystals\, for instance zinc telluride (
 ZnTe)\, gallium phosphide (GaP)\, lithium niobate (LiNbO3) or organic crys
 tals (e.g.\, BNA\, DAST\, DSTMS). Whereas all these techniques have seen c
 ontinuous performance progress in the last few years driven by different a
 pplication fields\, their average power has mostly remained low. A promisi
 ng yet poorly explored route is simply to increase the average power of th
 e driving lasers using state-of-the-art\, high-average power ultrafast Yb-
 gain based lasers providing multi-100-W to kilowatt average-power levels a
 s excitation sources\, which are increasingly available both in laboratory
  setting and commercially. This new excitation regime for THz generation i
 n various schemes has become an active area of research in the last few ye
 ars\, and current results have allowed to reach power levels in the THz do
 main in the multi-ten to multi-hundred milliwatts in different repetition 
 rate regions – which was previously restricted to accelerator facility-t
 ype THz sources. This progress opens the door to a multiplicity of new and
  old research areas to be re-visited. In this presentation\, we review rec
 ent progress in the generation of high-average power THz for TDS. We will 
 present the state-of-the-art of high-power ultrafast laser sources with po
 tential for driving THz sources\, current technological challenges in scal
 ing THz average power\, and applications areas that could potentially bene
 fit from these novel lab-based sources.\n\n\nBio\nClara Saraceno is a full
  professor at the Ruhr University Bochum\, Germany. She was born in 1983 i
 n Argentina.  In 2007 she completed a Diploma in Engineering and an MSc a
 t the Institut d’Optique Graduate School\, Paris France. She first worke
 d as an engineering trainee at Coherent Inc. Santa Clara\, California\, un
 til 2008. She then completed a PhD in Physics at ETH Zürich in 2012 where
  she carried out research on high-power ultrafast disk lasers. From 2013-2
 014\, she worked as a Postdoctoral Fellow at the University of Neuchatel a
 nd ETH Zürich\, Switzerland\, where she worked on high-flux XUV generatio
 n via high harmonics generation. In 2016\, she received a Sofja Kovalevska
 ja Award of the Alexander von Humboldt Foundation and became Associate Pro
 fessor of Photonics and Ultrafast Science in the Electrical Engineering Fa
 culty at the Ruhr University Bochum\, Germany\, followed by a full profess
 orship in the same university since 2020.\n\nResearch Interests: Clara’
 s research interests are in the development of high-power ultrafast laser 
 systems and their application in driving secondary sources via nonlinear o
 ptics. One of her current main research areas is THz technology and spectr
 oscopy\, where her group aims to achieve high average power level broadban
 d THz radiation.\n\nProfessional Activities and Awards: Clara has co-auth
 ored more than 60 journal publications in highly ranked journals and given
  numerous invited\, keynote and plenary talks at international conferences
 . She served in numerous committees for international conferences\, includ
 ing general chair for CLEO US 2023\, ASSL 2022 and Ultrafast Optics Confer
 ence in Argentina in 2023. She was previously an associate editor for Opti
 cs Express in 2019 – 2021 and is now associate Editor at APL Photonics.\
 nClara has received a number of prizes and awards including the ETH Medal 
 for Outstanding PhD thesis (2013)\, the European Physical Society Quantum 
 Electronics and Optics Division PhD prize in applied aspects (2013)\, the 
 Sofja Kovalevskaja Award of the Alexander von Humboldt (2016) and an ERC S
 tarting Grant (2018). She was elected Optica Fellow in the 2022 class.\n 
LOCATION:ELA 2 https://plan.epfl.ch/?room==ELA%202 https://epfl.zoom.us/j/
 66144079474
STATUS:CONFIRMED
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