Pedro Moronta from the Instituto de Ciencias Materiales de Madrid (ICMM), will give the seminar entitled “Random lasers: controlling their spectral persistence” on Friday, March 22 at 13:00.
The seminar will take place in room II of Edificio Trilingüe at Universidad de Salamanca.
Antonio Zelaquett Koury from the Fluminense Federal University in Brazil, will give the seminar entitled “Polarization controlled orbital angular momentum operations in nonlinear wave mixing” on January 17 at 12:30.0.
The seminar will take place in room VII of Edificio Trilingüe at Universidad de Salamanca.
Abstract: We investigate nonlinear wave mixing processes induced by transversely structured light beams. The interplay between different photonic degrees of freedom determines the structure of the fields generated by the nonlinear processes. In birefringent media, the nonlinear interaction can be directly affected by the polarization of the interacting beams. For example, in Type-II second harmonic generation, this interplay allows for polarization-controlled switching between different orbital angular momentum (OAM) operations. It can also be used for spin-to-orbital angular momentum transfer. Moreover, either in birefringent or isotropic media, a less intuitive interplay occurs between radial and angular degrees of freedom of paraxial modes undergoing nonlinear propagation. This radial-angular coupling leads to interesting chiral relationships that will be discussed.
Ignacio López Quintás from the research group in Laser Applications and Photonics (ALF) will give the seminar titled “Otra forma de mirar. Una nueva línea de investigación en Microscopía No Lineal” on December 18 at 1:00 p.m.
The seminar will take place in classroom VII of the Trilingual Building at the University of Salamanca.
Abstract: El desarrollo de la microscopía siempre ha buscado nuevas formas de observar la naturaleza para obtener información sobre objetos cada vez más pequeños. En esa búsqueda, surge la microscopía no lineal, que gracias al desarrollo de los pulsos láser ultracortos y ultraintensos permite observar la materia de una forma distinta. Esta técnica, gracias a su carácter confocal, permite estudiar muestras con una alta resolución espacial y proporciona información muy valiosa en campos como la biología. En el Grupo de Investigación en Aplicaciones del Láser y Fotónica de la USAL, hemos desarrollado recientemente una nueva línea de investigación basada en la microscopía no lineal. En esta charla se presentarán los conceptos básicos de esta técnica y los avances en el desarrollo de un microscopio no lineal construido íntegramente en nuestro laboratorio, así como los primeros resultados aplicados al estudio del microprocesado láser en cristales de gran interés en el campo de la Óptica
Miguel Ángel Porras from the Polytechnic University of Madrid will give the seminar titled “Theoretical advances in structured light with longitudinal and transverse orbital angular momentum” on November 29 at 1:00 p.m.
The seminar will take place in classroom IV of the Trilingual Building at the University of Salamanca.
Abstract: The control of ultrafast and strong field processes using structured light with orbital angular momentum (OAM) requires the most detailed knowledge of the physical properties of these light waves, and in particular, the amount of OAM carried by them and their propagation dynamics. While experiments of high harmonic and attosecond pulse generation with longitudinal OAM are made routinely in diverse experimental configurations, it is not yet completely clear the limits of the amount of OAM that the driving pulses can carry. Also, numerical studies of second and higher order harmonic generation using pulses with transverse OAM are being conducted, and experiments are planned, but at present there is a lack of knowledge about their propagation properties, and a hot debate on the amount of transverse OAM they carry, and hence transfer to the harmonics. In this talk recent theoretical developments aimed at clarifying these issues will be exposed.
Laura Rego from the Chemistry Department of the Autonomous University of Madrid, will give the seminar titled “Tailoring Light’s Polarization for Chiral Discrimination” on November 24 at 1:00 p.m.
The seminar will take place in room VII of the Trilingual Building at the University of Salamanca
Abstract: Chiral molecules are very relevant in many chemical and biological processes. For that reason, distinguishing between the two versions of a chiral molecule (enantiomers) is vital, but it is also challenging. In this talk, we will see several schemes to study chirality using ultrashort laser pulses with structured polarization. Our methods take advantage of light’s tailored polarization to create enantiosensitive interferences in the non-linear optical emission from the chiral molecules. First, we will show how to turn an ultrashort elliptical pulse into an efficient chiro-optical tool: by tilting its polarization plane towards its propagation direction. Second, we will introduce a different approach for efficient chiral recognition which relies on the interference between two low-order nonlinear processes: sum-frequency generation and third-harmonic generation. Finally, we will see how we can imprint chirality in atoms. In these theoretical proposals, the molecular handedness can be retrieved by all-optical measurements and in ultrafast time scales.
Carlos Trallero from the University of Connecticut will give the seminar titled “New regimes in ultrafast and strong field science” on November 3 at 10:00.
The seminar will take place in classroom D1 of the Faculty of Sciences at the University of Salamanca.
Marta Morales from the Holography and Optical Processing group of the University of Alicante, will give the seminar entitled “Holography for disruptive photovoltaic applications” on June 13 at 10:00.
The seminar will take place in room VII of the Trilingual Building at the University of Salamanca.
José Caridad from the Department of Applied Physics of the University of Salamanca and principal investigator of the CHIROTRONICS project (ERC Starting Grant 101039754), will give the seminar entitled “Detection of new chiral phenomena in nanomaterials” on June 9 at 09:00.
The seminar will take place in room VII of the Trilingual Building at the University of Salamanca.
Benoit Richard, researcher in the Hamburg University, will give the seminar entitled “Coulomb explosion as a potential new tool for the ultrafast imaging of single molecules” on February 24 at 12:00.
The seminar will take place in classroom VII of the Edificio Trilingüe at the University of Salamanca.
Rosa M. Martínez-Ojeda, predoctoral researcher in the University of Murcia, will give the seminar entitled “Microscopia multifotónica: donde cabe uno caben dos (o más)” on November 25 at 13:00.
The seminar will take place in classroom VII of the Edificio Trilingüe at the University of Salamanca.