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Atosegundo de la capa interna de láser en las longitudes de onda Ångström

Thomas M Linker1,2, Aliaksei Halavanau3, Thomas Kroll4

  • 1Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. tlinker@slac.stanford.edu.

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Resumen

Se observaron fuertes efectos de láser de rayos X no lineales, incluida la filamentación y el ciclo de Rabi, en cobre y manganeso utilizando láseres de electrones libres de rayos X (XFEL). Estos hallazgos abren nuevas vías para la generación de pulsos de rayos X en segundos y aplicaciones de óptica cuántica.

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Área de la Ciencia:

  • Óptica no lineal y ciencia de rayos X

Sus antecedentes:

  • Los efectos ópticos no lineales como la filamentación y el ciclo de Rabi están bien establecidos.
  • Los láseres de electrones libres de rayos X (XFEL) permiten técnicas de rayos X con alta resolución espacial y especificidad elemental.
  • El láser de rayos X Kα1 impulsado por XFEL se ha utilizado para la espectroscopia no lineal y el desarrollo de nuevas fuentes de rayos X.

Objetivo del estudio:

  • Investigar la aparición de efectos no lineales de tipo óptico en el láser de rayos X Kα1 impulsado por XFEL.
  • Explorar las características de los pulsos de rayos X generados en condiciones de alta intensidad.
  • Comprender los mecanismos detrás de las inhomogeneidades espaciales y las características espectrales en el láser de rayos X.

Principales métodos:

  • Observación experimental del láser Kα1 impulsado por XFEL en cobre y manganeso a altas intensidades (> 1019 W cm-2).
  • Análisis de las propiedades de los pulsos de rayos X, incluidas las inhomogeneidades espaciales y la división/ampliación espectral.
  • Cálculos tridimensionales de Maxwell-Bloch para simular e interpretar los fenómenos observados.

Principales resultados:

  • Demostración de fuertes efectos láser análogos a los regímenes ópticos en longitudes de onda de 1,5-2,1 Å.
  • Observación de inhomogeneidades espaciales significativas y división/ampliación espectral en los pulsos de rayos X generados.
  • Resultados de simulación que atribuyen inhomogeneidades espaciales a la filamentación de rayos X y características espectrales al ciclo de Rabi subfemtosecundo.

Conclusiones:

  • El láser Kα1 impulsado por XFEL de alta intensidad puede exhibir fenómenos complejos no lineales previamente vistos solo en el régimen óptico.
  • Los pulsos de rayos X generados pueden poseer duraciones de pulso de un attosegundo (<100 attosegundos) y propiedades de coherencia únicas.
  • Estos hallazgos presentan oportunidades para nuevas aplicaciones en óptica cuántica de rayos X.