| Session | ||
TOM Fibers S3: Characterisations
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| Presentations | ||
3:30pm - 4:00pm
INVITED Wavefront Shaping for High-Power Multimode Fiber Amplifier With Controlled Output and Nonlinearity Mitigation 1Department of Applied Physics, Yale University, New Haven, CT 06520, USA; 2Adaptive Quantum Optics, MESA+ Institute for Nanotechnology, University of Twente,7500 AE Enschede, The Netherlands; 3Edward L. Ginzton Laboratory, Stanford University, Stanford,CA 94305, USA; 4Coherent, 1280 Blue Hills Ave., Bloomfield, 06002, CT, USA; 5Department of Physics, Yale University, CT 06520, USA We propose an efficient method of mitigating Stimulated Brillouin Scattering in a single-frequency multimode fiber amplifier. By applying wavefront shaping to the continuous wave seed, we excite many modes in our Yb-doped multimode fiber amplifier reducing the backward propagating Stokes power. Simultaneously, we can control the output profile ensuring good beam quality. In the experiment, our multimode fiber amplifier achieves 503~W amplified signal power, its slope efficiency is 82~\%, the amplified signal has 18~kHz spectral linewidth and the propagation factor of the output beam is less than 1.35. 4:00pm - 4:15pm
Study of tapered microfibers by line-field confocal optical coherence tomography Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris-Saclay, France We present measurements of the evolution of the core and cladding diameters in tapered silica microfibers by LC-OCT. The results will help to refine the models of propagation of modes in tapers. 4:15pm - 4:30pm
Classical light thermalization toward negative temperature equilibrium states in optical fibers and extension to the quantum regime 1Université Côte d'Azur, Institut de Physique de Nice, Nice, France; 2Université de Bourgogne, Laboratoire Interdisciplinaire Carnot de Bourgogne, Dijon, France; 3CMAP, CNRS, École Polytechnique, Institut Polytechnique de Paris, Palaiseau, France; 4CEA, DAM, DIF, Arpajon, France We report the observation of classical light thermalization to the negative tem- perature Rayleigh-Jeans (RJ) equilibrium states. We extend theoretically these equilibrium states to the Bose-Einstein quantum regime (BE) through the anal- ysis of the thermodynamic properties. 4:30pm - 4:45pm
Validation of optical fibre-based SHM for composite aircraft structures using a building block approach 1Vrije Universiteit Brussel (VUB), Brussels Photonics (B-PHOT), 1050 Brussels, Belgium; 2Flanders Make, BP&M, 1050 Brussels, Belgium; 3Elements Materials Technology, Element Seville SL, 41300 Seville, Spain; 4Hellenic Aerospace Industry (HAI), ERDD, 32009 Schimatari, Greece; 5The Foundation for Research, Development and Application of Composite Materials (FIDAMC), E-28906 Getafe, Madrid, Spain; 6Imperial College London (ICL), Department of Aeronautics, 2AZ London, United Kingdom We demonstrate a building block validation strategy for structural health monitoring (SHM) of aerospace composite structures using optical fibre Bragg grating (FBG) sensors. Standard FBGs are surface-mounted for global strain monitoring, while microstructured FBGs (MOFBGs) are embedded to resolve directional and through-thickness strain. We validate this approach from coupon to fuselage scale. The sensors detect impact-induced damage, and their outputs are fused into a Global Damage Index (GDI) that quantifies structural integrity. We show that the sensor technologies and damage evaluation methods scale effectively across component size and complexity, offering a certified path toward embedded SHM in aerospace composites. 4:45pm - 5:00pm
Switchable L-band fiber ring laser driven by a motorized polarization fiber controller 1Dept. Electrical, Electronic and Communications Eng., Public University of Navarra, 31006, Spain; 2Institute of Smart Cities, Public University of Navarra, 31006 Pamplona, Spain In this work, a switchable multiwavelength L-band fiber ring laser based on a polarization-dependent booster optical amplifier (BOA) and a motorized polarization controller is experimentally demonstrated. Lasing wavelengths selection is achieved by automatically adjusting the polarization state, enabling single, dual, or triple line emission. | ||