Browsing by Subject "Optical pumping"

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  • Compact 200 kHz HHG source driven by a few-cycle OPCPA 
    Harth, Anne; Guo, Chen; Cheng, Yu-Chen; Losquin, Arthur; Miranda, Miguel; Mikaelsson, Sara; Heyl, Christoph M.; Prochnow, Oliver; Ahrens, Jan; Morgner, Uwe; L'Huillier, Anne; Arnold, Cord L. (Bristol : Institute of Physics Publishing, 2018)
    We present efficient high-order harmonic generation (HHG) based on a high-repetition rate, few-cycle, near infrared (NIR), carrier-envelope phase stable, optical parametric chirped pulse amplifier (OPCPA), emitting 6 fs ...
  • High repetition rate, J-level, CPA-free ultrashort pulse multipass amplifier based on Ho:YLF 
    Hinkelmann, Moritz; Wandt, Dieter; Morgner, Uwe; Neumann, Jörg; Kracht, Dietmar (Washington, DC : Optical Society of America, 2018)
    We report on CPA-free multipass amplification of ps-pulses in Holmium-doped yttrium lithium fluoride (Ho:YLF) crystals up to µJ pulse-energy-covering repetition rates from 10 kHz up to 500 kHz. The seed pulses at a wavelength ...
  • High-order-harmonic generation from dense water microdroplets 
    Kurz, Heiko G.; Steingrube, Daniel S.; Ristau, Detlev; Lein, Manfred; Morgner, Uwe; Kovacev, Milutin (College Park, MD : American Physical Society, 2013)
    We report on high-order-harmonic generation from micrometer-sized liquid water droplets. In pump-probe experiments, the influence of the time delay onto the emission of harmonic radiation is systematically studied. ...
  • Low Temperature Relaxation of Donor Bound Electron Spins in Si 28: P 
    Sauter, E.; Abrosimov, N.V.; Hübner, J.; Oestreich, M. (College Park, Md. : APS, 2021)
    We measure the spin-lattice relaxation of donor bound electrons in ultrapure, isotopically enriched, phosphorus-doped Si28:P. The optical pump-probe experiments reveal at low temperatures extremely long spin relaxation ...
  • Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons 
    Lauth, Jannika; Failla, Michele; Klein, Eugen; Klinke, Christian; Kinge, Sachin; Siebbeles, Laurens D.A. (Cambridge : Royal Society of Chemistry, 2019)
    Solution-processable two-dimensional (2D) semiconductors with chemically tunable thickness and associated tunable band gaps are highly promising materials for ultrathin optoelectronics. Here, the properties of free charge ...
  • Simulating open quantum systems: From many-body interactions to stabilizer pumping 
    Müller, M.; Hammerer, Klemens; Zhou, Y.L.; Roos, C.F.; Zoller, P. (Bristol : IOP Publishing Ltd., 2011)
    In a recent experiment, Barreiro et al (2011 Nature 470 486) demonstrated the fundamental building blocks of an open-system quantum simulator with trapped ions. Using up to five ions, dynamics were realized by sequences ...
  • Symmetry Breaking and Strong Persistent Plasma Currents via Resonant Destabilization of Atoms 
    Brée, C.; Hofmann, M.; Demircan, A.; Morgner, Uwe; Kosareva, O.; Savel'Ev, A.; Husakou, A.; Ivanov, M.; Babushkin, I. (American Physical Society, 2017)
    The ionization rate of an atom in a strong optical field can be resonantly enhanced by the presence of long-living atomic levels (so-called Freeman resonances). This process is most prominent in the multiphoton ionization ...
  • Terahertz pulse generation by two-color laser fields with circular polarization 
    Tailliez, C.; Stathopulos, A.; Skupin, S.; Buožius, D.; Babushkin, I.; Vaičaitis, V.; Bergé, L. (Bristol : IOP Publishing Ltd., 2020)
    We study the influence of the polarization states of ionizing femtosecond two-color pulses on the emitted terahertz radiation in gases. A local-current model and plane-wave evaluations justify the previously-reported impact ...
  • Tunable in situ near-UV pulses by transient plasmonic resonance in nanocomposites 
    Husakou, Anton; Babushkin, Ihar; Fedotova, Olga; Rusetsky, Ryhor; Smirnova, Tatsiana; Khasanov, Oleg; Fedotov, Alexander; Sapaev, Usman; Apostolova, Tzveta (Washington, DC : Optica, 2023)
    We propose a concept for generation of ultrashort pulses based on transient field-induced plasmonic resonance in nanoparticle composites. Photoionization and free-carrier plasma generation change the susceptibility of ...
  • Ultrahigh bandwidth spin noise spectroscopy: Detection of large g-factor fluctuations in highly-n-doped GaAs 
    Berski, Fabian; Kuhn, Hendrik; Lonnemann, Jan G.; Hübner, Jens; Oestreich, Michael (College Park, MD : American Physical Society, 2013)
    We advance all optical spin noise spectroscopy (SNS) in semiconductors to detection bandwidths of several hundred gigahertz by employing a sophisticated scheme of pulse trains from ultrafast laser oscillators as an optical ...
  • Ultrashort pulse CPA-free Ho:YLF linear amplifier 
    Hinkelmann, Moritz; Wandt, Dieter; Morgner, Uwe; Neumann, Jörg; Kracht, Dietmar (Bellingham, WA : S P I E - International Society for Optical Engineering, 2018)
    We present CPA-free linear amplification of 6:3 ps pulses in Ho:YLF crystals up to 100 μJ pulse energy at 10 kHz repetition rate. The seed pulses at a wavelength of 2:05 μm are provided by a Ho-based all-fiber system ...