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Bulletin of the American Physical Society

Attosecond time delays near the photoionisation threshold of neon

Matteo Moioli, Kathryn R. Hamilton, H. Ahmadi, Dominik Ertel, Marvin Schmoll, Alexei N. Grum-Grzhimailo, Грызлова Елена Владимировна, Maria M. Popova, Maxim D. Kiselev, David Atri Schuller, Klaus Bartschat, Gavin Menning, R. Moshammer, Thomas Pfeifer, Claus Dieter Schröter, G. Sansone

Published Jun 3, 2021• 1 citation
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Coherent narrow-band extreme-ultraviolet (EUV) light is generated by a near-resonant four-wave mixing (FWM) process between attosecond pulse trains and near-infrared pulses in neon gas. The near-resonant FWM process involves one vacuum-ultraviolet (VUV) photon and two near-infrared (NIR) photons and produces new higher-energy frequency components corresponding to the ns/ndns/ndns/nd to ground-state (2s22p6)(2{s}^{2}2{p}^{6})(2s22p6) transitions in the neon atom. The EUV emission exhibits small angular divergence (2 mrad) and monotonically increasing intensity over a pressure range of 0.5--16 Torr, suggesting phase matching in the production of the narrow-bandwidth coherent EUV light. In addition, time-resolved scans of the NIR nonlinear mixing process reveal the detection of a persistent, ultrafast bound electronic wave packet based on a coherent superposition initiated by the VUV pulse in the neon atoms. This FWM process using attosecond pulses offers a means for both efficient narrow-band EUV source generation and time-resolved investigations of ultrafast dynamics.