Browsing by Subject "Frequency standards"

Sort by: Order: Results:

  • A strontium lattice clock with reduced blackbody radiation shift 
    Al-Masoudi, Ali Khalas Anfoos (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2016)
    [no abstract]
  • First international comparison of fountain primary frequency standards via a long distance optical fiber link 
    Guéna, J.; Weyers, S.; Abgrall, M.; Grebing, C.; Gerginov, V.; Rosenbusch, P.; Bize, Sebastien; Lipphardt, B.; Denker, H.; Quintin, N.; Raupach, S.M.F.; Nicolodi, D.; Stefani, F.; Chiodo, N.; Koke, S.; Kuhl, A.; Wiotte, F.; Meynadier, F.; Camisard, E.; Chardonnet, C.; Le Coq, Y.; Lours, M.; Santarelli, G.; Amy-Klein, A.; Le Targat, R.; Lopez, O.; Pottie, P.-E.; Grosche, G. (Bristol : Institute of Physics Publishing, 2017)
    We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNESYRTE (Laboratoire National de métrologie ...
  • Identification of the predicted 5s-4f level crossing optical lines with applications to metrology and searches for the variation of fundamental constants 
    Windberger, A.; Crespo López-Urrutia, J.R.; Bekker, H.; Oreshkina, N.S.; Berengut, J.C.; Bock, V.; Borschevsky, A.; Dzuba, V.A.; Eliav, E.; Harman, Z.; Kaldor, U.; Kaul, S.; Safronova, U.I.; Flambaum, V.V.; Keitel, C.H.; Schmidt, Piet O.; Ullrich, J.; Versolato, O.O. (College Park, MD : American Physical Society, 2015)
    We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions of particular interest for studies of a possibly varying fine-structure constant. Exploiting characteristic energy scalings we identify the strongest lines, ...
  • Mobile quantum gravity sensor with unprecedented stability 
    Freier, C.; Hauth ,M.; Schkolnik, V.; Leykauf, B.; Schilling, Manuel; Wziontek, H.; Scherneck, H.-G.; Müller, J.; Peters, A. (Bristol : Institute of Physics Publishing, 2016)
    Changes of surface gravity on Earth are of great interest in geodesy, earth sciences and natural resource exploration. They are indicative of Earth system's mass redistributions and vertical surface motion, and are usually ...
  • On-line estimation of local oscillator noise and optimisation of servo parameters in atomic clocks 
    Leroux, Ian D.; Scharnhorst, Nils; Hannig, Stephan; Kramer, Johannes; Pelzer, Lennart; Stepanova, Mariia; Schmidt, Piet O. (Bristol : Institute of Physics Publishing, 2017)
    For atomic frequency standards in which fluctuations of the local oscillator (LO) frequency are the dominant noise source, we examine the role of the the servo algorithm that predicts and corrects these frequency fluctuations. ...
  • Relativistic geodesy 
    Flury, Jakob (Bristol : Institute of Physics Publishing, 2016)
    Quantum metrology enables new applications in geodesy, including relativistic geodesy. The recent progress in optical atomic clocks and in long-distance frequency transfer by optical fiber together pave the way for using ...
  • Remote frequency measurement of the 1S 0→ 3P 1 transition in laser-cooled 24Mg 
    Friebe, J.; Riedmann, M.; Wübbena, T.; Pape, A.; Kelkar, H.; Ertmer, Wolfgang; Terra, O.; Sterr, Uwe; Weyers, S.; Grosche, G.; Schnatz, H.; Rasel, Ernst Maria (Bristol : IOP Publishing Ltd., 2011)
    We perform Ramsey-Bordé spectroscopy on laser-cooled magnesium atoms in free fall to measure the 1S 0→ 3P 1 intercombination transition frequency. The measured value of 655 659 923 839 730 (48) Hz is consistent with our ...