Browse Fakultät für Mathematik und Physik by Publication Type

Browse Fakultät für Mathematik und Physik by Publication Type

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  • 0.75 atoms improve the clock signal of 10,000 atoms 
    Kruse, I.; Lange, K.; Peise, J.; Lücke, Bernd; Pezzè, L.; Arlt, Jan J.; Ertmer, Wolfgang; Lisdat, C.; Santos, Luis; Smerzi, A.; Klempt, Carsten (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in ...
  • Accurate propagation of ultrashort pulses in nonlinear waveguides using propagation models for the analytic signal 
    Melchert, O.; Morgner, Uwe; Roth, B.; Babushkin, I.; Demircan, A. (Bellingham, WA : SPIE - International Society for Optical Engineering, 2018)
    We present a numerical approach for the accurate simulation of the complex propagation dynamics of ultrashort optical pulses in nonlinear waveguides, especially valid for few-cycle pulses. The propagation models are derived ...
  • Amplification of ultrafast pulses in an extended Mamyshev regenerator 
    Repgen, Paul; Wandt, Dieter; Morgner, Uwe; Neumann, Jörg; Kracht, Dietmar (Bellingham : SPIE, 2020)
    We present the characteristics of a high-energy ultrafast Yb-fiber laser system, based on a Mamyshev oscillator and a subsequently arranged fiber amplifier stage. The Mamyshev oscillator emits pulses at a repetition rate ...
  • Approaches toward optimized laser-induced damage thresholds of dispersive compensating mirrors applying nanolaminates 
    Willemsen, T.; Brinkmann, M.; Jupé, M.; Gyamfi, M.; Schlichting, S.; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    Ultra-short laser applications require high quality dielectric optics. The natural dispersion of light needs to be matched by dielectric components. However such dispersive components are very challenging for the deposition ...
  • Calibration accuracy of laser calorimetry for common crystal geometries 
    Willer, Yannick; Hao, Liu; Balasa, Istvan; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    An established method for precise determination of optical absorption is the so called laser calorimetry. According to ISO 115511 laser calorimetry is preferred to other photothermal test methods, because of its capability ...
  • Concept for high speed vocal cord imaging with swept-source optical coherence tomography 
    Zabic, Miroslav; Sharifpourboushehri, Sara; Müller-Wirts, Lennart; Benecke, Hannes; Heisterkamp, Alexander; Meyer, Heiko; Ripken, Tammo (Bellingham : SPIE, 2019)
    Optical coherence tomography (OCT) enables non-invasive depth-resolved investigation of laryngeal tissue. However, with conventional systems, OCT cross-sectional images of vibrating vocal cords always suffer from motion ...
  • Continuous detection of particles on a rotating substrate during thin film deposition 
    Rüsseler, Anna Karoline; Balasa, Istvan; Jensen, Lars; Ristau, Detlev (Bellingham : SPIE, 2018)
    Particles, which contaminate the substrate during thin film deposition, are prone to cause irremovable defects and demand special attention in the field of high precision laser optics as they can lead to localized absorption ...
  • CPA-free amplification of sub-10 ps pulses in Ho:YLF to the mJ-level at 2 μm wavelength 
    Hinkelmann, Moritz; Schulz, Bastian; Wandt, Dieter; Morgner, Uwe; Frede, Maik; Neumann, Jörg; Kracht, Dietmar (Bellingham : SPIE, 2019)
    The generation of sub-10 ps pulses around a wavelength of 2 μm with pulse energy at millijoule-level in a compact CPA-free amplifier chain is presented. This laser source covers a broad range of pulse repetition frequencies ...
  • Creating the first Bose-Einstein condensate in space 
    Lachmann, M.D.; Ahlers, H.; Becker, D.; Seidel, S.T.; Wendrich, T.; Rasel, Ernst Maria; Ertmer, Wolfgang; MAIUS-Team (Bellingham, WA : SPIE - International Society for Optical Engineering, 2018)
    On 23rd of January 2017 the first Bose-Einstein Condensate (BEC) in Space was created on-board the sounding rocket mission MAIUS-1. The successful launch marks a major advancement in the effort of performing matter wave ...
  • Determination of the laser-induced damage threshold of polymer optical fibers 
    Kiedrowski, K.; Thiem, J.; Jakobs, F.; Kielhorn, J.; Balasa, I.; Kracht, D.; Ristau, D. (Bellingham : SPIE, 2018)
    Investigating the properties of manufactured polymer optical fibers is essential to determine proper areas of application. Using pulsed laser radiation, especially with respect to laser activity in optical fibers, the ...
