{"id":6116,"date":"2021-11-23T15:41:56","date_gmt":"2021-11-23T14:41:56","guid":{"rendered":"https:\/\/laser.usal.es\/alf\/?p=6116"},"modified":"2022-01-17T13:10:34","modified_gmt":"2022-01-17T12:10:34","slug":"participacion-de-alf-usal-en-el-rno2021-sesion-de-poster-2","status":"publish","type":"post","link":"https:\/\/laser.usal.es\/attostructura\/en\/2021\/11\/23\/participacion-de-alf-usal-en-el-rno2021-sesion-de-poster-2\/","title":{"rendered":"ALF-USAL PARTICIPATION IN RNO2021 – POSTER SESSION"},"content":{"rendered":"\t\t
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Several members of the Group of Applications Laser and Photonics (ALF – USAL) present the results of their research in the Poster Sessions organized during the XIII National Meeting of Optics (RNO 2021) that is taking place virtually from November 22 to 24 of 2021.<\/p>

The works presented are included below:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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All the details of the congress can be consulted on its website<\/strong><\/a>. You can also follow the event through the Twitter<\/strong><\/a> account of the XIII National Optics Meeting and the hashtag #RNO2021<\/strong><\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Structuring XUV Vector-Vortex Beams via High Harmonic Generation<\/em><\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Authors:<\/span>\u00a0Alba de las Heras<\/span><\/span><\/u>, <\/span>Alok Kumar Pandey<\/span>, Julio San Rom\u00e1n<\/span>, Javier Serrano<\/span>, Elsa Baynard<\/span>, <\/span>Guillaume Dovillaire<\/span>, Moana Pittman<\/span>, Charles G. Durfee<\/span>, Luis Plaja<\/span>, Sophie Kazamias<\/span>, <\/span>Olivier Guilbaud<\/span>, <\/span>y <\/span>Carlos Hern\u00e1ndez<\/span>–<\/span>Garc\u00eda<\/span><\/p>

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Abstract:<\/span> Structured light in the short-wavelength regime is emerging as a paramount tool to explore ultrafast spin and electronic dynamics. In this work, we demonstrate experimentally and theoretically the up-conversion of Vector-Vortex Beams (VVB) from the IR to the XUV regime, introducing a unique configuration of XUV coherent radiation spatially structured in its polarization and phase. The build-up of high-order harmonic generation driven by VVB is governed by the conservation of the Pancharatnam topological charge, which considers the intertwined spin and orbital angular momentum properties. The selection rule results in harmonic VVB with a high topological charge and smooth propagation dynamics.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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A\u00a0<\/em>new post-compression scheme:\u00a0nonlinear propagation in\u00a0multipass cells.<\/i><\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Authors:\u00a0<\/span>\u00a0<\/span>Victor Segundo-Staels,<\/span> Enrique Conejero Jarque y Julio San Roman1.\u00a0<\/span><\/p>

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Abstract:<\/span>\u00a0<\/span>The development of short, pulsed lasers has paved the way of new scientific disciplines such as the femtochemistry or the attoscience. There are several well-known schemes to generate extremely short pulses, such as the post-compression techniques. One of the most used post-compression methods consists of the spectral broadening of the pulse via its nonlinear propagation through a hollow-core capillary filled with a gas. The post-compressed pulse obtained, after passing a phase compensation stage, can reach the few- and even single-cycle regime.\u00a0<\/span><\/p>

