The following seminar was held
Date and Time:Dec. 17, 2023 (Thu) 14:00-15:00
Venue: 場所：Room 340, 3rd Floor, Building 1, Faculty of Science, The University of Tokyo, and via ZOOM (Advance registration required for both)
Speaker:Professor Oleg Pronin (Helmut Schmidt University, Hamburg, Germany)
Title: Nonlinear optics in multipass cells
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.
Language: English
Host Professor: Takuro IDEGUCHI
Contact: sec-utripl@utripl.u-tokyo.ac.jp
Note: This seminar is open to the public. Participants are kindly requested to provide their name, affiliation, and email address upon registration.