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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Los peines de frecuencia permiten una espectroscopia coherente multidimensional rápida y de alta resolución

Bachana Lomsadze1, Steven T Cundiff2

  • 1Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA, and JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, USA.

Science (New York, N.Y.)
|October 1, 2017
PubMed
Resumen

Los peines de doble frecuencia láser ahora miden espectros complejos. Esta nueva técnica no lineal multidimensional distingue los isótopos y los efectos de ampliación en las mezclas atómicas, superando las limitaciones de los métodos 1D.

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Área de la Ciencia:

  • Espectroscopia atómica
  • La óptica cuántica
  • Física del láser

Sus antecedentes:

  • La espectroscopia de absorción lineal con peines de doble frecuencia láser ofrece una alta resolución.
  • Las técnicas unidimensionales luchan para resolver analitos mixtos o mecanismos de ampliación separados.
  • Distinguir las características espectrales de diferentes isótopos o tipos de ampliación sigue siendo un desafío.

Objetivo del estudio:

  • Para superar las limitaciones de la espectroscopia lineal 1D para mezclas complejas.
  • Desarrollar un método para diferenciar y asignar resonancias espectrales de múltiples fuentes.
  • Separar los efectos de ampliación inhomogéneos y homogéneos en las muestras atómicas.

Principales métodos:

  • Adquisición de espectros coherentes multidimensionales de alta resolución mediante el uso de peines de frecuencia.
  • Aplicación experimental a una mezcla de isótopos de rubidio (87Rb y 85Rb).
  • Análisis de las características espectrales basadas en colocaciones de estados de energía hiperfinos.

Principales resultados:

  • Diferenciación exitosa de las características ampliadas por Doppler de 87Rb y 85Rb.
  • Asignación de contribuciones espectrales basadas en sus estructuras de nivel de energía hiperfina.
  • Demostración de la capacidad de la espectroscopia no lineal multidimensional para resolver superposiciones espectrales complejas.

Conclusiones:

  • La espectroscopia coherente no lineal multidimensional con peines de frecuencia supera los métodos lineales 1D para muestras complejas.
  • Esta técnica permite la diferenciación precisa y la asignación de las características espectrales en las mezclas.
  • El método proporciona una herramienta poderosa para el análisis de isótopos atómicos y la ampliación espectral.