Now showing items 1-20 of 32

    • 2-μm wavelength, high-energy Ho:YLF chirped-pulse amplifier for mid-infrared OPCPA 

      Hemmer, M.; Sánchez, D.; Jelínek, M.; Smirnov, Vadim; Jelinkova, H.; Kubeček, V.; Biegert, Jens (OSA, 2015-02-02)
      Article
      Open Access
      A 2-μm wavelength laser delivering up to 39-mJ energy, ∼10 ps duration pulses at 100-Hz repetition rate is reported. The system relies on chirped pulse amplification (CPA): a modelocked Er:Tm:Ho fiber-seeder is followed ...
    • Attosecond core-level spectroscopy reveals the flow of excitation in a material between light, carriers and phonons 

      Sidiropoulos, Themistoklis P. H.; Palo, Nicola di; Rivas Barragan, Daniel; Severino, Stefano; Reduzzi, Maurizio; Nandy, Biplob; Bauerhenne, Bernd; Krylow, Sergej; Vasileiadis, Thomas; Biegert, Jens (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Conference report
      Open Access
      We use attosecond core-level X-ray spectroscopy to disentangle the spectral and dynamical signatures of energy conversion pathways between photons, charge carriers and the lattice in graphite with attosecond precision and ...
    • Attosecond pulse shaping using partial phase matching 

      Austin, Dane R.; Biegert, Jens (IOP, 2014-11-04)
      Article
      Open Access
    • Attosecond state-resolved carrier motion in quantum materials probed by soft x-ray XANES 

      Buades, Bárbara; Picón, Antonio; Berger, Emma; León, Iker; Palo, Nicola di; Cousin, Seth L.; Cocchi, Caterina; Pellegrin, Eric; Herrero Martin, Javier; Mañas-Valero, Samuel; Coronado, Eugenio; Danz, Thomas; Draxl, Claudia; Uemoto, Mitsuharu; Yabana, Kazuhiro; Schultze, Martin; Wall, Simon; Zürch, Michael; Biegert, Jens (AIP, 2021-03-10)
      Article
      Open Access
      Recent developments in attosecond technology led to table-top x-ray spectroscopy in the soft x-ray range, thus uniting the element- and state-specificity of core-level x-ray absorption spectroscopy with the time resolution ...
    • Broadband mid-IR frequency comb with CSP and AGS from a Er,Tm:Ho fiber laser 

      Sánchez, D.; Hemmer, M.; Baudisch, M.; Zawilski, Kevin T.; Schunemann, P.; Hoogland, H.; Holzwarth, R.; Biegert, Jens (OSA, 2014-12-15)
      Article
      Open Access
      We report on the generation of a 2500 nm bandwidth frequency comb at 6.5 μm central wavelength based on critically phase-matched parametric down-conversion in the nonlinear crystal CdSiP 2 CdSiP2 (CSP), driven by a ...
    • Few-cycle mid-infrared pulses from BaGa2GeSe6 

      Elu Etxano, Ugaitz; Steinle, Tobias; Biegert, Jens; Maidment, Luke (2020-07-01)
      Article
      Open Access
      BaGa2GeSe6 (BGGSe) is a newly developed nonlinear material that is attractive for ultrabroad frequency mixing and ultrashort pulse generation due to its comparably low dispersion and high damage threshold. A numerical study ...
    • High flux table-top soft X-ray source driven by sub-2-cycle, CEP stable, 1.85 μm 1 kHz pulses for carbon K-edge spectroscopy 

      Cousin, S. L.; Silva, F.; Teichmann, S.; Hemmer, M.; Buades, B.; Biegert, Jens (OSA, 2014-09-15)
      Article
      Open Access
      We report on the first table-top high flux source of coherent soft X-ray radiation up to 400 eV, operating at 1 kHz. This source covers the carbon K-edge with a beam brilliance of (4.3 ± 1.2) × 1015 photons/s/mm2/strad/10% ...
    • High power multi-color OPCPA source with simultaneous femtosecond deep-UV to mid-IR outputs 

      Baudisch, M.; Wolter, B.; Pullen, M.; Hemmer, M.; Biegert, Jens (OSA, 2016-08-01)
      Article
      Open Access
      Many experimental investigations demand synchronized pulses at various wavelengths, ideally with very short pulse duration and high repetition rate. Here we describe a femtosecond multi-color optical parametric chirped ...
    • High-power sub-two-cycle mid-infrared pulses at 100 MHz repetition rate 

      Pupeza, I.; Sánchez, D.; Zhang, J.; Lilienfein, N.; Seidel, M.; Karpowicz, N.; Paasch-Colberg, T.; Znakovskaya, I.; Pescher, M.; Schweinberger, W.; Pervak, V.; Fill, E.; Pronin, O.; Wei, Z.; Krausz, F.; Apolonski, A.; Biegert, Jens (Nature Publishing Group, 2015-09-21)
      Article
      Restricted access - publisher's policy
      Powerful coherent light with a spectrum spanning the mid-infrared (MIR) spectral range is crucial for a number of applications in natural as well as life sciences, but so far has only been available from large-scale ...
    • Imaging an aligned polyatomic molecule with laser-induced electron diffraction 

      Pullen, Michael G.; Wolter, Benjamin; Le, Anh-Thu; Baudisch, Matthias; Hemmer, Michaël; Senftleben, Arne; Schröter, Claus Dieter; Ullrich, Joachim; Moshammer, Robert; Lin, C. D.; Biegert, Jens (Nature Publishing Group, 2015-06-24)
      Article
      Open Access
      Laser-induced electron diffraction is an evolving tabletop method that aims to image ultrafast structural changes in gas-phase polyatomic molecules with sub-Ångstro¨m spatial and femtosecond temporal resolutions. Here ...
    • Imaging an isolated water molecule with an attosecond electron wave packet 

