Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Interaction with strong or short laser pulses
A 21.4: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
In and ex situ characterization of few-cycle NIR laser pulses for strong-field quantum dynamics measurements—Three complementary methods compared — •Maximilian Hartmann1, Alexander Blättermann1, Huipeng Kang1,2, Paul Birk1, Veit Stooß1, and Thomas Pfeifer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
Strong few-cycle laser pulses are nowadays routinely generated by amplified Ti:sapphire lasers combined with spectral broadening in gas-filled hollow-core fibers and temporal compression by chirped–mirror compressors. They can be used to drive high–harmonic generation in gases in order to produce attosecond bursts of XUV radiation. Both XUV and NIR pulses can then be used to capture electron dynamics in atomic and molecular systems on their natural time scale.
To fully understand and optimize the experimental setup, and in order to compare experimental results and theoretical calculations quantitatively, characterization of the laser pulses is mandatory. Here, we compare three methods for the characterization of femtosecond NIR laser pulses. These methods comprise two ex situ techniques, namely the dispersion scan [Miranda et al., Opt. Express 20, 688-697 (2012)] and the interferometric autocorrelation. They are compared to an in situ optical scheme where the pulse properties are extracted from transient absorption spectra of XUV-excited atoms [Blättermann et al., Opt. Lett. 40, 3464-3467 (2015)].