  • Direct in situ GDD measurement in optical coating process 
    Schlichting, S.; Willemsen, Thomas; Ehlers, H.; Morgner, Uwe; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2015)
    In the presented work a fast frequency domain measurement system to determine group delay (GD) and group delay dispersion (GDD) of optical coatings is proposed. The measurements are performed in situ directly on moving ...
  • Dynamic coherent beam combining based on a setup of microlens arrays 
    Prossotowicz, Maike; Heimes, Andreas; Flamm, Daniel; Jansen, Florian; Otto, Hans-Jürgen; Budnicki, Aleksander; Morgner, Uwe; Killi, Alexander (Bellingham : SPIE, 2020)
    A novel optical concept is introduced with standard components for highly efficient coherent beam combining a system of (N x N) beams. In a proof-of-principle experiment a well-defined setup with microlens arrays (MLAs) ...
  • Effective surface albedo due to snow cover of the surrounding area 
    Weihs, P.P.; Lenoble, J.; Blumthaler, M.; Seckmeyer, G.; Philipona, R.; De La Casiniere, A.; Sergent, C.; Martin, T.; Gröbner, J.; Cabot, T.; Masserot, D.; Schmucki, D.; Simic, S.; Rengarajan, G. (Bellingham Wash. : SPIE, 2002)
    Albedo inversion techniques are investigated in this work. Several methods are applied to spectral irradiance data from a measurement campaign held in the German Alps during the spring of 1999. One first method is based ...
  • Electronic quantization in dielectric nanolaminates 
    Willemsen, Thomas; Geerke, P.; Jupé, Marco; Gallais, L.; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2016)
    The scientific background in the field of the laser induced damage processes in optical coatings has been significantly extended during the last decades. Especially for the ultra-short pulse regime a clear correlation ...
  • Fabrication of polymer based integrated photonic devices by maskless lithography 
    Rahlves, Maik (Bellingham, WA : S P I E - International Society for Optical Engineering, 2016)
    We present our recent results on the fabrication of photonic devices such as single-mode and few-mode waveguides, Ycouplers as well as integrated interferometric sensor devices. The devices were created by means of a ...
  • FPGA based laser frequency stabilization using FM spectroscopy 
    Spindeldreier, Christian; Bartosch, Wolfgang; Wendrich, Thijs; Rasel, Ernst Maria; Ertmer, Wolfgang; Blume, Holger (Bellingham, Wash. : SPIE, 2018)
    Frequency stabilized light sources with narrow linewidth are mandatory for atom interferometry based experiments. For compact experiment designs used on space platforms, tunable DFB diode lasers are often used. These lasers ...
  • Fundamental frontiers of quantum science and technology 
    Arndt, Markus; Bassi, Angelo; Giulini, Domenico; Heidmann, Antoine; Raimond, Jean-Michel (Amsterdam [u.a.] : Elsevier, 2011)
    We discuss recent studies on the foundations of quantum physics with photonic, atomic, molecular and micromechanical systems as well as theoretical treatments of the interface between quantum physics and classical observations. ...
  • Generic off-diagonal solutions and jet deformations in modified and/or higher dimension gravity theories 
    Rajpoot, Subhash; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    Let g be a pseudo-Riemanian metric on a manifold V with conventional n+n dimensional splitting, n ≥ 2, for a nonholonomic (non-integrable) distribution N and consider a correspondingly adapted linear metric compatible ...
  • Geometric methods for constructing cosmological solutions for EYMH systems in two measure, f(R) and massive gravity theories 
    Rajpoot, Subhash; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    A brief summary of the anholonomic frame deformation method, AFDM, for generating exact solutions with generic off-diagonal metrics and generalized nonlinear connections in modified gravity theories, MGTs, is presented. ...
  • Gold nanoparticle-mediated laser stimulation causes a complex stress signal in neuronal cells 
    Johannsmeier, Sonja; Heeger, Patrick; Terakawa, Mitsuhiro; Kalies, Stefan; Heisterkamp, Alexander; Ripken, Tammo; Heinemann, Dag (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    Gold nanoparticle mediated laser stimulation of neuronal cells allows for cell activation on a single-cell level. It could therefore be considered an alternative to classical electric neurostimulation. The physiological ...

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