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Speaker Bio:

Professor Oren Cohen received his PhD from Technion, on research done in the group of Mordechai Segev, then moved to postdoc position in JILA (joint institute of the University of Colorado at Boulder and the National Institute of Standards and Technology), to work with Profs. Margaret Murnane and Henry Kapteyn, and in 2008 returned to the Department of Physics at the Technion as a faculty member. Prof. Cohen's current research (theoretical and experimental), include symmetries and selection rules in nonlinear optics and their utilization for ultrafast spectroscopy, e.g. diagnostics of chirality, generation and applications of high harmonic generation with circular polarization, developing a microscope for high-resolution ultra-high-speed imaging of non-repetitive phenomena, diagnostics of ultrashort laser pulses, and strong-light quantum optics.

Prof. Cohen received several awards and fellowships, including the 2003 Israeli Physical Society outstanding Ph.D. student prize, a Rothschild post-doctoral fellowship (2005), Alon fellowship for outstanding young scientists in Israeli universities (2009-2011), Horev fellowship for Leaders in Science and Technology program at the Technion (2009-2011), the 2011 Wolf Foundation Krill Prize for Excellence in Scientific Research, the 2013 and 2020 Hershel Rich Technion Innovation award, the 2015 Henry Taub prize for academic excellence, and ERC consolidator grant (2019). In 2022 he was made a Fellow of the Optica Society (formally OSA, Optical Society of America) "For important contributions in nonlinear optics, including generation and applications of circularly-polarized high-order harmonics and observation of 3D spatiotemporal solitons".

Abstract:

For decades, high-harmonic generation (HHG) has been driven by classical laser light to generate useful extreme ultraviolet coherent radiation and attosecond pulses for investigating ultrafast phenomena in materials. It was largely assumed that the electron trajectories in this process are determined by the strong electric field amplitude that oscillates in time, while its quantum noise plays no role. I will present recent theoretical [1-4] and experimental [5] studies, demonstrating that quantum driving light alters the quantum and classical properties of HHG, e.g., leading to squeezed harmonics. The new formalism and experiments show that HHG exists even for driving light with noise so strong to nullify the field expectation values, such as bright squeezed vacuum.  

References:

1. Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., & Cohen, O. Photon-statistics force in ultrafast electron dynamics. Nature Photonics, 17, 501, 2023.

2. Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., & Kaminer, I. High-harmonic generation driven by quantum light. Nature Physics, 19, 1689, 2023.

3. Even Tzur, M., & Cohen, O. Motion of charged particles in bright squeezed vacuum. Light: Science & Applications, 13, 41, 2024

4. M. Even Tzur, M. Birk, A. Gorlach, M. Krüger, I. Kaminer and O. Cohen, Generation of squeezed high-order harmonics, Physical Review Research, 6, 033079 (2024),

5. Rasputnyi, A., Chen, Z., Birk, M., Cohen, O., Kaminer, I., Krüger, M., Seletskiy, D., Chekhova, M., & Tani, F. (2024). High harmonic generation by bright squeezed vacuum. Nature Physics, (2024)