| Session | ||
TOM13 S01: Ultrafast: New trends in ultrafast photonics
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| 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 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 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 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 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 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 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 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. | ||