Poster

PUBDB-2024-01773

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Cut-Off Extension of High-Harmonic Generation in Neon by Non-Sinusoidal Sub-Cycle Optical Waveforms

Rossi, G. M. (Corresponding author)CFEL*Extern*DESY* ; Scheiba, F.CFEL*Extern* ; Silva Toledo, M. A.CFEL*Extern* ; Mainz, R. E.CFEL*Extern* ; Kubullek, M.CFEL*DESY* ; rafael, g. ; Kärtner, F.CFEL*XFEL.EU*DESY*

2024

Abstract: Extending the spectrum of attosecond pulses obtained via high-harmonic generation toward higher photon-energies is an important goal for attosecond spectroscopy.An extension of the cut-off photon energy of the high-harmonic spectrum is observed when the process is driven by non-sinusoidal waveforms with durations down to belowa single optical cycle. Specifically, while the phase-matched high-harmonic spectra generated in Neon by a "sinusoidal" pulse, with a wavelength of 1.6 μm and durationof 1.5 optical cycles, extends up to ~350 eV, the spectra driven by a non-sinusoidal pulse, with a central wavelength of 1.4 μm and duration down to 0.5 optical cycles,extends up to ~400 eV.This shows experimentally how non-sinusoidal sub-cycle waveforms violate the well known proportionality of the cut-off photon energy with the square of the central wavelength.

---

Contributing Institute(s):

1. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2024

---