Auflistung nach Schlagwort "Laser beams"

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  • Comparison of LASER and LED illumination for fiber optic fringe projection 
    Matthias, Steffen; Kästner, Markus; Reithmeier, Eduard (Bellingham, Wash. : SPIE, 2016)
    The inspection of functional elements is a crucial part of modern production cycles. However, with higher integration of production machinery and products, the accessibility for measurement systems is more and more limited. ...
  • Construction of an optical test-bed for eLISA 
    Lieser, Maike; Fitzsimons, E.; Isleif, Katharina-Sophie; Killow, C.; Perreur-Lloyd, M.; Robertson, D.; Schuster, S.; Tröbs, Michael; Veith, S.; Ward, H.; Heinzel, Gerhard; Danzmann, Karsten (Bristol : Institute of Physics Publishing, 2016)
    In the planned eLISA mission a key part of the system is the optical bench that holds the interferometers for reading out the inter-spacecraft distance and the test mass position. We report on ongoing technology development ...
  • Doppler Cooling and Trapping on Forbidden Transitions 
    Binnewies, T.; Wilpers, G.; Sterr, U.; Riehle, F.; Helmcke, J.; Mehlstäubler, T.E.; Rasel, Ernst Maria; Ertmer, Wolfgang (American Physical Society, 2001)
    Ultracold atoms at temperatures close to the recoil limit have been achieved by extending Doppler cooling to forbidden transitions. A cloud of 40Ca atoms has been cooled and trapped to a temperature as low as 6μK by operating ...
  • Gravitational wave detectors 
    Aufmuth, Peter; Danzmann, Karsten (Bristol : Institute of Physics Publishing, 2005)
    The existence of gravitational radiation is a prediction of Einstein's general theory of relativity. Gravitational waves are perturbations in the curvature of spacetime caused by accelerated masses. Since the 1960s ...
  • Influence of the ultrasonic vibration amplitude on the melt pool dynamics and the weld shape of laser beam welded EN AW-6082 utilizing a new excitation system for laser beam welding 
    Ohrdes, H.; Nothdurft, S.; Nowroth, C.; Grajczak, J.; Twiefel, J.; Hermsdorf, J.; Kaierle, S.; Wallaschek, J. (Berlin : Springer, 2021)
    Laser beam welding is a commonly used technology for joining similar and dissimilar materials. In order to improve the mechanical properties of the weld, the introduction of ultrasonic vibration into the weld zone has been ...
  • Interferometer-Type Structures for Guided Atoms 
    Dumke, R.; Müther, T.; Volk, M.; Ertmer, Wolfgang; Birkl, G. (American Physical Society, 2002)
    We experimentally demonstrate interferometer-type guiding structures for neutral atoms based on dipole potentials created by microfabricated optical systems. As a central element we use an array of atom waveguides being ...
  • Investigation of the composite strength of hybrid steel-steel semi-finished products manufactured by laser beam welding and friction welding 
    Behrens, Bernd-Arno; Chugreev, A.; Matthias, T.; Nothdurft, S.; Hermsdorf, J.; Kaierle, Stefan; Ohrdes, H.; Twiefel, J.; Wallaschek, J.; Mildebrath, M.; Hassel, T. (Bristol : IOP Publishing Ltd., 2018)
    An ever-increasing demand for more effective products with lower weight, more compact design and extended functionality has led to the use of material combinations with locally adapted properties instead of mono-materials. ...
  • Investigations on laser beam welding of different dissimilar joints of steel and aluminum alloys for automotive lightweight construction 
    Seffer, Oliver; Pfeifer, Ronny; Springer, André; Kaierle, Stefan (Amsterdam : Elsevier B.V., 2016)
    Due to the enormous potential of weight saving, and the consequential reduction of pollutant emissions, the use of hybrid components made of steel and aluminum alloys is increasing steadily, especially concerning automotive ...
  • Laser cutting of CFRP with a fibre guided high power nanosecond laser source - Influence of the optical fibre diameter on quality and efficiency 
    Bluemel, S.; Bastick, S.; Staehr, R.; Jaeschke, P.; Suttmann, O.; Overmeyer, L. (Amsterdam : Elsevier B.V., 2016)
    For the development of a robot based laser cutting process of automotive 3D parts consisting of carbon fibre reinforced plastics (CFRP), investigations with a newly developed fibre guided nanosecond pulsed laser with an ...
  • Laser power stabilization via radiation pressure 
    Trad Nery, Marina; Venneberg, Jasper R.; Aggarwal, Nancy; Cole, Garrett D.; Corbitt, Thomas; Cripe, Jonathan; Lanza, Robert; Willke, Benno (Washington, DC : Soc., 2021)
    This Letter reports the experimental realization of a novel, to the best of our knowledge, active power stabilization scheme in which laser power fluctuations are sensed via the radiation pressure driven motion they induce ...