      Liu, Xinyao; Amini, Kasra; Steinle, Tobias; Sánchez, Aurelien; Moniruzzaman, Shaikh; Belsa Carné, Blanca Maria; Steinmetzer, Johannes; Anh-Thu, Le; Moshammer, Robert; Pfeifer, Thomas; Ullrich, Joachim; Moszynski, Robert; Lin, Chii-Dong; Gräfe, Stefanie; Biegert, Jens (Institute of Physics (IOP), 2020-01-01)
      Article
      Open Access
      We use laser-induced electron diffraction (LIED) to self-image the molecular structure of an isolated water molecular ion using its own retuning attosecond electron wave packet (EWP). Using LIED’s sub-femtosecond and ...
    • Kinematically complete measurements of strong eld ionisation with mid-IR pulses 

      Pullen, Michael G.; Dura, Judith; Wolter, Benjamin; Baudisch, Matthias; Hemmer, Michael; Camus, Nicolas; Senftleben, Arne; Schroeter, Claus Dieter; Moshammer, Robert; Ullrich, Joachim; Biegert, Jens (IOP, 2014-10-08)
      Article
      Open Access
      Recent observations of three unique peaks near 1 eV, 100 meV and 1 meV in the electron spectra generated by ionization using intense mid-IR pulses have challenged the current understanding of strong-field (SF) ionization. ...
    • Laser-induced electron diffraction of the ultrafast umbrella motion in ammonia 

      Belsa, B.; Amini, K.; Liu, X.; Sánchez, A.; Steinle, T.; Steinmetzer, J.; Le, A. T.; Moshammer, R.; Pfeifer, T.; Ullrich, J.; Moszynski, R.; Lin, C. D.; Grafe, S.; Biegert, Jens (AIP, 2021-01-13)
      Article
      Open Access
      Visualizing molecular transformations in real-time requires a structural retrieval method with Ångström spatial and femtosecond temporal atomic resolution. Imaging of hydrogen-containing molecules additionally requires an ...
    • Laser-induced electron diffraction of the ultrafast umbrella motion in ammonia 

      Belsa Carné, Blanca Maria; Amini, Kasra; Liu, Xinyao; Sánchez, Aurelien; Steinle, Tobias; Steinmetzer, Johannes; Biegert, Jens (AMER INST PHYSICS, 2021-01-13)
      Article
      Open Access
      Visualizing molecular transformations in real-time requires a structural retrieval method with Ångström spatial and femtosecond temporal atomic resolution. Imaging of hydrogen-containing molecules additionally requires an ...
    • Molecular Fine Structure from Water Window X-rays 

      Cousin, Seth L.; Silva, Francisco; Teichmann, Stephan; Hemmer, M.; Biegert, Jens (OSA, 2014-12-01)
      Article
      Open Access
    • Molecular structure retrieval directly from laboratory-frame photoelectron spectra in laser-induced electron diffraction 

      Sánchez, A.; Amini, K.; Wang, S.-J.; Steinle, T.; Belsa, B.; Danek, J.; Le, A. T.; Liu, X.; Moshammer, R.; Pfeifer, T.; Richter, M.; Ullrich, J.; Gräfe, S.; Lin, C. D.; Biegert, Jens (Nature Research, 2021-03-09)
      Article
      Open Access
      Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This ...
    • Molecular structure retrieval directly from laboratory-frame photoelectron spectra in laser-induced electron diffraction 

      Sánchez, Aurelien; Amini, Kasra; Belsa Carné, Blanca Maria; Liu, Xinyao; Steinle, Tobias; Biegert, Jens (2021-03-09)
      Article
      Open Access
      Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This ...
    • Performance of MgO:PPLN, KTA, and KNbO3 for mid-wave infrared broadband parametric amplification at high average power 

      Baudisch, M.; Hemmer, M.; Pires, H.; Biegert, Jens (OSA, 2014-10-15)
      Article
      Open Access
      The performance of KNbO3, MgO:PPLN and KTA were experimentally compared for broadband mid-wave infrared parametric amplification at high repetition rate. The seed pulses with an energy of 6.5 μJ were amplified using 410 ...
    • Role of high ponderomotive energy in laser-induced nonsequential double ionization 

      Shaaran, T.; Camus, N.; Dura, J.; Fechner, L.; Thai, A.; Britz, A.; Baudisch, M.; Steinle, T.; Senftleben, A.; Schröter, C. D.; Ullrich, J.; Pfeifer, T.; Keitel, C. H.; Biegert, Jens; Hatsagortsyan, K. Z.; Moshammer, R. (APS, 2019-02-19)
      Article
      Open Access
      The laser-induced nonsequential double ionization (NSDI) of rare gas atoms in the near and mid-IR laser fields is studied experimentally and theoretically. We investigate electron-electron correlation at high recollision ...
    • Seven-octave high-brightness and carrier-envelope-phase-stable light source 

      Elu Etxano, Ugaitz; Maidment, Luke; Vamos, Lenard; Badikov, Valeriy; Badikov, Dmitrii; Petrov, Valentin; Biegert, Jens (2021-04)
      Article
      Restricted access - publisher's policy
      High-brightness sources of coherent and few-cycle-duration light waveforms with spectral coverage from the ultraviolet to the terahertz would offer unprecedented versatility and opportunities for a wide range of applications ...