3:30pm - 4:00pmINVITEDWavefront Shaping for High-Power Multimode Fiber Amplifier With Controlled Output and Nonlinearity Mitigation
Stefan Rothe1,2, Chun-Wei Chen1,3, Peyman Ahmadi1,4, Kabish Wisal5, Mert Ercan1, KyeoReh Lee1, Nathan Vigne1, A. Douglas Stone5, Hui Cao1
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 - 4:15pmStudy of tapered microfibers by line-field confocal optical coherence tomography
Arnaud Dubois, Sylvie Lebrun
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 - 4:30pmClassical light thermalization toward negative temperature equilibrium states in optical fibers and extension to the quantum regime
Lucas Zanaglia1, Kilian Baudin2, Josselin Garnier3, Adrien Fusaro4, Claire Michel1, Valérie Doya1, Guy Millot2, Antonio Picozzi2
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 - 4:45pmValidation of optical fibre-based SHM for composite aircraft structures using a building block approach
Sidney Goossens1,2, Miguel Jiménez3, Evangelos Karachalios4, María Mora Mendías5, Zahra Sharif Khodaei6, Francis Berghmans1,2
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 - 5:00pmSwitchable L-band fiber ring laser driven by a motorized polarization fiber controller
Iñaki Janices1, Alvaro Salinas1, Maria Jose Erro1,2, Santiago Tainta1,2, Rosa Ana Perez-Herrera1,2
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.
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