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Óptica no lineal en el ultravioleta extremo.

Taro Sekikawa1, Atsushi Kosuge, Teruto Kanai

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan.

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|December 4, 2004
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Resumen

Los investigadores generaron pulsos intensos y aislados de ultravioleta extrema (XUV) utilizando un nuevo método óptico no lineal. Este avance permite nuevas aplicaciones en la ciencia del attosegundo y la óptica no lineal de rayos X.

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Área de la Ciencia:

  • La óptica no lineal es la óptica no lineal.
  • En segundo lugar la ciencia.
  • generación de rayos ultravioleta extremos (XUV).

Sus antecedentes:

  • Las respuestas ópticas no lineales son universales, pero son difíciles de observar en las regiones de rayos XUV / rayos X blandos debido a las limitadas fuentes de luz coherentes.
  • La generación de armonías altas (HHG) es crucial para la generación de pulsos de un segundo, que requieren una alta energía de pulso y duradas cortas para campos eléctricos ópticos fuertes.

Objetivo del estudio:

  • Para demostrar la generación de intensos pulsos XUV aislados en un orden armónico específico.
  • Para caracterizar estos pulsos ultracortos XUV utilizando una nueva técnica de autocorrelación.

Principales métodos:

  • Generación de intensos pulsos aislados a 27.9 eV (nono orden armónico) utilizando pulsos de láser azul de menos de 10 femtosegundos.
  • Caracterización de las duraciones de los pulsos XUV (950 attosegundos y 1,3 femtosegundos) a través de la ionización de helio de dos fotones por encima del umbral.

Principales resultados:

  • Generación exitosa de intensos pulsos aislados XUV de un solo armónico.
  • Demostración de la caracterización de la duración del pulso en un segundo en la región XUV utilizando ionización de helio.

Conclusiones:

  • La técnica desarrollada permite la generación y caracterización de intensos pulsos ultracortos XUV.
  • Este método se puede extender para caracterizar armónicos más altos en longitudes de onda más cortas, avanzando la óptica de rayos X no lineal.