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セミナーのお知らせ: Professor Oleg Pronin (Helmut Schmidt University, Hamburg, Germany)
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日時：２０２３年１２月７日（木）14:00～15:00
場所：東京大学理学部1号館3階340号室 および ZOOM（どちらも事前登録制）
講演者： Oleg Pronin 氏
(Helmut Schmidt University, Hamburg, Germany, Professor)
講演題目: Nonlinear optics in multipass cells
Abstract
Reliable industrial femtosecond lasers are based on a Yb-doped laser gain medium with an output pulse duration from 200 to 1000 fs. These output pulses can be further broadened and compressed to the range of 7-100 fs, depending on the application. In this talk, I report on the compression method involving new technology, free-space multipass cells. Moreover, the application of the multipass cells is not limited only to spectral broadening and compression. The multipass cells are a foundation of χ(3) multipass nonlinear optics [1,2], a small emerging sub-field of nonlinear optics. This talk will address the recent developments in this field, including further peak and average power scalability towards sub-Joule energies and kW-level average power and pulse compression from 250 fs down to 7 fs.
Additionally, I will describe our very recent development on χ(2) multipass nonlinear optics [3]. Here, I will report on a new approach to the quasi-phase matching of nonlinear materials based on the free space multipass cells. The method applies to all nonlinear crystals with non-zero susceptibility χ(2), and can, for example, phase match such materials as crystalline quartz.
[1] M. Hanna et al., Laser & Photonics Reviews, 15, 2100220 (2021).
[2] S. Goncharov et al., Opt. Lett. 48,147?150 (2023).
[3] N. Kovalenko et al., arXiv.2209.06207.
Biography
Oleg Pronin was born in Ertil, Russia, in 1985. He received a Diploma degree in solid-state physics from Moscow Engineering Physics Institute in 2008, and a Ph.D. degree in physics from the Ludwig Maximilian University of Munich, Germany, in 2012.
From 2012 to 2014, he was a Postdoctoral Scientist at the Ludwig Maximilian University of Munich. From 2014 to 2019, he was a Group Leader with Prof. Dr. Ferenc Krausz at the Max Planck Institute of Quantum Optics, Garching, Germany. Since 2019, he is a full professor at Helmut Schmidt University in Hamburg, Germany. He co-authored over 30 articles and holds several patents. He is a co-founder of n2-Photonics.
使用言語：English/英語
紹介教員：井手口 拓郎
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