We have developed a numerical model to study the nonlinear propagation of a laser pulse in an MPC. It is based on the standard Split-Step Fourier scheme in 4 dimensions, namely 3 cartesian coordinates plus the time dimension, as done by M. Hanna and co-workers7. As usual, the nonlinearities are processed in the space-time domain and linear effects in the frequency domain.\u00a0\u00a0<\/span>Our code is written in MATLAB, employing some recent storage functions that allow us to work with big amounts of data. Normally we use a resolution grid of 128x128x512x\ud835\udc4d points, where \ud835\udc4d is the propagation coordinate, which could be adjusted with adaptative steps based on the nonlinearity demands. With this precision we solve the propagation of tens of roundtrips in short amounts of time, which allows us to have bigger accuracy in transversal or temporal coordinates.\u00a0\u00a0<\/span>Currently, we are able to retrieve previous results from the literature of spectral broadening in MPCs. This will allow us to study the behaviour of MPCs in different scenarios and to study the role of other nonlinear terms that could be relevant in some situations.\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Generaci\u00f3n de arm\u00f3nicos de orden elevado en presencia de campos\u00a0magn\u00e9ticos ultraintensos.\u00a0<\/i><\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Authors:<\/span> Rodrigo Mart\u00edn<\/span>, Luis Plaja y Carlos Hern\u00e1ndez – Garc\u00eda.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Abstract:<\/span> El auge del estudio de haces de luz estructurados en los \u00faltimos a\u00f1os ha permitido demostrar nuevos esquemas en los procesos de interacci\u00f3n l\u00e1ser-materia. Un ejemplo son los haces de luz vectoriales con polarizaci\u00f3n azimutal, mostrando un campo magn\u00e9tico longitudinal oscilante a frecuencias \u00f3pticas. Estos campos magn\u00e9ticos pueden llegar a ser del orden de giga-Tesla para intensidades m\u00e1ximas del haz vectorial en el rango de 10\u00b2\u00b9 W\/cm\u00b2<\/span>. En este trabajo se ha estudiado c\u00f3mo estos campos magn\u00e9ticos pueden afectar al proceso de generaci\u00f3n de arm\u00f3nicos de orden elevado. \u00a0Hemos observado c\u00f3mo los espectros mejoran de manera notable tanto en eficiencia como en la frecuencia m\u00e1xima que puede llegar a generarse. Adem\u00e1s hemos dado una explicaci\u00f3n desde un punto de vista fundamental de la din\u00e1mica que sufre el electr\u00f3n durante su excursi\u00f3n por el continuo bajo el efecto del campo magn\u00e9tico. Por un lado, se produce una reestructuraci\u00f3n de los niveles del continuo de manera an\u00e1loga a un hilo cu\u00e1ntico, debido al confinamiento transversal del campo magn\u00e9tico. Por otro lado, la funci\u00f3n de onda del electr\u00f3n, tras la fotoionizaci\u00f3n, sufre de una din\u00e1mica de revivals<\/i> o sucesivas focalizaciones que permite entender el aumento de las eficiencias y las frecuencias m\u00e1ximas que pueden obtenerse. Este trabajo presenta un nuevo esquema de la interacci\u00f3n l\u00e1ser-materia con la nueva generaci\u00f3n de l\u00e1seres de petavatio actualmente en construcci\u00f3n.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Pressures gradients in the compression of\u00a0few-cycle pulses in gas filled hollow-core fibers.<\/i><\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Authors:<\/span>\u00a0Marina Fern\u00e1ndez\u00a0Galan<\/u>,\u00a0Julio San Rom\u00e1n y Enrique Conejero Jarque.\u00a0<\/p>

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Abstract:<\/span> Gas-filled hollow-core fibers (HCFs) have been extensively used for generating intense ultrashort laser pulses, which are now essential tools in disciplines such as ultrafast spectroscopy or attosecond science. In this work, we have studied the generation of few-cycle pulses in HCF compressors with non-uniform pressure along the fiber. Varying the gas pressure, both dispersion and nonlinearity can be easily tuned, yielding output pulses with extremely short durations and a clean temporal profile.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Caracterizaci\u00f3n espacio temporal de v\u00f3rtices \u00f3pticos ultracortos<\/i><\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Authors<\/span>: Miguel L\u00f3pez-Ripa, <\/u>\u00cd\u00f1igo Sola y Benjam\u00edn Alonso<\/p>

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Abstract:<\/span> Las t\u00e9cnicas de caracterizaci\u00f3n espaciotemporal de pulsos ultracortos han ganado gran importancia a lo largo de las \u00faltimas d\u00e9cadas. En este trabajo hemos implementado un sistema de caracterizaci\u00f3n espaciotemporal compacto y ultraestable basado en interferometr\u00eda por desplazamiento lateral en un montaje monol\u00edtico. Adem\u00e1s, lo hemos empleado para caracterizar v\u00f3rtices \u00f3pticos ultracortos generados usando l\u00e1minas nanoestructuradas, demostrando su viabilidad y abriendo la puerta a explorar y optimizar nuevos casos de inter\u00e9s en aplicaciones de \u00f3ptica ultrarr\u00e1pida.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":6319,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[385,398],"tags":[],"class_list":["post-6116","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-attostructura-en","category-events-and-congress"],"_links":{"self":[{"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/posts\/6116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/comments?post=6116"}],"version-history":[{"count":1,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/posts\/6116\/revisions"}],"predecessor-version":[{"id":6320,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/posts\/6116\/revisions\/6320"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/media\/6319"}],"wp:attachment":[{"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/media?parent=6116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/categories?post=6116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/laser.usal.es\/attostructura\/wp-json\/wp\/v2\/tags?post=6116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}