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

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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Submitted on : Wednesday, June 17, 2015 - 4:33:05 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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