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End date: 2024 × Start date: 2020 × DDC: 530 × Subject: Light sources ×

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Now showing 1 - 3 of 3
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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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    Real-time stimulated Raman spectroscopy with a non-collinear optical parametric oscillator
    (Washington, DC : Soc., 2021) Beichert, Luise; Binhammer, Yuliya; Andrade, José R. C.; Mevert, Robin; Kniggendorf, Ann-Kathrin; Roth, Bernhard; Morgner, Uwe
    Ultrafast detection of microplastic particles is becoming a vital problem, as these particles are found in water sources worldwide. Ideally, a live analysis in flow is desirable to directly monitor the water quality for contaminations. Therefore, coherent Raman spectroscopy techniques require fast and broadband tunable lasers to address all relevant spectral regions of the investigated samples. In our work, we combine a high power non-collinear optical parametric oscillator with a real-time stimulated Raman scattering spectroscopy setup. The light source is continously tunable from 700 nm to 1030 nm in less than 10 ms, delivering an average output power of more than 500 mW with sub-ps pulses. We show the immediate observation of mixing processes and the detection of microplastic particles in water solution with a spectral window of more than 2000 cm-1.
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    Absolute EUV reflectivity measurements using a broadband high-harmonic source and an in situ single exposure reference scheme
    (Washington, DC : Soc., 2022) Abel, Johann J.; Wiesner, Felix; Nathanael, Jan; Reinhard, Julius; Wünsche, Martin; Schmidl, Gabriele; Gawlik, Annett; Hübner, Uwe; Plentz, Jonathan; Rödel, Christian; Paulus, Gerhard G.; Fuchs, Silvio
    We present a tabletop setup for extreme ultraviolet (EUV) reflection spectroscopy in the spectral range from 40 to 100 eV by using high-harmonic radiation. The simultaneous measurements of reference and sample spectra with high energy resolution provide precise and robust absolute reflectivity measurements, even when operating with spectrally fluctuating EUV sources. The stability and sensitivity of EUV reflectivity measurements are crucial factors for many applications in attosecond science, EUV spectroscopy, and nano-scale tomography. We show that the accuracy and stability of our in situ referencing scheme are almost one order of magnitude better in comparison to subsequent reference measurements. We demonstrate the performance of the setup by reflective near-edge x-ray absorption fine structure measurements of the aluminum L2/3 absorption edge in α-Al2O3 and compare the results to synchrotron measurements.