Measurement of an Isolated 43-Attosecond Soft-X-Ray Pulse
Our group has recently reported the measurement of the shortest laser pulse ever created, a 43-attosecond pulse with a spectrum extending from 60 to 160 eV in photon energy.
The pulse was created through high-harmonic generation of an 11-fs mid-infrared laser pulse. Figure 1 shows the soft-X-ray spectra generated in argon and neon, together with their Fourier-limited durations.
The attosecond pulse duration was characterized by attosecond streaking using xenon as a target. Figure 2 shows the measured attosecond streaking spectrogram (panel A), compared to the reconstructed spectrogram (panel B) using our extension of the VTGPA algorithm to overlapping photoelectron spectra. This retrieval algorithm provides an attosecond pulse duration of 43 attoseconds (panel C) and a mid-IR pulse duration of 11 fs (panel D), in good agreement with an independent pulse measurement using transient-grating frequency-resolved optical gating (TG-FROG).
Original article:
T. Gaumnitz, A. Jain, Y. Pertot, M. Huppert, I. Jordan, F. Ardana-Lamas, and H. J. Wörner
DownloadStreaking of 43-attosecond soft-X-ray pulses generated by a passively CEP-stable mid-infrared driver (PDF, 5 MB)
Opt. Exp. 25, 27506 (2017)
doi: external page10.1364/OE.25.027506