Browsing by Subject "Harmonic generation"

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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 ...
  • Determination of ionization and tunneling times in high-order harmonic generation 
    Zhao, Jing; Lein, Manfred (College Park, MD : American Physical Society, 2013)
    From the numerical solution of the time-dependent Schrödinger equation, we obtain the times of ionization and return of the laser-driven electron in high-order harmonic generation by probing the dynamics with a second ...
  • Dynamics of Dark Solitons in Elongated Bose-Einstein Condensates 
    Muryshev, A.; Shlyapnikov, G.V.; Ertmer, Wolfgang; Sengstock, K.; Lewenstein, M. (American Physical Society, 2002)
    We find two types of moving dark soliton textures in elongated condensates: nonstationary kinks and proper dark solitons. The latter have a flat notch region and we obtain the diagram of their dynamical stability. At finite ...
  • Emission times in high-order harmonic generation 
    Chirilä, C.C.; Dreissigacker, Ingo; van der Zwan, Elmar V.; Lein, Manfred (College Park, MD : American Physical Society, 2010)
    We calculate the emission times of the radiation in high-order harmonic generation using the Gabor transform of numerical data obtained from solving the time-dependent Schrödinger equation in one, two, and three dimensions. ...
  • Enabling second harmonic generation as a contrast mechanism for optical projection tomography (OPT) and scanning laser optical tomography (SLOT) 
    Nolte, Lena; Antonopoulos, Georgios C.; Rämisch, Lisa; Heisterkamp, Alexander; Ripken, Tammo; Meyer, Heiko (Washington, DC : Optical Society of America, 2018)
    Volumetric imaging of connective tissue provides insights into the structure of biological tissue. Second harmonic generation (SHG) microscopy has become a standard method to image collagen rich tissue like skin or cornea. ...
  • Extreme-ultraviolet frequency combs from high-order harmonic generation with few-cycle pulse trains 
    Tudorovskaya, Maria; Lein, Manfred (College Park, MD : American Physical Society, 2017)
    The spectrum of a high-repetition train of laser pulses consists of many equally spaced lines, forming an optical frequency comb which is useful for high-precision spectroscopy. By exposing atoms to a train of strong pulses, ...
  • High-order harmonic generation in the presence of a resonance 
    Tudorovskaya, Maria; Lein, Manfred (College Park, MD : American Physical Society, 2011)
    We investigate high-order harmonic generation from laser-irradiated systems that support a shape resonance. From the numerical solution of the time-dependent Schrödinger equation, we calculate the harmonic spectra and the ...
  • 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. ...
  • A highly stable monolithic enhancement cavity for second harmonic generation in the ultraviolet 
    Hannig, S.; Mielke, J.; Fenske, J.A.; Misera, M.; Beev, N.; Ospelkaus, C.; Schmidt, Piet O. (College Park, MD : American Institute of Physics, 2018)
    We present a highly stable bow-tie power enhancement cavity for critical second harmonic generation (SHG) into the UV using a Brewster-cut β-BaB2O4 (BBO) nonlinear crystal. The cavity geometry is suitable for all UV ...
  • Investigating the origin of third harmonic generation from diabolo optical antennas 
    Shi, Liping; Andrade, Jose R.C.; Kim, Hyunwoong; Han, Seunghwoi; Nicolas, Rana; Franz, Dominik; Boutu, Willem; Heidenblut, Torsten; Segerink, Frans B.; Bastiaens, Bert; Merdji, Hamed; Kim, Seung-Woo; Morgner, Uwe; Kovačev, Milutin (American Institute of Physics Inc., 2017)
    We propose to use diabolo nanoantennas for experimentally investigating the origin of the enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, the opposing apexes of bowties are ...
  • Investigation of second harmonic generation and multispectral imaging as new contrast mechanisms in scanning laser optical tomography 
    Nolte, Lena; Antonopoulos, Georgios C.; Heisterkamp, Alexander; Ripken, Tammo; Meyer, Heiko (Bellingham, WA : S P I E - International Society for Optical Engineering, 2018)
    Scanning laser optical tomography (SLOT) is a 3D imaging technique, based on the principle of computed tomography to visualize samples up to magnitude of several centimeters. Intrinsic contrast mechanisms as absorption, ...
  • Molecular imaging using high-order harmonic generation and above-threshold ionization 
    van der Zwan, Elmar V.; Lein, Manfred (College Park, MD : American Physical Society, 2012)
    Accurate molecular imaging via high-order harmonic generation relies on comparing harmonic emission from a laser-irradiated molecule and an adequate reference system. However, an ideal reference atom with the same ionization ...
  • Numerical analysis of LG3,3 second harmonic generation in comparison to the LG0,0 case 
    Heinze, Joscha; Vahlbruch, Henning; Willke, Benno (Washington, DC : OSA - The Optical Society, 2020)
    For coating Brownian thermal noise reduction in future gravitational wave detectors, it is proposed to use light in the helical Laguerre-Gaussian LG3,3 mode instead of the currently used LG0,0 mode. However, the simultaneous ...
  • Phase-stabilized UV light at 267 nm through twofold second harmonic generation 
    Kraus, B.; Dawel, F.; Hannig, S.; Kramer, J.; Nauk, C.; Schmidt, P.O. (Washington, DC : Optica, 2022)
    Providing phase stable laser light is important to extend the interrogation time of optical clocks towards many seconds and thus achieve small statistical uncertainties. We report a laser system providing more than 50 µW ...
  • Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime 
    Henkel, Jost; Witting, Tobias; Fabris, Davide; Lein, Manfred; Knight, Peter L.; Tisch, John W.G.; Marangos, Jonathan P. (College Park, MD : American Physical Society, 2013)
    Attosecond light pulses within the vacuum ultraviolet (VUV) energy range are predicted by solving the time-dependent Schrödinger equation (TDSE) for a model neon atom in short laser pulses of different field polarization ...
  • Synchronized beamline at FLASH2 based on high-order harmonic generation for two-color dynamics studies 
    Appi, E.; Papadopoulou, C.C.; Mapa, J.L.; Jusko, C.; Mosel, P.; Schoenberg, A.; Stock, J.; Feigl, T.; Ališauskas, S.; Lang, T.; Heyl, C.M.; Manschwetus, B.; Brachmanski, M.; Braune, M.; Lindenblatt, H.; Trost, F.; Meister, S.; Schoch, P.; Trabattoni, A.; Calegari, F.; Treusch, R.; Moshammer, R.; Hartl, I.; Morgner, U.; Kovacev, M. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2021)
    We present the design, integration, and operation of the novel vacuum ultraviolet (VUV) beamline installed at the free-electron laser (FEL) FLASH. The VUV source is based on high-order harmonic generation (HHG) in gas and ...
  • Two-center interference and ellipticity in high-order harmonic generation from H2+ 
    van der Zwan, Elmar V.; Lein, Manfred (College Park, MD : American Physical Society, 2010)
    We present a theoretical investigation into the two-center interference in aligned H2+. The influence of the laser field on the recombination step is investigated by comparing laser-induced harmonic generation with harmonic ...
  • Vibrational-state and isotope dependence of high-order harmonic generation in water molecules 
    Falge, Mirjam; Engel, Volker; Lein, Manfred (College Park, MD : American Physical Society, 2010)
    We report calculations on high-order harmonic generation in water molecules. Spectra are determined for various initial vibrational states of H2O and its isotope D2O. It is demonstrated that the ratio of the spectra for ...