  • Line of sight calibration for the laser ranging interferometer on-board the GRACE follow-On mission: On-ground experimental validation 
    Koch, Alexander; Sanjuan, Josep; Gohlke, Martin; Mahrdt, Christoph; Brause, Nils Christopher; Braxmaier, Claus; Heinzel, Gerhard (Washington, DC : Optical Society of America, 2018)
    The laser ranging interferometer (LRI) on board of the GRACE follow-on spacecraft, launched in May 2018, is the first laser interferometer to perform an inter-satellite range measurement. It is designed for ranging noise ...
  • Low noise 400 W coherently combined single frequency laser beam for next generation gravitational wave detectors 
    Wellmann, Felix; Bode, Nina; Wessels, Peter; Overmeyer, Ludger; Neumann, Jörg; Willke, Benno; Kracht, Dietmar (Washington, DC : Optica, 2021)
    Design studies for the next generation of interferometric gravitational wave detectors propose the use of low-noise single-frequency high power laser sources at 1064 nm. Fiber amplifiers are a promising design option because ...
  • A low-power, low-noise 37-MHz photoreceiver for intersatellite laser interferometers using discrete heterojunction bipolar transistors 
    Barranco, German Fernandez; Sheard, Benjamin S.; Dahl, Christian; Mathis, Wolfgang; Heinzel, Gerhard (Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc., 2018)
    Intersatellite laser interferometers feature quadrant photoreceivers to produce electrical signals from the interfered optical beams. In the particular case of LISA, the expected optical AC beat note has an amplitude of ...
  • Modeling of photoluminescence in laser-based lighting systems 
    Chatzizyrli, Elisavet; Tinne, Nadine; Lachmayer, Roland; Neumann, Jörg; Kracht, Dietmar (Bellingham, Wash. : SPIE, 2017)
    The development of laser-based lighting systems has been the latest step towards a revolution in illumination technology brought about by solid-state lighting. Laser-activated remote phosphor systems produce white light ...
  • Neural sensing and control in a kilometer-scale gravitational-wave observatory 
    Mukund, N.; Lough, J.; Bisht, A.; Wittel, H.; Nadji, S.; Affeldt, C.; Bergamin, F.; Brinkmann, M.; Kringel, V.; Lück, H.; Weinert, M.; Danzmann, K. (College Park, Md. [u.a.] : American Physical Society, 2023)
    Suspended optics in gravitational-wave (GW) observatories are susceptible to alignment perturbations, particularly slow drifts over time, due to variations in temperature and seismic levels. Such misalignments affect the ...
  • Novel active driven drop tower facility for microgravity experiments investigating production technologies on the example of substrate-free additive manufacturing 
    Lotz, Christoph; Wessarges, Yvonne; Hermsdorf, Jörg; Ertmer, Wolfgang; Overmeyer, Ludger (London : Elsevier Ltd., 2018)
    Through the striving of humanity into space, new production processes and technologies for the use under microgravity will be essential in the future. Production of objects in space demands for new processes, like additive ...
  • Observation of phase fluctuations in elongated bose-einstein condensates 
    Dettmer, S.; Hellweg, D.; Ryytty, P.; Arlt, Jan J.; Ertmer, Wolfgang; Sengstock, K.; Petrov, D.S.; Shlyapnikov, G.V.; Kreutzmann, H.; Santos, Luis; Lewenstein, M. (American Physical Society, 2001)
    The occurrence of phase fluctuations due to thermal excitations in Bose-Einstein condensates (BECs) is studied for a variety of temperatures and trap geometries. We observe the statistical nature of the appearance of phase ...
  • Optimising process efficiency during remote laser cutting of CFRP by utilisation of a double-scan-head 
    Dittmar, Hagen; Herda, Patrick; Jäschke, Peter; Suttmann, Oliver; Overmeyer, Ludger (Amsterdam : Elsevier B.V., 2016)
    A double-scan-head was developed combining two pairs of galvo-mirrors into one device. One pair controls the laser beam's position, while the other in this setup is used for a pyrometer. Thus, a pyrometer's optical path ...
  • Opto-Thermal simulation model for optimizing laser-excited remote phosphor systems 
    Chatzizyrli, Elisavet; Tinne, Nadine; Lachmayer, Roland; Neumann, Jörg; Kracht, Dietmar (Bellingham, Wash. : SPIE, 2018)
    A new family of lighting products is developed as laser diodes replace LEDs in the remote phosphor configuration. The resulting lighting systems, also known as laser-excited remote phosphor systems, exhibit advanced ...
  • Picosecond laser filamentation in air 
    Schmitt-Sody, Andreas; Kurz, Heiko G.; Bergé, Luc; Skupin, Stefan; Polynkin, Pavel (Bristol : Institute of Physics Publishing, 2016)
    The propagation of intense picosecond laser pulses in air in the presence of strong nonlinear self-action effects and air ionization is investigated experimentally and numerically. The model used for numerical analysis is ...