Master – Thesis

Design and construction of a Spin-Flip Zeeman slower for cooling Lithium-6

  • Task: Simulate, plan and build a Spin-Flip Zeeman slower to cool down a hot beam of atomic lithium-6. Before we can capture atoms in a magneto-optical trap they must be slowed down and cooled. A Spin-Flip Zeeman slower can efficiently slow down atoms from several hundreds m/s to almost 0. An optimal field configuration for lithium-6 has to be found, the magnets and their respective cooling system have to be built and subsequently the cooled atom beam has to be analyzed.
  • Field of Study: lasers, optics, electronics, magnets
  • Contact: Marcel Willig (marcel.willig[a]

Implementation of a digital servo for feedback control of our laser systems

  • Task: Frequency stabilization of external cavity diode lasers is very important in atomic physics, where laser line-widths of less than a MHz are required. The goal of this project is to set up and implement a FPGA based digital lock-box in our current control system.
  • Fields of study: diode lasers, precision spectroscopy, PID-controllers, electronics, coding (C++)
  • Contact: Marcel Willig (mwillig[a]

(High-field) absorption imaging of ultra-cold lithium atoms

  • Task: Determination of the ion number, size and ion number density of ultra-cold atoms are nowadays a versatile tool to determine the properties of ultra-cold atoms confined in a magneto-optical trap. The standard technique relies on the imaging of the atoms by absorption spectroscopy and imaging the shadow of an atom cloud on a CCD-camera.
    We are looking for a highly motivated student to set up this method in our apparatus.
  • Fields of study: diode lasers, coding (MATLAB, Python or C++), optics, image and data analysis
  • Contact: Marcel Willig (mwillig[a]

Fiber noise cancellation for frequency measurement with a frequency comb

  • Task: For our high-precision measurements on a Lithium 3D MOT, we have to transport our laser beam over hundreds of meters to a frequency comb using an optical fiber. This creates phase noise, which makes high-precision measurement of the laser frequency impossible. The aim of this work is to develop a system that suppresses this noise and thus ensures a stable transport of light.
  • Fields of study: diode lasers, optical fibers, acusto-optic modulators, optics, electronics,
  • Contact: Gregor Schwendler (grschwen[a]

Building a laser system for a Lithium-MOT @ T-Rex

  • Task: Setting up and characterizing a Lasersystem to be used for a Zeeman-Slower beam and a Li-MOT. The MOT will be used as a buffer gas in the Hydrogen/Tritium-experiment
  • Fields of study: diode lasers, optics, light/matter interaction
  • Contact: Jan Haack (jahaack[a]

Permanent Magnet System for Li-MOT /Hydrogen-Trap @ T-Rex

  • Task: Designing, Building and Measuring a permanent magnet configuration for a Li-MOT and as Hydrogen trap
  • Fields of study: permanent magnets, Halbach-arrays, MOTs, hyperfine levels, Zeeman-levels
  • Contact: Jan Haack (jahaack[a]

Particle Track Simulation of Hydrogen in magnetic field configuration  @ T-Rex

  • Task: writing a tracking simulation built on existing codes and evaluation
  • Field of Study: magnetic fields, atom/b-field interaction, light/matter interaction
  • Contact: Jan Haack (jahaack[a]

Quenching Stage and Lyman-Alpha detector

  • Task: set-up a quenching stage and a subsequent detector for 121nm light
  • Field of Study: detector physics, atomic physics
  • Contact: Jan Haack (jahaack[a]
Hydrogen Discharge @ T-Rex

If you have an own idea for a project in mind that you would like to do in our group, please feel free to contact us.