TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices
TOM 7 - Thermal radiation and energy management
TOM 8 - Nonlinear and Quantum Optics
TOM 9 - Optics at Nanoscale (ONS)
TOM 10 - Optical Microsystems (OMS)
TOM 11 - Waves in Complex Photonic Media
TOM 12 - Optofluidics
TOM 13 - Ultrafast Optical Technologies and Applications
TOM 14 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session organised by SIOF
Grand Challenges of Photonics Session
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TOM13 S01: Ultrafast: New trends in ultrafast photonics
8:15 - 10:30
Session Chair: Lucile Rutkowski, Institute of Physics of Rennes, France
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
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.