Conference Agenda

Session
TOM13 S01: Ultrafast: New trends in ultrafast photonics
Time:
Monday, 13/Sept/2021:
8:15 - 10:30

Session Chair: Lucile Rutkowski, Institute of Physics of Rennes, France
Location: Aula 1

1st floor

Presentations
8:15 - 8:45
Invited
ID: 391 / TOM13 S01: 1
TOM 13 Ultrafast Optical Technologies and Applications

Machine learning: a new tool for ultrafast photonics applications

Goery Genty

Tampere University, Finland

In this talk, we review the recent developments in machine learning applications to ultrafast photonics with emphasis on the study of complex dynamics and transient instabilities.



8:45 - 9:00
ID: 430 / TOM13 S01: 2
TOM 13 Ultrafast Optical Technologies and Applications

Neural network prediction of supercontinuum generation dynamics

Lauri Salmela1, Mathilde Hary1,2, John M. Dudley2, Goëry Genty1

1Tampere University, Finland; 2Institut FEMTO-ST, Université Bourgogne Franche-Comté CNRS UMR 6174, France

We introduce a new approach based on two neural network architectures for mimicking the nonlinear propagation dynamics of ultrashort pulses in optical fibers for supercontinuum generation, allowing for significant memory and speed improvements compared to the conventional approach of numerically integrating the generalized nonlinear Schrödinger equation.



9:00 - 9:15
ID: 168 / TOM13 S01: 3
TOM 13 Ultrafast Optical Technologies and Applications

Robust self-referenced Generator of programmable multi-millijoule terahertz-rate Bursts

Vinzenz Stummer1, Tobias Flöry1, Edgar Kaksis1, Audrius Pugzlys1,2, Andrius Baltuska1,2

1TU Wien, Austria; 2Center for Physical Sciences & Technology, Lithuania

We demonstrate a technique for the programmable generation and multi-millijoule amplification of ultrashort pulse bursts, which can be applied to any master-oscillator regenerative-amplifier system with very low implementation complexity and high stability in burst-mode operation.



9:15 - 9:30
ID: 329 / TOM13 S01: 4
TOM 13 Ultrafast Optical Technologies and Applications

Mid-infrared laser filaments for local modification of atmospheric aerosol densities

Valentina Shumakova1,2, Elise Schubert3, Skirmantas Alisauskas1, Denis Mongin3, Mary Mattews3, Tadas Balciunas3, Audrius Pugzlys1,4, Jerome Kasparian3, Andrius Baltuska1,4, Jean-Pierre Wolf3

1Photonics Institute, TU Wien, Austria; 2University of Vienna, Faculty of Physics, Faculty Center for Nano Structure Research, Christian Doppler Laboratory for Mid-IR Spectroscopy and Semiconductor Optics, Austria; 3GAP, Université de Genève, Switzerland; 4Center for Physical Sciences & Technology, Lithuania

Laser-Induced Aerosol Formation (LIAF), driven by UV and near-IR filaments, relies on the nitrogen photo-oxidative chemistry, triggered by photoionization and leading to the production of HNO3, stabilizing the growth of aerosol. Mid-IR filaments were expected to be less efficient due to their lower photoionization rates. However, we observed surprisingly high yields of aerosols, generated by mid-IR laser pulses, which cannot be fully explained by the HNO3-pathway. Therefore, we suggest a new mechanism of LIAF, based on the resonant excitation of volatile organic compounds, enabled by the spectral broadening during filamentation.



9:30 - 9:45
ID: 392 / TOM13 S01: 5
TOM 13 Ultrafast Optical Technologies and Applications

Ultrafast pulse-shaping modulates perceived visual brightness in living animals

Geoffrey Gaulier1, Quentin Dietschi2, Swarnendu Bhattacharyya3, Cedric Schmidt1, Matteo Montagnese1, Adrien Chauvet1, Sylvain Hermelin1, Florence Chiodini4, Luigi Bonacina1, Pedro L. Herrera5, Ursula Rothlisberger3, Ivan Rodriguez2, Jean-Pierre Wolf1

1Group of Applied Physics, University of Geneva, Switzerland; 2Department of Genetics and Evolution, University of Geneva, Switzerland; 33Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, Switzerland; 4Biobanque de tissus thérapeutiques, Department of Diagnostic, University Hospitals of Geneva, Switzerland; 5Department of Genetics Medicine and Development, University of Geneva

Experiments on molecules in solution showed that the first step of vision consists in an ultrafast photo-isomerization that can be coherently controlled by femtosecond pulse shaping. Here, we measure the electric signals fired from the retina of living mice upon femtosecond multi-pulse and single-pulse visual stimulation. We show that the electrophysiological response is sensitive to the manipulation of the pulse spectral-phase and the control mechanism relies on multiple interactions in proximity of the conical intersection, leading to pump-dump and pump/re-pump processes. Our interpretation is supported by quantum dynamics simulations.



9:45 - 10:00
ID: 449 / TOM13 S01: 6
TOM 13 Ultrafast Optical Technologies and Applications

Long distance laser filamentation using Yb:YAG kHz laser

Pierre Walch1, Benoît Mahieu1, Magali Lozano1, Yves-Bernard André1, Laurent Bizet1, Ugo Andral2, Victor Moreno2, Thomas Produit2, Clemens Herkommer3, Robert Bessing3, Thomas Metzger3, Jerôme Kasparian2, Jean-Pierre Wolf2, André Mysyrowicz1,4, Aurélien Houard1

1Laboratoire d’Optique Appliquée – ENSTA, Ecole Polytechnique, CNRS - 828 boulevard des Maréchaux, 91762 Palaiseau, France; 2Groupe de Physique Appliquée, Université de Genève, Ch. de Pinchat 22, 1211 Geneva 4, Switzerland; 3TRUMPF Scientific Lasers GmbH + Co. KG, Feringastr. 10a, 85774 Unterföhring, Germany; 4André Mysyrowicz Consultants, 6 Rue Gabriel, 78000 Versailles, France

In the framework of the Laser Lightning Rod project, we study over 140 m the filaments created by a laser system with J-range pulses of 1 ps duration at 1 kHz repetition rate. We investigate the spatial evolution of the multiple filamentation regime and its ability to control high-voltage discharges at different distance. The measurements were made using both a collimated beam and a focused beam.



10:00 - 10:15
ID: 410 / TOM13 S01: 7
TOM 13 Ultrafast Optical Technologies and Applications

On-demand ultrafast soliton molecules through genetic algorithm optimization

Jérémie Girardot, Aurélien Coillet, Franck Billard, Malik Nafa, Edouard Hertz, Philippe Grelu

Laboratoire ICB, France

Our work contributes to integrate artificial intelligence into laser devices to make them versatile, adaptable and programmable. Within a fiber laser cavity, we incorporate interfaced liquid-crystal components driven by an evolution algorithm that optimizes merit functions leading to user-defined mode-locked regimes. To illustrate the possibility to generate on-demand complex ultrashort-pulse dynamics, we demonstrate the generation of 2-soliton molecules with pre-determined temporal separation.