Spatiotemporal coupling of attosecond pulses

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme UV range and bandwidths exceeding tens of electronvolts. They are often produced as a train of pulses separated by half the driving laser period, leading in the frequency domain to a spectrum of high, odd-order harmonics. As light pulses become shorter and more spectrally wide, the widely used approximation consisting of writing the optical waveform as a product of temporal and spatial amplitudes does not apply anymore. Here, we investigate the interplay of temporal and spatial properties of attosecond pulses. We show that the divergence and focus position of the generated harmonics often strongly depend on their frequency, leading to strong chromatic aberrations of the broadband attosecond pulses. Our argument uses a simple analytical model based on Gaussian optics, numerical propagation calculations, and experimental harmonic divergence measurements. This effect needs to be considered for future applications requiring highquality focusing while retaining the broadband/ultrashort characteristics of the radiation.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • ASML Netherlands B.V.
  • Louisiana State University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik

Nyckelord

Originalspråkengelska
Sidor (från-till)4779-4787
Antal sidor9
TidskriftProceedings of the National Academy of Sciences of the United States of America
Volym116
Utgivningsnummer11
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Hampus Wikmark, 2019 apr 23, Lund: Department of Physics, Lund University. 241 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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