H2020Индивидуална стипендия2020–2022

LADIE · Investigation of nonlinear stimulated emission in optically excited dielectrics

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-04-01 → 2022-03-31
Финансиране от ЕС: 207 312 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Диелектрични материали като стъклото при определени условия превръщат светлинния импулс в усилвател, например чрез излъчване на четири фотона при подадени два. Това помага за по-доброто разбиране на взаимодействието между светлината и материята и може да доведе до създаването на нови видове лазери.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Investigation of nonlinear stimulated emission in optically excited dielectrics

When a short laser pulse enters a dielectric material (i.e., an electrically insulating material like glass or water), the optical properties change rapidly. The short light pulse excites many electrons so that the material changes from being transparent to behaving almost like a metal – a so-called “plasma mirror”. It is well known that the material hereafter will reflect and absorb a second, subsequent laser pulse, which is often used to interrogate the dynamic properties of the material and to understand the fundamental physical processes at play. However, in this Marie Skłodowska Curie Action “Investigation of nonlinear stimulated emission in optically excited dielectrics (LADIE)”, the goal is to investigate the new and surprising discovery that – under the right circumstances – the “mirror” changes to an “amplifier” for the subsequent pulse. The amplification is due to multiphoton stimulated emission (e.g., two photons in – four photons out), a phenomenon which was predicted theoretically shortly after the invention of the laser, but which has so far been very difficult to observe experimentally. This new amplification process will have a strong impact on our understanding of light-matter interaction, new insights into materials, and which could eventually lead to completely new types of lasers. The main objective of this MSCA have been to understand the fundamental processes involved in multiphoton stimulated emission in excited dielectrics and to scope how they can be used to probe excited transparent materials. To that extent the development and construction of an experimental setup capable to precisely measure the linear and nonlinear optical response of excited dielectric materials stands in the centre of the action, accompanied by data evaluation and simulations. A parallel goal of the action is to foster the development of the individual researcher as well as realize his involvement in academic autonomy as well as teaching activities.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The nonlinear stimulated emission of ultraviolet light in a piece of optically excited – and thus metalized – glass that usually absorbs light is counterintuitive to what has been known for many decades about light-material interaction. However, this is exactly what was recently experimentally observed for the first time. Although a preliminary explanation and model describing the effect of laser amplification in excited dielectrics (LADIE) exists, a manifold of questions about fundamental processes like the universality, the potential of nonlinear light amplification and how giant-band-gap-renormalization in dielectrics works remain unanswered. In this project, a thorough investigation of the novel phenomenon and the associated rare nonlinear stimulated emission will be initiated. On the one hand, this study is based on femtosecond spectroscopy, deploying pump-probe experiments, utilizing light-conversion and pulse-shaping techniques that will be applied to a large variety of custom-made samples. On the other hand, the experimental studies will be complemented by advanced theoretical modelling of the material excitation that will be extended towards incorporating a proper description of the new mechanisms. The investigation of the LADIE effect will most likely open up an entirely new scientific field with many new surprises in store and the potential for novel derived applications. Its perspective is a revolution in laser technology, building high power nonlinear laser amplifiers in a huge variety of band-gap materials, which has a clear interdisciplinary aspect to semiconductor and optoelectronic research (i.e. telecommunication hardware), biophysics (cell surgery, nonlinear microscopy) and nonlinear optics in general.

Оригинален текст от CORDIS (на английски).

Участници

AARHUS UNIVERSITET · Aarhus CКоординаторДания