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Quantum technologies

Dieter Meschede's research group
Home Group members Gautam Ramola
Group members
M. Sc. Gautam Ramola
Position: Master student
Field of research: Few-atom quantum systems
Institut für Angewandte Physik
Wegelerstr. 8
D-53115 Bonn
Office room: 213
Laboratory room: 207/208
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it.
Office: +49 228 73-3484
Laboratory: +49 228 73-3556


  • C. Robens, S. Brakhane, W. Alt, F. Kleißler, D. Meschede, G. Moon, G. Ramola and A. Alberti
    High numerical aperture (NA = 0.92) objective lens for imaging and addressing of cold atoms, Opt. Lett. 42, 1043 (2017)arXivBibTeXPDF

    We have designed, built, and characterized a high- resolution objective lens that is compatible with an ultra-high vacuum environment. The lens system ex- ploits the principle of the Weierstrass-sphere solid immersion lens to reach a numerical aperture (NA) of 0.92. Tailored to the requirements of optical lattice experiments, the objective lens features a relatively long working distance of 150 μm. Our two-lens design is remarkably insensitive to mechanical tolerances in spite of the large NA. Additionally, we demonstrate the application of a tapered optical fiber tip, as used in scanning near-field optical microscopy, to measure the point spread function of a high NA optical system. From the point spread function, we infer the wavefront aberration for the entire field of view of about 75 μm. Pushing the NA of an optical system to its ultimate limit enables novel applications in quantum technolo- gies such as quantum control of atoms in optical mi- crotraps with an unprecedented spatial resolution and photon collection efficiency.

  • G. Ramola
    A versatile digital frequency synthesizer for state-dependent transport of trapped neutral atoms, (2015), Master thesisBibTeXPDF

    This thesis deals with the design and construction of a versatile digital frequency synthesizer for implementation in the state-dependent transport of Cesium atoms. The versatile digital frequency synthesizer consists of a field programmable gate array interfaced with a low noise direct digital synthesizer that will be used for amplitude, phase and frequency modulation. The versatile digital frequency synthesizer provides better flexibility, for generating arbitrary waveforms, and lower phase noise than the previous setup. The measured reduction in phase noise of around 20dB corresponds to an increase in the lifetime of atoms by two orders of magnitude. This improved phase noise specification with the ability to generate arbitrary waveforms opens up possibilities for transporting atoms over macroscopic distances and eventually realizing an atom interferometer with a large space-time area.

Open projects