Journal ArticleDOI
Optical detection of tunneling ionization.
Aart J. Verhoef,Alexander Mitrofanov,Evgenii E. Serebryannikov,Daniil Kartashov,Aleksei M. Zheltikov,Andrius Baltuška +5 more
TLDR
Optical harmonics that are generated due to a tunneling-ionization-induced modulation of the electron density are detected and can be isolated from concomitant optical responses by using a noncollinear pump-probe setup.Abstract:
We have experimentally detected optical harmonics that are generated due to a tunneling-ionization-induced modulation of the electron density. The optical signature of electron tunneling can be isolated from concomitant optical responses by using a noncollinear pump-probe setup. Whereas previously demonstrated tools for attosecond metrology of gases, plasmas, and surfaces rely on direct detection of charged particles, detection of the background-free time-resolved optical signal, which uniquely originates from electron tunneling, offers an interesting alternative that is especially suited for systems in which free electrons cannot be directly measured.read more
Citations
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Journal ArticleDOI
Tailoring terahertz radiation by controlling tunnel photoionization events in gases
Ihar Babushkin,Stefan Skupin,Anton Husakou,Christian Kohler,E. Cabrera-Granado,Luc Bergé,Joachim Herrmann +6 more
TL;DR: In this article, the spectral shape of the terahertz (THz) pulses generated by this mechanism is determined by the superposition of contributions from individual ionization events, which provides a straightforward analogy to linear diffraction theory, where the ionisation events play the role of slits in a grating.
Journal ArticleDOI
0.42 TW 2-cycle pulses at 1.8 μm via hollow-core fiber compression
TL;DR: By employing pulse compression with a stretched hollow core fiber, this paper generated 2-cycle pulses at 1.8 μm (12 fs) carrying 5 mJ of pulse energy at 100 Hz repetition rate.
Journal ArticleDOI
Tailoring THz radiation by controlling tunnel photoionization events in gases
Ihar Babushkin,Stefan Skupin,Anton Husakou,Christian Kohler,E. Cabrera-Granado,Luc Bergé,Joachim Herrmann +6 more
TL;DR: In this paper, the spectral shape of the terahertz (THz) pulses generated by focusing two-color laser pulses into a gas is determined by superposition of contributions from individual ionization events.
Journal ArticleDOI
Origin of strong-field-induced low-order harmonic generation in amorphous quartz
P. Jürgens,Benjamin Liewehr,B. Kruse,Christian Peltz,Dieter Engel,Anton Husakou,Tobias Witting,Misha Ivanov,Marc J. J. Vrakking,Thomas Fennel,Alexandre Mermillod-Blondin +10 more
TL;DR: In this article, strong field-induced nonlinearities from the injection of electrons into the conduction band contribute to harmonic generation in amorphous quartz close to the damage threshold, they dominate over intraband and interband contributions.
Journal ArticleDOI
CEP-stable Tunable THz-Emission Originating from Laser-Waveform-Controlled Sub-Cycle Plasma-Electron Bursts
T. Balčiūnas,D. Lorenc,Misha Ivanov,Olga Smirnova,Aleksei M. Zheltikov,D. Dietze,J. Darmo,Karl Unterrainer,T. Rathje,Gerhard G. Paulus,Andrius Baltuška,Stefan Haessler +11 more
TL;DR: The measured frequency dependence of the THz-emission is found to be consistent with the semi-classical transient electron current model, similar to the Brunel mechanism of harmonic generation.
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