Marina Fernández Galán from the Laser and Photonics Applications Group and the LUMES Excellence Unit at the University of Salamanca will give a seminar titled “Colliding Pulses: A Route to Generating Ultrashort Pulses in the Ultraviolet” on February 21 at 1:00 PM.
The seminar will take place in Room V of the Trilingual Building at the University of Salamanca.
Víctor W. Segundo Staels from the Laser and Photonics Applications Group and the LUMES Excellence Unit at the University of Salamanca will give a seminar titled ‘Understanding the Space-Spectral Homogeneity in Multipass Cells’ on February 11 at 1:00 PM.
The seminar will take place in Room III of the Trilingual Building at the University of Salamanca.
Sandra Gómez, from the Department of Chemistry at the Autonomous University of Madrid, will deliver the seminar titled “Quantum dynamics of excited states in simplified graphene systems” on February 4 at 12:00.
The seminar will take place in Room VII of the Trilingual Building at the University of Salamanca.
Marcos García Barriopedro, from the Complex Systems group at the Polytechnic University of Madrid, will deliver the seminar titled “Quantum Zeno effect and Zeno dynamics: application to particle teleportation and its optical implementation” on December 5 at 12:00.
The seminar will take place in Room IV of the Trilingual Building at the University of Salamanca.
This talk is part of the visit of Marcos García-Barriopedro, Isabel Gonzalo, and Miguel Ángel Porras within the framework of the FASLIGHT network (Fundamental and Applications of Structured Light), a Spanish network dedicated to the study of structured light.
FASLIGHT (RED2022-134391-T) is supported by the Ministry of Science and Innovation and the State Research Agency (MCIN/AEI / 10.13039/501100011033).
Elsa Abreu, from the Quantum Material Dynamics Institute for Quantum Electronics at ETH Zurich, will deliver the seminar titled “THz dynamics of quantum materials, also under pressure” on November 29 at 12:00.
The seminar will take place in Room IV of the Trilingual Building at the University of Salamanca.
Yago Radziunas Salinas, from the Photonics4Life group of the Department of Applied Physics at the University of Santiago de Compostela, will deliver the seminar titled “Laser structuring of devices for biological applications” on November 28 at 10:00.
The seminar will take place in the seminar room of the Laboratories in the Trilingual Building at the University of Salamanca.
This talk is part of the visit of Yago Radziunas Salinas and María Teresa Flores Arias within the framework of the FASLIGHT network (Fundamental and Applications of Structured Light), a Spanish network dedicated to the study of structured light.
FASLIGHT (RED2022-134391-T) is supported by the Ministry of Science and Innovation and the State Research Agency (MCIN/AEI / 10.13039/501100011033).
Gonçalo Figueira from the Department of Physics & GoLP/IPFN at Instituto Superior Técnico in Lisbon (Portugal) will deliver a seminar titled “Ultrafast Laser Research at IST Lisbon” on October 24 at 1:00 p.m.
The seminar will take place in Room V of the Edificio Trilingüe at the University of Salamanca.
The seminar will take place in Classroom V of the Edificio Trilingüe at the University of Salamanca
Zhensheng Tao from the State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) at Fudan University in Shanghai (P.R. China), will deliver a seminar titled “Solid-state High-order Sideband Spectroscopy and Microscopy” on July 23rd at 12:00 PM.
The seminar will take place in Classroom VII of the Trilingual Building at the University of Salamanca.
Abstract
Ultrafast manipulation of electronic states in quantum materials is essential for quantum-state engineering and ultrafast optical modulation. Recently, strong-field driven materials have exhibited fascinating tailored properties, including modification of topological states, modulation of optical properties and band-structure engineering. However, experimental methods for accessing the properties of strong-field dressed quantum states are lacking. In this talk, I will present our recently developed high-order sideband spectroscopy and microscopy techniques, which enables energy-, time- and space-resolved measurements on strong-field dressed quantum states or near-field wave phenomena. We present the first measurement on the dephasing rates of strong-field dressed exciton states, and resolve the strong-field exciton dissociation as the major dephasing mechanism. Furthermore, we realize the first 3D tomographic near-field tomographic imaging of a mid-infrared anapole resonant field in a micrometer-thick silicon resonator. These results highlight the high-order sideband spectroscopy and microscopy as a powerful tool for studying ultrafast manipulation of quantum materials.
Figure (a) Illustration of measuring the exciton dephasing rates using high-order sideband spectroscopy. (b) Illustration of imaging near-field distribution in dielectric optical resonators.
Raoul Trines from STFC Rutherford Appleton Laboratory in Didcot (United Kingdom) will deliver the seminar titled “Laser Harmonic Generation: A Beat Wave on Steroids” on July 11th at 12:00 PM.
The seminar will take place in room VII of the Trilingual Building at the University of Salamanca.
The laser beat-wave concept was developed in the 1980s to generate waves in low-density plasma using dual-frequency lasers. In this process, sidebands are generated in the electromagnetic wave spectrum. In this talk, we show that the beat-wave concept can also be used to study laser harmonic generation for both Gaussian beams and higher-order laser modes (e.g., Laguerre-Gaussian).
We present a novel framework to study laser harmonic generation, considering it as a multi-dimensional beat-wave process [1]. This framework allows us to calculate and visualize harmonic progressions more easily. It also includes a specific way to simultaneously analyze the frequency, spin, and orbital angular momentum (OAM) content of the harmonic radiation, providing deeper insight into this process.
We will apply our framework to the interaction of laser pulses with structured targets and show that we can achieve tunable OAM spectra and frequency combs in this configuration. We will also use our methods to analyze harmonic generation in nonlinear optics involving higher-order phase and polarization topologies, thus demonstrating that our results have many applications beyond laser-solid interactions.
Top: Schematic illustrating the generation of higher order harmonics (blue: σ= 1; green: σ=−1) of an incoming CP pump pulse (red) in (a) reflection and (b) transmissive configurations, from a threefold structured target. Bottom: Expected 2D harmonic spectrum from: (c), a flat target driven by a LP pump pulse with ℓ= 1; (d) a target with a circular structure hit by a CP pump pulse of ℓ= 0; and (e), a target with a threefold structure hit by a CP pump pulse of ℓ= 0). The blue shaded area indicates the potential for a frequency comb at ℓ= 0