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End date: 2024 × Start date: 2020 × DDC: 530 × Subject: Central wavelength × Subject: Pulse repetition rate ×

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    Relativistic-intensity near-single-cycle light waveforms at kHz repetition rate
    (London : Nature Publishing Group, 2020) Ouillé, Marie; Vernier, Aline; Böhle, Frederik; Bocoum, Maïmouna; Jullien, Aurélie; Lozano, Magali; Rousseau, Jean-Philippe; Cheng, Zhao; Gustas, Dominykas; Blumenstein, Andreas; Simon, Peter; Haessler, Stefan; Faure, Jérôme; Nagy, Tamas; Lopez-Martens, Rodrigo
    The development of ultra-intense and ultra-short light sources is currently a subject of intense research driven by the discovery of novel phenomena in the realm of relativistic optics, such as the production of ultrafast energetic particle and radiation beams for applications. It has been a long-standing challenge to unite two hitherto distinct classes of light sources: those achieving relativistic intensity and those with pulse durations approaching a single light cycle. While the former class traditionally involves large-scale amplification chains, the latter class places high demand on the spatiotemporal control of the electromagnetic laser field. Here, we present a light source producing waveform-controlled 1.5-cycle pulses with a 719 nm central wavelength that can be focused to relativistic intensity at a 1 kHz repetition rate based on nonlinear post-compression in a long hollow-core fiber. The unique capabilities of this source allow us to observe the first experimental indications of light waveform effects in laser wakefield acceleration of relativistic energy electrons. © 2020, The Author(s).
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    Sub-100 fs mode-locked Tm:CLTGG laser
    (Washington, DC : Soc., 2021) Wang, Li; Chen, Weidong; Pan, Zhongben; Loiko, Pavel; Bae, Ji Eun; Rotermund, Fabian; Mateos, Xavier; Griebner, Uwe; Petrov, Valentin
    We report on the first sub-100 fs mode-locked laser operation of a Tm3+-doped disordered calcium lithium tantalum gallium garnet (Tm:CLTGG) crystal. Soliton mode-locking was initiated and stabilized by a transmission-type single-walled carbon nanotube saturable absorber. Pulses as short as 69 fs were achieved at a central wavelength of 2010.4 nm with an average power of 28 mW at a pulse repetition rate of ∼87.7 MHz. In the sub-100 fs regime, the maximum average output power amounted to 103 mW.