• Sensitivity to new physics of isotope-shift studies using the coronal lines of highly charged calcium ions 

  Rehbehn, Nils-Holger; Rosner, Michael K.; Bekker, Hendrik; Berengut, Julian C.; Schmidt, Piet O.; King, Steven A.; Micke, Peter; Gu, Ming Feng; Müller, Robert; Surzhykov, Andrey; López-Urrutia, José R. Crespo (Woodbury, NY : Inst., 2021)

  Promising searches for new physics beyond the current standard model (SM) of particle physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical fifth force between the neutrons of the ...
• Comparing GRACE Follow-On Inter-Satellite Pointing Angles from Star Camera and LRI Fast Steering Mirror 

  Müller, Laura (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023-07-26)

  The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission is observing the time variable gravity field by measuring distance variations between two satellites. The first Laser Ranging Interferometer (LRI) ...
• Planar structures for two-color, single-beam magneto-optical traps 

  Bondza, Saskia (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  The exploration of quantum physics has heralded a new era of quantum sensors with improved measurement precision compared to conventional systems. Quantum sensors based on alkaline-earth atoms offer a particular high ...
• Setup and operation of a multi-ion clock based on linear In+/Yb+ crystals 

  Nordmann, Tabea (Hannover : Institutionelles Repositorium der Gottfried Wilhelm Leibniz Unviersität Hannover, 2023)

  Die aktuell genausten optischen Atomuhren basieren auf gefangenen und lasergekühlten Atomen oder Ionen. Dabei wird ein schmalbandiger Laser auf einen geeigneten elektronischen Übergang im Atom oder Ion stabilisiert und ...
• Using gravitational waves to study neutron stars in general relativity and alternative theories of gravity 

  Brown, Stephanie M. (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  LIGO's detection of gravitational waves emitted by a binary black hole merger in 2015 opened a new window into our universe. The era of multi-messenger astronomy began in 2017 with the detection of binary neutron star ...
• An optical clock based on a highly charged ion 

  Spieß, Lukas Josef (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  Optical clocks have demonstrated the lowest uncertainties among all experimental devices with applications in time keeping as well as for tests of fundamental physics. Their exceptional accuracy is realised by referencing ...
• All-fiber amplifier based on chirally-coupled-core fibers for gravitational wave detectors 

  Hochheim, Sven (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  Für die Entwicklung neuartiger Gravitationswellendetektoren auf Basis interferometrischer Messungen werden spezielle Hochleistungslaser benötigt. Die Designstudie für das europäische "Einstein Teleskop" offenbarte, dass ...
• Cryogenic silicon Fabry-Perot resonator with Al0.92Ga0.08As/GaAs mirror coatings 

  Yu, Jialiang (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  The sensitivity and stability of today's most precise optical interferometers, like gravitational wave detectors and ultra-stable lasers, are fundamentally limited by thermodynamically induced length fluctuations of ...
• Quantum metrology using tailored non-classical states 

  Junker, Jonas (Hannover : Institutionelles Repositorium der Leibniz Unversität Hannover, 2023)

  Squeezed states of light play a significant role in various technologies ranging from high-precision metrology such as gravitational wave detection to quantum information.These quantum states are prepared to carry particular ...
• An aluminum optical clock setup and its evaluation using Ca+ 

  Kramer, Johannes Albrecht (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  This thesis reports about the progress of the aluminum ion clock that is set up at the German National Metrological Institute, Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. All known relevant systematic ...
• Kinder auf den Weg bringen: eine qualitative Studie zur Bedeutung und Konturierung des Raums und der Lernbegleitung im Kontext von Lernwerkstattarbeit in Kindertageseinrichtungen 

  Hormann, Kathrin (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  Die vorliegende kumulative Dissertation stellt die Ergebnisse der qualitativen Studie zur Bedeutung und Konturierung des Raums und der Lernbegleitung im Kontext von Lernwerkstattarbeit in Kindertageseinrichtungen vor. ...
• Relativistic corrections and dynamic decoupling in trapped ion optical atomic clocks 

  Martínez Lahuerta, Víctor José (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  This thesis describes relativistic corrections and the use of dynamical decoupling in the context of trapped ion optical atomic clocks. The shifts that contribute to trapped ion optical atomic clocks can be divided into ...
• Quantum back-action evasion and filtering in optomechanical systems 

  Schweer, Jakob (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  The measurement precision of optomechanical sensors reached sensitivity levels such that they have to be described by quantum theory. In quantum mechanics, every measurement will introduce a back-action on the measured ...
• Large-Scale surveys for continuous gravitational waves: from data preparation to multi-stage hierarchical follow-ups 

  Steltner, Benjamin (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  The gravitational wave event GW150914 was the first direct detection of gravitational waves roughly 100 years after their prediction by Albert Einstein. The detection was a breakthrough, opening another channel to observe ...
• Machine learning applications in search algorithms for gravitational waves from compact binary mergers 

  Schäfer, Marlin Benedikt (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  Gravitational waves from compact binary mergers are now routinely observed by Earth-bound detectors. These observations enable exciting new science, as they have opened a new window to the Universe. However, extracting ...
• Robust artificial clock transition by continuous dynamical decoupling in multi-ion calcium crystals 

  Pelzer, Lennart (Hannover : Institutionelles Repositorium der Leibniz Unversität Hannover, 2023)

  Optical atomic clocks reach astonishingly low frequency uncertainties. Therefore, they are a valuable tool for applications even beside time determination. Predicted extensions of the standard model of particle physics can ...
• The LISA Three-Backlink experiment: ultra-stable optical bench construction and non-reciprocity investigation 

  Bischof, Lea (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

  The Laser Interferometer Space Antenna (LISA) will be a future gravitational wave observatory in space. It will consist of three spacecraft forming a triangular constellation using laser links. The angles of the constellation ...
• Single-Frequency EYDFA with polarization-maintaining fibers for gravitational wave detection 

  Booker, Phillip (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)

  In 2015, the space-time distortion caused by GW150914 was found - a pivotal event that inaugurated the era of interferometric gravitational wave astronomy. As of today, gravitational wave observations are routinely made ...
• Entangled momentum modes for atom interferometry 

  Anders, Fabian (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)

  Entangled ensembles have been created in versatile atomic systems and find a promising application in entanglement-enhanced metrology. Here, entangled spin-states have been successfully applied within interferometers ...
• Experimental investigations of fiber dynamics for the LISA backlink 

  Rohr, Johann Max (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)

  The LISA mission is a planned gravitational wave observatory in space that will use inter spacecraft laser links to measure their relative distance changes. In the current baseline implementation, each spacecraft will ...

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