3:30pm - 4:00pmINVITEDOptical fibre-based microdisplacement sensors fabricated using an ultrafast laser-assisted etching method
Rosa Ana Perez-Herrera1, Pablo Roldan-Varona2,3, Arturo Sanchez-Gonzalez1, Celia Gomez-Galdos2, Manuel Lopez-Amo1, Jose Miguel Lopez-Higuera2,4,5, Luis Rodriguez-Cobo2,4,5
1Dpt of Electrical, Electronic and Communications Engineering, and Institute of Smart Cities (ISC), Public University of Navarra, 31006, Spain; 2Photonics Engineering Group, University of Cantabria, 39005, Spain; 3Institute of Photonics and Quantum Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK; 4CIBER-BBN, Instituto de Salud Carlos III, 28029 Madrid, Spain; 5Instituto de Investigación Sanitaria Valdecilla (IDIVAL), Santander, Spain
Accurate displacement measurement is critical in areas such as structural health monitoring, bioengineering, and industrial or high-radiation environments. Optical fiber microdisplacement sensors offer significant advantages for these applications, including high precision, reliability, compact size, and flexibility. Their ability to operate under extreme conditions such as elevated temperatures, corrosive atmospheres, or high-pressure environments makes them ideal for integration into complex or confined systems.
This work presents the experimental analysis of single-mode optical fibers (SMFs) modified with transverse through-hole microchannels, fabricated using femtosecond laser processing combined with ultrafast laser-assisted etching. These structures have been experimentally demonstrated as micro-displacement sensing devices.
4:00pm - 4:15pmEnhancing the productivity in pulsed laser synthesis of nanomaterials and its applications
Francis Rey U. Cortes, Sergio Molina-Prados, Jesús Lancis, Eva Falomir, Carlos Doñate-Buendía, Gladys Mínguez-Vega
Universitat Jaume I, Spain
Pulsed laser synthesis (PLS) of nanomaterials in liquids is a promising technique for synthesizing high-purity nanoparticles. However, its industrial scalability is limited by low production rates. This contribution discusses strategies to enhance nanoparticle yield as accurate control of the temporal dispersion and spatial beam shaping. Additionally, we explore applications of PLS-derived nanoparticles.
4:15pm - 4:30pmFemtosecond pulsed laser ablation as a method to overcome resolution limits within 3D SLA prototyping in microfluidics
Yago Radziunas-Salinas1,3, Bastián Carnero1,3, Carmen Bao-Varela1,3, María Teresa Flores-Arias1,3, Bárbara Blanco-Fernández2,3, Ana Isabel Gómez-Varela1,3
1Photonics4Life Research Group, Applied Physics Department, Facultade de Física and Facultade de Óptica e Optometría, Universidade de Santiago de Compostela, E15782 Santiago de Compostela, Spain.; 2Department of Pharmacology, Pharmacy, and Pharmaceutical Technology, I+D Farma (GI-1645), Facultade de Farmacia, and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E15782 Santiago de Compostela, Spain; 3Instituto de Materiales (iMATUS), Universidade de Santiago de Compostela, E15782 Santiago de Compostela, Spain.
3D Stereolithography (SLA) technologies have emerged as a novel methodology to create a wide range of structures in the millimetric scale. Nevertheless, advancements in fields such as microfluidics or medicine rely on the creation of structures featuring micrometric resolution. SLA encounters resolution limits when printing objects within this range of sizes, especially when requiring hollow structures. On its side, femtosecond (fs) laser ablation emerges as a technique overcoming these limitations. The non-linear phenomena involved in the fs laser-matter interaction enable to perform a neat and precise extraction of material, resulting in a laser writing featuring microns. We propose a hybrid approach combining SLA and fs laser ablation to create a multi chamber microfluidic chip where micrometric substructures enable an accurate confinement of the samples.
4:30pm - 4:45pmMicro-precision additive manufacturing of copper powder using femtosecond laser pulses
Valentin Walter Leuthard, Bojan Resan, Manuel Zeyen
FHNW School of Engineering and Environment, Switzerland
Green and blue lasers have seen increased use in manufacturing of copper. They offer great advantages compared to common IR lasers especially in additive manufacturing. We tested the feasibility of a low average power femtosecond lasers at a centre wavelength of 515nm for use in micron-precision additive manufacturing of copper particles. A laser beam with an average power of 4W in the near IR was used to achieve second harmonic generation, and the resulting green beam was used to melt copper particles with sizes between 30 and 50µm. Melting of the powder was achieved and small two-dimensional structures were created.
4:45pm - 5:00pmUltra-Stable Broadband Comb Laser with Tunable Free Spectral Range and Spectra
Bahreh Marzban1, Lucius Miller1, Alexander Dikopoltsev1, Tobiias Blatter2, Laurenz Kulmer2, Mathieu Bertrand1, Giacomo Scalari1, Juerg Leuthold2, Jerome Faist1
1Institute of Quantum Optoelectronics, ETH Zurich, 8092 Zurich, Switzerland; 2Institute of Electromagnetic Fields (IEF), ETH Zurich, 8092 Zurich, Switzerland
We present a novel near-infrared broadband, flat-top optical
frequency comb spanning 1.6 THz. This comb is generated using an
interband gain medium operated in an ultrafast gain recovery regime within
a unidirectional ring cavity. The remarkable stability of our approach is
evidenced by a 1 Hz RF linewidth. The injected RF signal not only governs
the spectral bandwidth and free spectral range but also tailors the comb’s
spectral shape—a feat achieved by simultaneously injecting multiple
modulation tones. This advanced level of control opens promising avenues
for applications in communication, sensing, and ranging, where precise and
stable frequency lines are essential for performance and reliability
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