CEP-stable tunable THz-emission originating from laser-waveform-controlled sub-cycle plasma-electron bursts

T Balčiunas 1 D Lorenc 1 M Ivanov 2 O Smirnova 2 A Zheltikov 3 D Dietze 1 K Unterrainer 1 T Rathje 4 Gerhard Paulus 4 A. Baltuska 1 Stefan Haessler 1, 5
1 TU WIEN - Technical University of Vienna [Vienna]
2 MBI - Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
3 MSU - Lomonosov Moscow State University
4 Institute of optics and quantum electronics
5 LOA - Laboratoire d'optique appliquée
Abstract : We study THz-emission from a plasma driven by an incommensurate-frequency two-colour laser field. A semi-classical transient electron current model is derived from a fully quantum-mechanical description of the emission process in terms of sub-cycle field-ionization followed by continuum-continuum electron transitions. For the experiment, a CEP-locked laser and a near-degenerate optical parametric amplifier are used to produce two-colour pulses that consist of the fundamental and its near-half frequency. By choosing two incommensurate frequencies, the frequency of the CEP-stable THz-emission can be continuously tuned into the mid-IR range. This 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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https://hal-ensta-paris.archives-ouvertes.fr//hal-01164337
Contributor : Stefan Haessler <>
Submitted on : Wednesday, June 17, 2015 - 4:33:05 PM
Last modification on : Wednesday, September 4, 2019 - 5:36:02 PM
Long-term archiving on : Tuesday, September 15, 2015 - 3:17:38 PM

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T Balčiunas, D Lorenc, M Ivanov, O Smirnova, A Zheltikov, et al.. CEP-stable tunable THz-emission originating from laser-waveform-controlled sub-cycle plasma-electron bursts. Optics Express, Optical Society of America, 2015, 23, pp.15278. ⟨10.1364/OE.23.015278⟩. ⟨hal-01164337⟩

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